[Elecraft] XV432 transverter note

[chetsubaccount]

Hello fellow owners,

I am posting this here in case it may help others solve some issues they
have.

The past weekend contest presented a good opportunity to test a recent
modification to my Elecraft XV432 transverter.

In the last contest I noticed that its frequency stability was not
sufficient for dependable FT-8 operation. As it went thru transmit cycles,
the received signals on the waterfall would slowly arc over on a curved
trajectory. It took about 15 minutes of operation to settle down

I theorized that the high FT-8 duty cycle raised its internal temperature
faster than its local oscillator crystal oven could compensate. The little
fan inside simply spread the heat from the PA around to the whole unit. 

In a separate box I rigged a freq synthesizer (from Q5, having a nice TCXO)
set to produce the required LO frequency. The LO in the transverter was
disabled with a jumper from its transistor's base to ground. A BNC connector
added to the side of the transverter near the internal LO circuit allowed
for a small capacitor to then couple in the synthesized signal, and LO
levels and alinement were similar to the original.

It worked well! Now I get quick answers to my FT-8 transmissions. And, it is
interesting to watch other's signals on the waterfall- some are obviously
stable with a vertical series of transmissions, but others have curving
trajectories, often seen when they would first start up on the band, and
those stations were often difficult or impossible to contact as their
frequency moved.

My XV144 and XV222 transverters do not seem to suffer the same problem but
will get a closer look in the future.

73,
Chet, N8RA

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Re: [Elecraft] XV432

[K7MDL]

Due to station changes I have a stack of 5 Elecraft transverters sitting
idle.  (There are still 3 others in use!). 50, 2x 144, 222, and 432.  All
but the 50MHz one are converted to use external LO.  They are easily
switched back to the internal LO if desired by soldering back a few
connection/parts.

They are available for sale now.  Cannot ship for a few weeks due to travel
schedule.

Mike - K7MDL
El87sm/CN88sf



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Re: [Elecraft] XV432

[K7MDL]

I have used it for JT65 and FT8 but you have to run it at low output to
minimize drift from heating.  Even with the oven option it will drift as it
heats up. 

I eventually changed my entire stack(144,222,43,902,1296) all to an external
shared programmable LO, and that was connected to a 10MHz OCXO or GPSDO.  No
drift here!  

I have 7 Elecraft transverters between 2 QTHs, plus others for 902/1296, all
but the one 50Mhz box are converted to external LO.

Mike - K7MDL
EL87sm/CN88sf






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[Elecraft] XV432

[Ken Roberson via Elecraft]

Hello all,

Is the XV432 stable enough for EME digi modes?

Thanks agn 73 Ken K5DNL

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Re: [Elecraft] XV432

[David Pratt]

I would like to thank Don, Mike and Peter for responding to my plea for 
help for an XV transverter crystal oven.


I never cease to be amazed at the help given on the Elecraft reflector 
which is second to none.  Thank you gentlemen.


73 de David G4DMP

In a recent message, David Pratt  writes

I am wishing to buy an XV432 transverter for use with my K2.  If anyone
has one which they no longer need, I would be pleased to hear from them.

73 de David G4DMP


--
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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[Elecraft] XV432

[David Pratt]

I am wishing to buy an XV432 transverter for use with my K2.  If anyone
has one which they no longer need, I would be pleased to hear from them.

73 de David G4DMP

-- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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Re: [Elecraft] XV432 deaf

[Don Wilhelm]

Raj,

I have not measured the gain of the ATF stage by itself.  That is 
difficult to do because the measurement probe can induce and pick up 
stray coupling at VHF/UHF frequencies.


I normally judged the overall performance of the XVseries transverters 
by injecting a -140 dBm signal (controlled so there is little leakage) 
with a connected receiver.  I expected the receiver response of that 
combination to show a 20 dB or greater audio signal above the receiver 
noise floor.

In other words, I used a 'system approach'.
If the overall response was not acceptable, in all cases, replacing the 
PHEMT corrected it.


73,
Don W3FPR

On 5/12/2019 2:29 PM, Rajiv Dewan wrote:

Thanks Don for your prompt reply.

I built it a few years ago and I think it worked then.  I just got 
back into UHF and thought to check it out.  So, I am not sure if it 
worked before.


I have peaked the RX cap and LNA bias.

I measured the gain across the ATF to be 10.5dB.  Does that indicate 
that the PHEMT needs to be replaced?


Raj, N2RD

-- Original Message --
From: "Don Wilhelm" 
To: "Rajiv Dewan" ; Elecraft@mailman.qth.net
Sent: 5/12/2019 2:03:48 PM
Subject: Re: [Elecraft] XV432 deaf


Raj,

Has this XV432 worked before and recently developed weak receive?  If 
so, try peaking the RX input capacitor, and if that does not correct 
it, replace the PHEMT (ATF34143).


If you recently acquired it, check the configuration jumpers for the 
28 MHz IF - do you have a single coax and it is configured for 
separate TX and RX IF (or vice-versa)?


73,
Don W3FPR

On 5/12/2019 1:44 PM, Rajiv Dewan wrote:

Dear all,



   I have a XV432 that seems deaf compared to my ICOM IC-7000.  When 
I tune to a local beacon on 432.300 MHz, I can copy it clearly on 
the IC but nothing is heard on the XV432/K3 with KXV3B.  I checked 
transverter set up by feeding it a signal from a signal gen.  It has 
a conversion gain of about 16 to 17dB.  The specs say 20dB.  This 
does seem to be too bad.




   I checked the front end RF circuit out by feeding in a -80dBm 
signal from HP8657B signal generator set to 432.300MHz.  The 
ATF34143 seems to have a net gain of 11dB. The next MMIC MAV11 seems 
to have a gain of 10.5dB.  Are these within spec?




If I can fix it without altering the circuit, that would be ideal.



Else, I am considering two mods:

Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) 
with appropriate change in the bias resistor (120 1W to 270 ohms 
1/4W)Insert a W6PQL LNA (uses PGA103+) between K10 and the ATF on 
board.



Thoughts/ideas are very welcome,






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Re: [Elecraft] XV432 deaf

[Rajiv Dewan]

Thanks Don for your prompt reply.

I built it a few years ago and I think it worked then.  I just got back 
into UHF and thought to check it out.  So, I am not sure if it worked 
before.


I have peaked the RX cap and LNA bias.

I measured the gain across the ATF to be 10.5dB.  Does that indicate 
that the PHEMT needs to be replaced?


Raj, N2RD

-- Original Message --
From: "Don Wilhelm" 
To: "Rajiv Dewan" ; Elecraft@mailman.qth.net
Sent: 5/12/2019 2:03:48 PM
Subject: Re: [Elecraft] XV432 deaf


Raj,

Has this XV432 worked before and recently developed weak receive?  If so, try 
peaking the RX input capacitor, and if that does not correct it, replace the 
PHEMT (ATF34143).

If you recently acquired it, check the configuration jumpers for the 28 MHz IF 
- do you have a single coax and it is configured for separate TX and RX IF (or 
vice-versa)?

73,
Don W3FPR

On 5/12/2019 1:44 PM, Rajiv Dewan wrote:

Dear all,



   I have a XV432 that seems deaf compared to my ICOM IC-7000.  When I tune to 
a local beacon on 432.300 MHz, I can copy it clearly on the IC but nothing is 
heard on the XV432/K3 with KXV3B.  I checked transverter set up by feeding it a 
signal from a signal gen.  It has a conversion gain of about 16 to 17dB.  The 
specs say 20dB.  This does seem to be too bad.



   I checked the front end RF circuit out by feeding in a -80dBm signal from 
HP8657B signal generator set to 432.300MHz.  The ATF34143 seems to have a net 
gain of 11dB.  The next MMIC MAV11 seems to have a gain of 10.5dB.  Are these 
within spec?



If I can fix it without altering the circuit, that would be ideal.



Else, I am considering two mods:

Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) with 
appropriate change in the bias resistor (120 1W to 270 ohms 1/4W)Insert a W6PQL 
LNA (uses PGA103+) between K10 and the ATF on board.


Thoughts/ideas are very welcome,



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Re: [Elecraft] XV432 deaf

[Don Wilhelm]

Raj,

Has this XV432 worked before and recently developed weak receive?  If 
so, try peaking the RX input capacitor, and if that does not correct it, 
replace the PHEMT (ATF34143).


If you recently acquired it, check the configuration jumpers for the 28 
MHz IF - do you have a single coax and it is configured for separate TX 
and RX IF (or vice-versa)?


73,
Don W3FPR

On 5/12/2019 1:44 PM, Rajiv Dewan wrote:

Dear all,



   I have a XV432 that seems deaf compared to my ICOM IC-7000.  When I 
tune to a local beacon on 432.300 MHz, I can copy it clearly on the IC 
but nothing is heard on the XV432/K3 with KXV3B.  I checked transverter 
set up by feeding it a signal from a signal gen.  It has a conversion 
gain of about 16 to 17dB.  The specs say 20dB.  This does seem to be too 
bad.




   I checked the front end RF circuit out by feeding in a -80dBm signal 
from HP8657B signal generator set to 432.300MHz.  The ATF34143 seems to 
have a net gain of 11dB.  The next MMIC MAV11 seems to have a gain of 
10.5dB.  Are these within spec?




If I can fix it without altering the circuit, that would be ideal.



Else, I am considering two mods:

Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) with 
appropriate change in the bias resistor (120 1W to 270 ohms 1/4W)Insert 
a W6PQL LNA (uses PGA103+) between K10 and the ATF on board.



Thoughts/ideas are very welcome,


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[Elecraft] XV432 deaf

[Rajiv Dewan]

Dear all,



  I have a XV432 that seems deaf compared to my ICOM IC-7000.  When I 
tune to a local beacon on 432.300 MHz, I can copy it clearly on the IC 
but nothing is heard on the XV432/K3 with KXV3B.  I checked transverter 
set up by feeding it a signal from a signal gen.  It has a conversion 
gain of about 16 to 17dB.  The specs say 20dB.  This does seem to be too 
bad.




  I checked the front end RF circuit out by feeding in a -80dBm signal 
from HP8657B signal generator set to 432.300MHz.  The ATF34143 seems to 
have a net gain of 11dB.  The next MMIC MAV11 seems to have a gain of 
10.5dB.  Are these within spec?




If I can fix it without altering the circuit, that would be ideal.



Else, I am considering two mods:

Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) with 
appropriate change in the bias resistor (120 1W to 270 ohms 1/4W)Insert 
a W6PQL LNA (uses PGA103+) between K10 and the ATF on board.



Thoughts/ideas are very welcome,



Raj

--

Raj Dewan, N2RD
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Re: [Elecraft] XV432 LO changed to DigiLo Synthesizer

[Mike Lewis]

Little typo with big impact
The line

I recently integrated a DigiLo 6GHz PLL synthesizer with a 10Mhz double oven 
OCXO into my 10GHz system and it is no rock solid.  Should be

Should be

I recently integrated a DigiLo 6GHz PLL synthesizer with a 10Mhz double oven 
OCXO into my 10GHz system and it is NOW rock solid.

It works well…

From: Mike Lewis
Sent: Saturday, March 2, 2019 19:35
To: 'elecraft@mailman.qth.net' 
Subject: XV432 LO changed to DigiLo Synthesizer

A few days ago I tried FT-8 on 432 and discovered that my LO was not stable, 
hopping around several Hz plus drifting up to 40Hz . The 9V LO power was flat 
in both TX an RX, oven working. pushed, prodded, re-soldered, tuned, detuned, 
no change.

I recently integrated a DigiLo 6GHz PLL synthesizer with a 10Mhz double oven 
OCXO into my 10GHz system and it is no rock solid.  It has 255 preprogrammed 
frequencies, 404MHz being #2.  So today I removed C82 (coupling cap to L5 
filter section)  and U2 (the LO 78L09 regulator).  Drilled a hole near the 
power connector for a small SMA bulkhead connector.  RG316 run from that to the 
C80 side of C82 PCB pad, soldered the shield to the L3 can. Set LO power jumper 
block to 1-2 so only on when the XV432 is selected.  Nothing to warm up inside 
the XV432 any longer. The oven still powers up, but the rest of the LO is 
powered down so no matter.  I wanted to keep all the parts inside and this can 
be backed out easily.  I soldered the 78L09 to the nearby ground test clip loop 
so it could be found easily someday.

The Digilo is around +2dBm output and the XV432 mixer wants closer to 17dBm.  
Fortunately there is a MMIC amp between the LO filter and mixer (fed from the 
LO power jumper blocks). Feeding the Digilo at C80 runs it through L5 filter 
section and TP1 is at 3.1VDC.  Good enough.

Happy to say it is working great, super weak beacons I was hearing before are 
now spot on, 0 drift, and the K3 offset correction (XVx OFS) is set to 0.

Next up is to package the DigiLo and OCXO into a standalone metal case, add 
logic (CPU or 8-3bit encoder) to read the band decoder to auto set the correct 
LO frequency for different transverters.  I am using my KRC2 -> TTL SP4T coax 
relay control lines for that. Will also add a manual programming switch.  Then 
will convert the XV22 and my DEMI 902 an 1296 transverters, and of course the 
10GHz system.

I previously changed the PA module from the Toshiba to the Mitsubishi module.  
Retuned the front end, it is ready for FT-8 and other digital modes now.

Mike, K7MDL
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[Elecraft] XV432 LO changed to DigiLo Synthesizer

[Mike Lewis]

A few days ago I tried FT-8 on 432 and discovered that my LO was not stable, 
hopping around several Hz plus drifting up to 40Hz . The 9V LO power was flat 
in both TX an RX, oven working. pushed, prodded, re-soldered, tuned, detuned, 
no change.

I recently integrated a DigiLo 6GHz PLL synthesizer with a 10Mhz double oven 
OCXO into my 10GHz system and it is no rock solid.  It has 255 preprogrammed 
frequencies, 404MHz being #2.  So today I removed C82 (coupling cap to L5 
filter section)  and U2 (the LO 78L09 regulator).  Drilled a hole near the 
power connector for a small SMA bulkhead connector.  RG316 run from that to the 
C80 side of C82 PCB pad, soldered the shield to the L3 can. Set LO power jumper 
block to 1-2 so only on when the XV432 is selected.  Nothing to warm up inside 
the XV432 any longer. The oven still powers up, but the rest of the LO is 
powered down so no matter.  I wanted to keep all the parts inside and this can 
be backed out easily.  I soldered the 78L09 to the nearby ground test clip loop 
so it could be found easily someday.

The Digilo is around +2dBm output and the XV432 mixer wants closer to 17dBm.  
Fortunately there is a MMIC amp between the LO filter and mixer (fed from the 
LO power jumper blocks). Feeding the Digilo at C80 runs it through L5 filter 
section and TP1 is at 3.1VDC.  Good enough.

Happy to say it is working great, super weak beacons I was hearing before are 
now spot on, 0 drift, and the K3 offset correction (XVx OFS) is set to 0.

Next up is to package the DigiLo and OCXO into a standalone metal case, add 
logic (CPU or 8-3bit encoder) to read the band decoder to auto set the correct 
LO frequency for different transverters.  I am using my KRC2 -> TTL SP4T coax 
relay control lines for that. Will also add a manual programming switch.  Then 
will convert the XV22 and my DEMI 902 an 1296 transverters, and of course the 
10GHz system.

I previously changed the PA module from the Toshiba to the Mitsubishi module.  
Retuned the front end, it is ready for FT-8 and other digital modes now.

Mike, K7MDL
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Re: [Elecraft] XV432

[David Ferrington, M0XDF]

Ah, I did wonder. I think I got very lucky, a UK ham has offered to sell me one 
in the spring.
Feeling very happy.

73 de David, M0XDF (K3 #174, P3 #108)
-- 
Experience is that marvellous thing that enables you to recognize a mistake 
when you make it again. -Franklin P. Jones

> On 25 Nov 2017, at 14:41, Don Wilhelm  wrote:
> 
> David,
> 
> The XV432 was discontinued because some of the critical parts are no
> longer available.
> 
> 73,
> Don W3FPR
> 
> On 11/24/2017 6:18 PM, David Ferrington, M0XDF wrote:
>> That’s a shame, that was going to be a purchase next year. Did Elecraft 
>> discontinue this because it wasn’t selling?
>> 
> 

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Re: [Elecraft] XV432

[Don Wilhelm]

David,

The XV432 was discontinued because some of the critical parts are no 
longer available.


73,
Don W3FPR

On 11/24/2017 6:18 PM, David Ferrington, M0XDF wrote:

That’s a shame, that was going to be a purchase next year. Did Elecraft 
discontinue this because it wasn’t selling?



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Re: [Elecraft] XV432

[Ken Alexander]

Just sold mine today.  I guess I could have asked for a lot more for it but I'm 
not the opportunistic type. 
73,
KenVE3HLS

Sent from Yahoo Mail on Android

 
 
  On Fri, 24 Nov 2017 at 18:18, David Ferrington, M0XDF 
wrote:   That’s a shame, that was going to be a purchase next year. Did 
Elecraft discontinue this because it wasn’t selling?

Anyone got one they want to sell?

-73 de M0XDF (from my iPhone)

> On 24 Nov 2017, at 22:18, Don Wilhelm  wrote:
> 
> David,
> 
> Yes, the XV432 has been discontinued.
> 
> 73,
> Don W3FPR
> 
>> On 11/24/2017 5:09 PM, David Ferrington, M0XDF wrote:
>> Just looking at Elecraft's order page - no they no long manufacture the 
>> XV432?

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Re: [Elecraft] XV432

[David Ferrington, M0XDF]

That’s a shame, that was going to be a purchase next year. Did Elecraft 
discontinue this because it wasn’t selling?

Anyone got one they want to sell?

-73 de M0XDF (from my iPhone)

> On 24 Nov 2017, at 22:18, Don Wilhelm  wrote:
> 
> David,
> 
> Yes, the XV432 has been discontinued.
> 
> 73,
> Don W3FPR
> 
>> On 11/24/2017 5:09 PM, David Ferrington, M0XDF wrote:
>> Just looking at Elecraft's order page - no they no long manufacture the 
>> XV432?

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Re: [Elecraft] XV432

[Don Wilhelm]

David,

Yes, the XV432 has been discontinued.

73,
Don W3FPR

On 11/24/2017 5:09 PM, David Ferrington, M0XDF wrote:

Just looking at Elecraft's order page - no they no long manufacture the XV432?

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[Elecraft] XV432

[David Ferrington, M0XDF]

Just looking at Elecraft's order page - no they no long manufacture the XV432?
73 de David, M0XDF (K3 #174, P3 #108)
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[Elecraft] XV432 Trips Off on Tranmit

[Lewis Phelps]

My XV432 transporter has suddenly developed a serious problem. Receive mode 
works fine, but when I try to transmit, it instantly shuts down, apparently 
because of a bad SWR mismatch or similar problem.

I’ve checked my cables, and replaced them. I’ve checked all the settings on the 
Main Menu.  I’ve tried with two different antennas and a dummy load, and with 
differing coax cables.  I’ve checked all the on-board coax plugs on the KIO3 
board, checked to make sure the KIO3 board is properly seated,  etc.   Transmit 
power is set at 0.1 watt. Nothing resolves the problem. Any suggestions as to 
what I have failed to look for?  Any suggestions as to how I can differentiate 
between  transverter problem and a KIO3 problem?

Thanks in advance for any assistance.

Lew 


Lew Phelps N6LEW
Pasadena, CA DM04wd
Elecraft K3-10 / KXV144 / XV432
Yaesu FT-7800 
l...@n6lew.us
www.n6lew.us

Sent from my Mac Pro 256-Array Supercomputer (9.42 teraflops)





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Re: [Elecraft] XV432 Trips Off on Tranmit

[Lewis Phelps]

Make that read “transverter” in first line. Thanks a lot to Apple auto spelling 
correction….


Lew Phelps N6LEW
Pasadena, CA DM04wd
Elecraft K3-10 / KXV144 / XV432
Yaesu FT-7800 
l...@n6lew.us
www.n6lew.us

Sent from my Mac Pro 256-Array Supercomputer (9.42 teraflops)





 On Feb 25, 2015, at 9:48 PM, Lewis Phelps l...@n6lew.us wrote:
 
 My XV432 transporter has suddenly developed a serious problem. Receive mode 
 works fine, but when I try to transmit, it instantly shuts down, apparently 
 because of a bad SWR mismatch or similar problem.
 
 I’ve checked my cables, and replaced them. I’ve checked all the settings on 
 the Main Menu.  I’ve tried with two different antennas and a dummy load, and 
 with differing coax cables.  I’ve checked all the on-board coax plugs on the 
 KIO3 board, checked to make sure the KIO3 board is properly seated,  etc.   
 Transmit power is set at 0.1 watt. Nothing resolves the problem. Any 
 suggestions as to what I have failed to look for?  Any suggestions as to how 
 I can differentiate between  transverter problem and a KIO3 problem?
 
 Thanks in advance for any assistance.
 
 Lew 
 
 
 Lew Phelps N6LEW
 Pasadena, CA DM04wd
 Elecraft K3-10 / KXV144 / XV432
 Yaesu FT-7800 
 l...@n6lew.us mailto:l...@n6lew.us
 www.n6lew.us http://www.n6lew.us/
 
 Sent from my Mac Pro 256-Array Supercomputer (9.42 teraflops)
 
 
 
 
 

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[Elecraft] XV432 and EME

[Mike Harris]

Hi,

Anyone using the XV432 for EME?  Issues?

Regards,

Mike VP8NO
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[Elecraft] XV432 - Is L19 red,orange or yellow?

[Ken Alexander]

Hi folks,

I'm working on my XV432 kit this weekend.  I ordered the high accuracy 
crystal and the crystal oven options as well.  I'm on page 31 of the 
XV432 manual, where it is asking me to locate L4 and L19 for 
installation.  I see that L19 appears to get replaced when installing 
the high accuracy crystal option.


The manual says:

L4 has an orange body with four turns.  (It looks red to me and it has 
3.5 turns, close enough I guess)
L19 has a yellow body with four turns.  (I count 4.5 turns, _definitely_ 
one more turn than L4.  At least it's yellow)


The installation instructions that come with the high accuracy crystal 
option say to remove L19 from the circuit board.  Since I'm just about 
to install it this seems like a good time to make the substitution.  
EXCEPT, it says that L19 has a RED plastic coil form, not yellow like 
the XV432 manual says.  I do note that the substitute coil that comes in 
the high accuracy crystal option is yellow and has exactly the same 4.5 
turns as the yellow bodied coil called L19 in the XV432 assembly manual.


I assume the error is in the instruction sheet for the high accuracy 
crystal option, and that they meant to say that L19 is yellow and not 
red.  However, I'd feel safer if someone who has built one before could 
kindly confirm this.


The second thing that bothers me is why does one 4-turn inductor have 
one more turn than the other 4-turn inductor?


Any assistance will be gratefully accepted.

Thanks and 73,

Ken Alexander
VE3HLS
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Re: [Elecraft] XV432 - Is L19 red,orange or yellow?

[Don Wilhelm]

Ken,

If you have a recent XV432 (within the past 2 months), it is being 
shipped with the High Accuracy crystal.
Look at the markings on the crystal that came with the XV432, and 
compare it with the crystal shipped with the High Accuracy Kit - if it 
is the same, you can put either crystal in and Check L19 as well, they 
should be the same.


In other words, the High Accuracy Kit is a retrofit for older XV432 
transverters, and is not necessary for new ones.


73,
Don W3FPR

On 8/30/2014 6:26 PM, Ken Alexander wrote:

Hi folks,

I'm working on my XV432 kit this weekend.  I ordered the high accuracy 
crystal and the crystal oven options as well.  I'm on page 31 of the 
XV432 manual, where it is asking me to locate L4 and L19 for 
installation.  I see that L19 appears to get replaced when installing 
the high accuracy crystal option.


The manual says:

L4 has an orange body with four turns.  (It looks red to me and it has 
3.5 turns, close enough I guess)
L19 has a yellow body with four turns.  (I count 4.5 turns, 
_definitely_ one more turn than L4.  At least it's yellow)


The installation instructions that come with the high accuracy crystal 
option say to remove L19 from the circuit board.  Since I'm just about 
to install it this seems like a good time to make the substitution.  
EXCEPT, it says that L19 has a RED plastic coil form, not yellow like 
the XV432 manual says.  I do note that the substitute coil that comes 
in the high accuracy crystal option is yellow and has exactly the same 
4.5 turns as the yellow bodied coil called L19 in the XV432 assembly 
manual.


I assume the error is in the instruction sheet for the high accuracy 
crystal option, and that they meant to say that L19 is yellow and not 
red.  However, I'd feel safer if someone who has built one before 
could kindly confirm this.


The second thing that bothers me is why does one 4-turn inductor have 
one more turn than the other 4-turn inductor?


Any assistance will be gratefully accepted.

Thanks and 73,

Ken Alexander
VE3HLS
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[Elecraft] XV432 Demon Exorcism Operations

[Mark Adams]

Hi Gang,

I have an XV432 that is giving me fits. While my XV222 works FB with my K3/KXV3 
combo, or any other IF rig for that matter, the XV432 has only worked well with 
my FT817 and 5W drive. While getting stuff together for the August UHF Contest, 
I now cannot even run the XV432 with the K3 because as soon as I select it, the 
radio locks up. The display is on but the buttons on the radio do nothing. The 
only remedy is to put the power cord from the radio and disconnect the I/O 
cable. Does not matter which of the 2 transverter ends on the cable I use. 
Again, the XV222 is FB and 432 won’t work.

Some Googling turned up NT4RT who gave a paper at the 2012 SVHFS conference on 
a bunch of mods for the XV432 to make it work better. Lots of ground via 
connections, connector rework stuff and loads of changing signal paths by 
scraping solder mask and cutting traces. All very involved. I have the paper in 
my Evernote account and will share if you have not seen it, pending NT4RT’s 
approval. I’m not sure it he wants it to be “public”.

My unit has the errata items performed along with an input filter at the TX1 
connection described by a DL ham IIRC.

So, here are my questions.

1. Is anyone using their K3 with the XV432 in original as-built condition with 
good success? No self oscillation or other issues?
2. What mods did you make to tame the demons, if any?

I’m to the point where I need to decide:

A. Fix this one which may take A LONG TIME. But that gives me a K3/XV222 and 
432 for 6/222/432 in the rear position of my rover with one headphone, one key, 
yada yada.
B. Ditch the XV432 and use my FT100D as my 6/222/432. This is a pain because 
running on 6 and 432 key 222. I’ve run into problems doing this and it really 
requires that the XV222 be turned OFF except when in use. I suppose I could 
build a switch that would power up the XV222 when I’ve selected the 28MHz band 
on the 100D.
C: Build another XV432 and use the current one for spare parts.

Your ideas are greatly welcome.

-- 
73,
Mark K2QO
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Re: [Elecraft] XV432 Demon Exorcism Operations

[Don Wilhelm]

Mark,

I cannot identify exactly with your problem statement (K3 locks up), but 
I can give you a few suggestions that may help if you are willing to 
experiment a bit.


First of all, you can try putting a low pass filter between the XV432 
and the K3 low power TX output.  The one I use is a Mini-Circuits 
BLP-30+, but any LPF with a cutoff in the 30 to 36 MHz range should work 
just as well (it would not hurt to include in the coax to the other 
transverters as well if the IF cables are daisy-chained).


The purpose is to eliminate any 432 MHz energy from getting back into 
the K3.  Normally the symptoms are only that the transverter TX output 
is 'fooled' into thinking there is 28 MHz power when actually there is 
very little - but your symptoms seem to be more severe.  It may be worth 
a try in any case.


The 2nd is the power output module in the XV432 itself.  That module was 
changed about 6 months (maybe a year, my memory for dates is short).  
The older module was an SAU82L and the new module is E600120 RA30H4047M1 
High Power Module.  The new metal shielded module prevents self 
oscillation as well as having much better linearity than the older module.


My suspicion is that 432 MHz energy is getting back into your K3 and 
causing the difficulties.
Check your XV432 output connector - it *must* be mounted with the flange 
on the outside of the rear panel.  Also check that the paint has been 
removed from all the XV432 panels where they contact the 2D connectors.  
The is important for proper shielding of the XV432.  While that is 
applicable to all the XVxxx series transverters, it is critical for the 
XV432.


73,
Don W3FPR

On 7/26/2014 8:15 PM, Mark Adams wrote:

Hi Gang,

I have an XV432 that is giving me fits. While my XV222 works FB with my K3/KXV3 
combo, or any other IF rig for that matter, the XV432 has only worked well with 
my FT817 and 5W drive. While getting stuff together for the August UHF Contest, 
I now cannot even run the XV432 with the K3 because as soon as I select it, the 
radio locks up. The display is on but the buttons on the radio do nothing. The 
only remedy is to put the power cord from the radio and disconnect the I/O 
cable. Does not matter which of the 2 transverter ends on the cable I use. 
Again, the XV222 is FB and 432 won’t work.

Some Googling turned up NT4RT who gave a paper at the 2012 SVHFS conference on 
a bunch of mods for the XV432 to make it work better. Lots of ground via 
connections, connector rework stuff and loads of changing signal paths by 
scraping solder mask and cutting traces. All very involved. I have the paper in 
my Evernote account and will share if you have not seen it, pending NT4RT’s 
approval. I’m not sure it he wants it to be “public”.

My unit has the errata items performed along with an input filter at the TX1 
connection described by a DL ham IIRC.




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Re: [Elecraft] XV432 Demon Exorcism Operations

[Mark Adams]

Many have asked and KT4RT said it is OK to make his XV432 mods public, so here 
you go!

https://www.evernote.com/shard/s88/sh/b4588946-8e2c-4cc5-aee4-a84aaee62655/88ef921572b978f00b25f512e1c693cd

Mark Adams, K2QO
FN03ra
 Sent from my iPad
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[Elecraft] [XV432] Demand of time to build?

[Helmut Berka]

Hi,

How long does it take to build a XV432-Transverter?

 





vy 73 de


Helmut - DL2MAJ 
-

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Re: [Elecraft] [XV432] Demand of time to build?

[Don Wilhelm]

Helmut,

My best estimate is 8 to 12 hours depending on your skill level.

73,
Don W3FPR

On 9/21/2013 9:14 AM, Helmut Berka wrote:

How long does it take to build a XV432-Transverter?


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Re: [Elecraft] [XV432} LO Instability Problem

[GuyG0UKN]

Hi Ian,

I had exactly the same problem with my XV 432 and scratched my head for some
time. The outcome was that I had during construction switched the coils to
be used for L4 and L19 (the two unshielded coils).
This had the effect of not allowing me to set the LO on frequency. it would
slide off either side of the wanted frequency and the crystal appeared
damped and would stop oscillating.
Once I swapped the inductors over and re-aligned it would sit on fequency
perfectly once warmed up.
I fully recomend the crystal oven and high accuracy crystal and leaving the
oven on all the time using the jumpers.

73
Guy
G0UKN



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Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] XV432 - No intermediate pwr output

[Tom Warren]

I purchased this unit used ( nice workmanship) and it seems to work well in 
all respects 
except as noted below. I must add that the prior owner told me up front that 
there
was an issue with its power. However, when I first put it online line it seemed 
to work ok.

   Originally I used it with my K2/100 to drive a Mirage D1010 (100w) in ssb 
mode.  As
time passed, the unit started to show signs of loss of power similar to a high 
swr turn back
or high heat shutoff and I attributed it to a failing relay in the Mirage, 
which I cleaned and the 
system seemed to again work ok for a while.  After a reoccurrence, I switched 
to another rig 
for my 432 activities and let the XV432 sit on the shelf while I mulled the 
issue.

 I now have a Flex 5000 online and in the process of interfacing the XV432 with 
good results
except for the old issue again and I'm determined to figure out the problem 
since it really seems 
to be the transverter and not the K2 or Mirage.

  The setup;

 Flex 5000
Single coax interface
RCA keyline
XV432
Bird 43 (25W slug)
Bird dummy load

 Here's what I've found;

1)  As I start the Flexs' drive, the XV432 output turns on at 0w then continues 
to increase to 2.5w 
   then 'shuts off' and power drops to 0.
2) As I continue to increase the drive, the output power again turns on at 
about 15w and increases to 20w +.   

I've looked all over the internet for a similar problem but don't find 
anything. Maybe someone out there 
can point me in the right direction before really hitting the books and at my 
age gray matter is in short supply ;0).

Thanks in advance for any help.
73
Tom
W4TMW





 
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Re: [Elecraft] XV432 - No intermediate pwr output

[Don Wilhelm]

Tom,

That is really weird behavior.  It should be linear.
What is the power level from the Flex for a full 20 watts output?

I am going to assume that the XV432 LEDs show you the proper power 
output - if not, calibrate the LEDs at 20 watts output  (Power Cal pot 
in the left rear quadrant) so you can use the LEDs to monitor the output 
while you temporarily move the Bird wattmeter between the Flex and the 
XV432.


The only thing I can think of is that the Local Oscillator in the XV432 
is dropping out. You can remove the top cover and monitor the DC voltage 
at the test point near the front center.  You will have to catch it in 
the act, so keep transmission times short to keep from overheating the 
XV432.


There is one other potential problem, if you are using transverter IF 
output from the Flex, and that is that some 432 MHz energy is getting 
back into the Flex and fooling its power output mechanism into 
thinking there is more 28 MHz drive than actually exists.
The answer to that problem is to insert a Low Pass Filter with a cutoff 
somewhere between 30 MHz and 50 MHz between the Flex and the XV432.


73,
Don W3FPR

On 2/4/2013 3:15 PM, Tom Warren wrote:

 I purchased this unit used ( nice workmanship) and it seems to work well 
in all respects
except as noted below. I must add that the prior owner told me up front that 
there
was an issue with its power. However, when I first put it online line it seemed 
to work ok.

Originally I used it with my K2/100 to drive a Mirage D1010 (100w) in ssb 
mode.  As
time passed, the unit started to show signs of loss of power similar to a high 
swr turn back
or high heat shutoff and I attributed it to a failing relay in the Mirage, 
which I cleaned and the
system seemed to again work ok for a while.  After a reoccurrence, I switched 
to another rig
for my 432 activities and let the XV432 sit on the shelf while I mulled the 
issue.

  I now have a Flex 5000 online and in the process of interfacing the XV432 
with good results
except for the old issue again and I'm determined to figure out the problem 
since it really seems
to be the transverter and not the K2 or Mirage.

   The setup;

  Flex 5000
Single coax interface
RCA keyline
XV432
Bird 43 (25W slug)
Bird dummy load

  Here's what I've found;

1)  As I start the Flexs' drive, the XV432 output turns on at 0w then continues 
to increase to 2.5w
then 'shuts off' and power drops to 0.
2) As I continue to increase the drive, the output power again turns on at 
about 15w and increases to 20w +.

I've looked all over the internet for a similar problem but don't find 
anything. Maybe someone out there
can point me in the right direction before really hitting the books and at my 
age gray matter is in short supply ;0).

Thanks in advance for any help.
73
Tom
W4TMW



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Re: [Elecraft] XV432 - No intermediate pwr output

[M Cresap]

I had a similar problem with my XV432. I was able to chase the problem to the 
tx 
driver stage. The fix was to add ground vias from the top to the bottom of the 
board in a few judicious places. I passed this info back to Gary at Elecraft. I 
know of at least one other XV432 that has been stabilized by this method. I 
don't see those mods in the latest XV432 errata sheet, perhaps they vias have 
been added to the latest circuit board or they have found other ways to cure 
the problem.73, Mike, W3IP


--- On Mon, 2/4/13, Tom Warren mtn...@hartcom.net wrote:


From: Tom Warren mtn...@hartcom.net
Subject: [Elecraft] XV432 - No intermediate pwr output
To: elecraft@mailman.qth.net
Date: Monday, February 4, 2013, 8:15 PM



    I purchased this unit used ( nice workmanship) and it seems to work well in 
all respects 
except as noted below. I must add that the prior owner told me up front that 
there
was an issue with its power. However, when I first put it online line it seemed 
to work ok.

   Originally I used it with my K2/100 to drive a Mirage D1010 (100w) in ssb 
mode.  As
time passed, the unit started to show signs of loss of power similar to a high 
swr turn back
or high heat shutoff and I attributed it to a failing relay in the Mirage, 
which I cleaned and the 
system seemed to again work ok for a while.  After a reoccurrence, I switched 
to another rig 
for my 432 activities and let the XV432 sit on the shelf while I mulled the 
issue.

I now have a Flex 5000 online and in the process of interfacing the XV432 with 
good results
except for the old issue again and I'm determined to figure out the problem 
since it really seems 
to be the transverter and not the K2 or Mirage.

  The setup;

Flex 5000
Single coax interface
RCA keyline
XV432
Bird 43 (25W slug)
Bird dummy load

Here's what I've found;

1)  As I start the Flexs' drive, the XV432 output turns on at 0w then continues 
to increase to 2.5w 
       then 'shuts off' and power drops to 0.
2) As I continue to increase the drive, the output power again turns on at 
about 15w and increases to 20w +.   

I've looked all over the internet for a similar problem but don't find 
anything. Maybe someone out there 
can point me in the right direction before really hitting the books and at my 
age gray matter is in short supply ;0).

Thanks in advance for any help.
73
Tom
W4TMW






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[Elecraft] XV432 - No intermediate pwr output

[Johnny Siu]

Hello Mike,
 
You are probably correct. XV432 had had problems in power and frequency 
stability.  However, with the evolution of time, elecraft has found out the 
ways to solve the problems.
 
I experienced similar problems in XV144 though not so serious as XV432

TNX  73,


Johnny VR2XMC



 寄件人︰ M Cresap m.cre...@yahoo.com
收件人︰ Tom Warren mtn...@hartcom.net 
副本(CC)︰ elecraft@mailman.qth.net 
傳送日期︰ 2013年02月5日 (週二) 9:21 AM
主題︰ Re: [Elecraft] XV432 - No intermediate pwr output
  
I had a similar problem with my XV432. I was able to chase the problem to the 
tx 
driver stage. The fix was to add ground vias from the top to the bottom of the 
board in a few judicious places. I passed this info back to Gary at Elecraft. I 
know of at least one other XV432 that has been stabilized by this method. I 
don't see those mods in the latest XV432 errata sheet, perhaps they vias have 
been added to the latest circuit board or they have found other ways to cure 
the problem.73, Mike, W3IP


--- On Mon, 2/4/13, Tom Warren mtn...@hartcom.net wrote:


From: Tom Warren mtn...@hartcom.net
Subject: [Elecraft] XV432 - No intermediate pwr output
To: elecraft@mailman.qth.net
Date: Monday, February 4, 2013, 8:15 PM



    I purchased this unit used ( nice workmanship) and it seems to work well in 
all respects 
except as noted below. I must add that the prior owner told me up front that 
there
was an issue with its power. However, when I first put it online line it seemed 
to work ok.

   Originally I used it with my K2/100 to drive a Mirage D1010 (100w) in ssb 
mode.  As
time passed, the unit started to show signs of loss of power similar to a high 
swr turn back
or high heat shutoff and I attributed it to a failing relay in the Mirage, 
which I cleaned and the 
system seemed to again work ok for a while.  After a reoccurrence, I switched 
to another rig 
for my 432 activities and let the XV432 sit on the shelf while I mulled the 
issue.

I now have a Flex 5000 online and in the process of interfacing the XV432 with 
good results
except for the old issue again and I'm determined to figure out the problem 
since it really seems 
to be the transverter and not the K2 or Mirage.

  The setup;

Flex 5000
Single coax interface
RCA keyline
XV432
Bird 43 (25W slug)
Bird dummy load

Here's what I've found;

1)  As I start the Flexs' drive, the XV432 output turns on at 0w then continues 
to increase to 2.5w 
       then 'shuts off' and power drops to 0.
2) As I continue to increase the drive, the output power again turns on at 
about 15w and increases to 20w +.   

I've looked all over the internet for a similar problem but don't find 
anything. Maybe someone out there 
can point me in the right direction before really hitting the books and at my 
age gray matter is in short supply ;0).

Thanks in advance for any help.
73
Tom
W4TMW
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Re: [Elecraft] [XV432} LO Instability Problem

[Robert Friess]

Hello Ian,

Comments below

On Fri, Jan 25, 2013 at 8:48 AM, Ian Greenshields 
ian.greenshie...@gmail.com wrote:

 Thanks for all the help and comments received so far, on and off reflector
 - I have to say the responsiveness and quality of help on this reflector is
 second to none!

 To summarise:

 1. I have tried detuning L4, along with L3 and L5. L4 is very sensitive as
 is probably to be expected, L3 and L5 somewhat less so. The most stable
 point of L4 does seem to coincide with the peak in voltage at TP1, and
 detuning L3 and L5 doesn't seem to make much difference. The problem is
 that the voltage at TP1 can easily reach 4v or higher, and the LO
 is definitely less stable if I detune it to keep the voltage below 3v.

 2. Is a voltage well above 3v at TP1 a problem? It seems to be just a
 detector diode circuit on the output of the LO, so I presume a fair amount
 of variation is to be expected.


This is not a problem.  You are correct there can be considerable variation
from unit to unit and crystal to crystal.



 3. The crystal seems mechanically stable in that tapping it doesn't send
 the frequency all over the place, but it is highly sensitive to being
 touched, which I assume is heating effect,


Likely correct.  The oven will make a very large improvement



 4. The biggest single improvement was a suggestion to ground the can of the
 crystal. This is something very familiar to any K2 builder. I grounded the
 crystal can, K2 filter style, to the oven -ve pad, which was the closest
 ground point. Huge improvement. The frequency jumping has gone, although
 there is still significant drift, even long after warm-up.

 5. I then tried readjusting L3, L4  L5 to see if detuning the voltage to
 about 2.5v at TP1 helped now that the oscillator seemed more stable. This
 seemed to be a backward step as the LO lurched down about 10kHz in
 frequency, started to drift back up, but then actually stopped oscillating.
 Restoring L3, L4 and L5 to the point where the voltage at TP1 peaks - about
 4v - seems to be the most stable point  the LO starts up fine. From switch
 on it drifts about 3kHz low, then as it warms up, it starts to drift HF
 until about 3 or 4kHz above the switch-on point.


Tune for a peak


 6. If my unit is normal, the oven would seem an essential. As I want to use
 the transverter on SSB, I can't really live with a drift range of 7kHz!

 7. What is the view on grounding the crystal can? It does seem to help
 tremendously with the stability (and I mean the 'crystal mode' stability,
 just to differentiate from drift).


I would order a second crystal along with the oven and first try it without
grounding the can.  If it still is necessary to ground the can then do it
at the bottom near the pc board so that you can install the oven.  I would
also utilize the option to leave the oscillator and its oven on
continuously.  This option is explained in the manual.

Bob, N6CM
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[Elecraft] [XV432} LO Instability Problem

[Ian Greenshields]

The LO on my XV432 transverter seems to be very unstable. I think it's
something more than just temperature drift as the frequency will sometimes
jump by several kHz. It's almost as if the crystal is hunting between
different modes of oscillation.

Prodding  wiggling the components in the LO circuit doesn't point to any
obvious poor connection, although the crystal itself is sensitive to being
touched, or heated by a finger. The LO alignment voltage at TP1 peaks at
about 3.3V.

I don't have the temperature oven for the crystal, although I think it's a
requirement. But I'm concerned about the frequency jumping and a frequency
drift of almost 10kHz which I would not expect even of a non-temperature
controlled crystal oscillator.

Any thoughts or pointers as to what could be wrong?

TIA, Ian G4FSU
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Re: [Elecraft] [XV432} LO Instability Problem

[Don Wilhelm]

Ian,

Two possibilities occur to me.  First, detune the LO inductors L3, L4 
and L5 a bit to give you 3 volts maximum at TP1 and see if it stabilizes.
Secondly, try adjusting L4 a bit.  It may be that the adjustment of L4 
puts the crystal right on the 'hairy' edge of oscillation which would 
make the frequency unstable.  The voltage at TP1 should remain between 
1.7 and 3.0 volts.


73,
Don W3FPR

On 1/25/2013 3:40 AM, Ian Greenshields wrote:

The LO on my XV432 transverter seems to be very unstable. I think it's
something more than just temperature drift as the frequency will sometimes
jump by several kHz. It's almost as if the crystal is hunting between
different modes of oscillation.

Prodding  wiggling the components in the LO circuit doesn't point to any
obvious poor connection, although the crystal itself is sensitive to being
touched, or heated by a finger. The LO alignment voltage at TP1 peaks at
about 3.3V.

I don't have the temperature oven for the crystal, although I think it's a
requirement. But I'm concerned about the frequency jumping and a frequency
drift of almost 10kHz which I would not expect even of a non-temperature
controlled crystal oscillator.

Any thoughts or pointers as to what could be wrong?

TIA, Ian G4FSU



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Re: [Elecraft] [XV432} LO Instability Problem

[John D'Ausilio]

Wasn't there some issue with the 78L09 at some point? I seem to recall
replacing the low-power versions with standard 7809s .. I'd have to
pop them open to check

de w1rt/john

On Fri, Jan 25, 2013 at 9:01 AM, Don Wilhelm w3...@embarqmail.com wrote:
 Ian,

 Two possibilities occur to me.  First, detune the LO inductors L3, L4 and L5
 a bit to give you 3 volts maximum at TP1 and see if it stabilizes.
 Secondly, try adjusting L4 a bit.  It may be that the adjustment of L4 puts
 the crystal right on the 'hairy' edge of oscillation which would make the
 frequency unstable.  The voltage at TP1 should remain between 1.7 and 3.0
 volts.

 73,
 Don W3FPR


 On 1/25/2013 3:40 AM, Ian Greenshields wrote:

 The LO on my XV432 transverter seems to be very unstable. I think it's
 something more than just temperature drift as the frequency will sometimes
 jump by several kHz. It's almost as if the crystal is hunting between
 different modes of oscillation.

 Prodding  wiggling the components in the LO circuit doesn't point to any
 obvious poor connection, although the crystal itself is sensitive to being
 touched, or heated by a finger. The LO alignment voltage at TP1 peaks at
 about 3.3V.

 I don't have the temperature oven for the crystal, although I think it's a
 requirement. But I'm concerned about the frequency jumping and a frequency
 drift of almost 10kHz which I would not expect even of a non-temperature
 controlled crystal oscillator.

 Any thoughts or pointers as to what could be wrong?

 TIA, Ian G4FSU


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Re: [Elecraft] [XV432} LO Instability Problem

[Don Wilhelm]

Not true on any XV series transverter I have worked on.  The leads of a 
7809 would not fit the board.


73,
Don W3FPR

On 1/25/2013 9:14 AM, John D'Ausilio wrote:

Wasn't there some issue with the 78L09 at some point? I seem to recall
replacing the low-power versions with standard 7809s .. I'd have to
pop them open to check

de w1rt/john




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Re: [Elecraft] [XV432} LO Instability Problem

[Geoffrey Mackenzie-Kennedy]

Ian,

Does the LO frequency jump if you tap the crystal's can using a plastic 
rod such as an alignment tool or pencil?  If it does, and if all of the 
soldered connections in the LO's circuit are sound, the jump and drift are 
most likely caused by some mechanical fault within the crystal assembly 
itself.  The only cure in such cases is to replace the crystal.


73,
Geoff
LX2AO


On January 25, 2013 at 9:40 AM, Ian Greenshields wrote:


The LO on my XV432 transverter seems to be very unstable. I think it's
something more than just temperature drift as the frequency will sometimes
jump by several kHz. It's almost as if the crystal is hunting between
different modes of oscillation.

Prodding  wiggling the components in the LO circuit doesn't point to any
obvious poor connection, although the crystal itself is sensitive to being
touched, or heated by a finger. The LO alignment voltage at TP1 peaks at
about 3.3V.

I don't have the temperature oven for the crystal, although I think it's a
requirement. But I'm concerned about the frequency jumping and a frequency
drift of almost 10kHz which I would not expect even of a non-temperature
controlled crystal oscillator.

Any thoughts or pointers as to what could be wrong?

TIA, Ian G4FSU


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Re: [Elecraft] [XV432} LO Instability Problem

[Ian Greenshields]

Thanks for all the help and comments received so far, on and off reflector
- I have to say the responsiveness and quality of help on this reflector is
second to none!

To summarise:

1. I have tried detuning L4, along with L3 and L5. L4 is very sensitive as
is probably to be expected, L3 and L5 somewhat less so. The most stable
point of L4 does seem to coincide with the peak in voltage at TP1, and
detuning L3 and L5 doesn't seem to make much difference. The problem is
that the voltage at TP1 can easily reach 4v or higher, and the LO
is definitely less stable if I detune it to keep the voltage below 3v.

2. Is a voltage well above 3v at TP1 a problem? It seems to be just a
detector diode circuit on the output of the LO, so I presume a fair amount
of variation is to be expected.

3. The crystal seems mechanically stable in that tapping it doesn't send
the frequency all over the place, but it is highly sensitive to being
touched, which I assume is heating effect,

4. The biggest single improvement was a suggestion to ground the can of the
crystal. This is something very familiar to any K2 builder. I grounded the
crystal can, K2 filter style, to the oven -ve pad, which was the closest
ground point. Huge improvement. The frequency jumping has gone, although
there is still significant drift, even long after warm-up.

5. I then tried readjusting L3, L4  L5 to see if detuning the voltage to
about 2.5v at TP1 helped now that the oscillator seemed more stable. This
seemed to be a backward step as the LO lurched down about 10kHz in
frequency, started to drift back up, but then actually stopped oscillating.
Restoring L3, L4 and L5 to the point where the voltage at TP1 peaks - about
4v - seems to be the most stable point  the LO starts up fine. From switch
on it drifts about 3kHz low, then as it warms up, it starts to drift HF
until about 3 or 4kHz above the switch-on point.

6. If my unit is normal, the oven would seem an essential. As I want to use
the transverter on SSB, I can't really live with a drift range of 7kHz!

7. What is the view on grounding the crystal can? It does seem to help
tremendously with the stability (and I mean the 'crystal mode' stability,
just to differentiate from drift).

I think my next step is to order the oven (I'm going to have fun fitting
that now I've grounded the can!)  possibly another crystal.

73 Ian G4FSU


On 25 January 2013 14:01, Don Wilhelm w3...@embarqmail.com wrote:

 Ian,

 Two possibilities occur to me.  First, detune the LO inductors L3, L4 and
 L5 a bit to give you 3 volts maximum at TP1 and see if it stabilizes.
 Secondly, try adjusting L4 a bit.  It may be that the adjustment of L4
 puts the crystal right on the 'hairy' edge of oscillation which would make
 the frequency unstable.  The voltage at TP1 should remain between 1.7 and
 3.0 volts.

 73,
 Don W3FPR


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[Elecraft] XV432 kit

[Vic Goncharsky]

Are XV432 kits still avaliable?

WTB and assemble one before IARU R1 UHF championship in October


73 Vic US5WE/K1WE (UW5W in VHF contests) KN29AU 
UARL VHF committee 
Chairman, UARL Lvov Branch LKK 
Moderator, UARL VHF portal http://www.vhfdx.at.ua 
DXCC card checker in Ukraine
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Re: [Elecraft] XV432 kit

[David Pratt]

In a recent message, Vic Goncharsky us...@yahoo.com writes
Are XV432 kits still avaliable?

WTB and assemble one before IARU R1 UHF championship in October

Yes, Vic, you can see them listed at...

http://www.elecraft.com/elecraft_prod_list.htm#xvs

73 de David G4DMP

-- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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Re: [Elecraft] XV432 kit

[Vic Goncharsky]

Hi Dave,

It doesn't say KIT in there, I checked this b4 writing to the reflector.

73 Vic





 From: David Pratt da...@g4dmp.fsnet.co.uk
To: Vic Goncharsky us...@yahoo.com 
Cc: elecraft@mailman.qth.net elecraft@mailman.qth.net 
Sent: Friday, August 10, 2012 11:59 AM
Subject: Re: [Elecraft] XV432 kit
 
In a recent message, Vic Goncharsky us...@yahoo.com writes
Are XV432 kits still avaliable?

WTB and assemble one before IARU R1 UHF championship in October

Yes, Vic, you can see them listed at...

http://www.elecraft.com/elecraft_prod_list.htm#xvs

73 de David G4DMP

-- 
+ - - - - - - - - - - - - - - - - +
| David M Pratt, Kippax, Leeds.   |
| Website: http://www.g4dmp.co.uk |
+ - - - - - - - - - - - - - - - - +
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Re: [Elecraft] XV432 kit

[David Pratt]

I see what you mean, Vic. I think your best bet is to e-mail Eric and 
ask him. He ought to make it clear on the website whether it's a kit or 
ready built. There should of course be a difference in price.

Like you, I like building stuff, would not consider buying a ready built 
rig and was a bit disappointed there was not more detailed assembly 
required for the K3.

I use an XV144 with my K2 and an XV'70' with my K3, both self-assembled.

73

David G4DMP

In a recent message, Vic Goncharsky us...@yahoo.com writes
Hi Dave,
It doesn't say KIT in there, I checked this b4 writing to the
reflector.
73 Vic

-- 
  + - - - - - - - - - - - - - - - - +
  | David M Pratt, Kippax, Leeds.   |
  | Website: http://www.g4dmp.co.uk |
  + - - - - - - - - - - - - - - - - +

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Re: [Elecraft] XV432 kit

[Bruce Beford]

The XV series transverters- including the XV432 are all kits- only the
surface mount components have been pre-installed on the PC board. The
builder must solder all the remaining parts, assemble the case and align the
unit. refer to the product description page (not the order page), and/or the
manual.

73,

Bruce, N1RX

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[Elecraft] XV432 Wanted

[Sebastian, W4AS]

Anyone have an XV432 transverter they would like to sell?  Please contact me 
direct.

73 de Sebastian, W4AS



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[Elecraft] XV432 Issues

[W3MW Don]

I've just finished assembly of the XV432 kit, interfaced to a K3, and ran into 
two issues during alignment in Part VI, Filter Alignment. 

First, during CW key-down, the voltage at TP5 peaks immediately, then slowly 
drops off until it is a volt or more lower than peak.  Immediately re-keying 
gets a somewhat higher voltage than at un-key, but not at the peak.  Letting it 
sit a minute or two, then re-keying, gets the original peak voltage back.  
Output power does the same fade.

Second, the 28 MHz filters don't seem to be aligning properly.  I've set the 
cans at the set-points in the manual, but L15 and L16 seem to peak with the 
slugs out of the cans.  L17 appears to peak ok, and the 432 filters both seem 
to peak fine.  At the best point of alignment, I am getting less than 7 volts 
at TP5, vs, 10 required for full output.  I've checked the K3 output, and the 
BNC cables, both are fine.  The input section of the XV is easily able to 
overdrive the input to the 28 MHz filters, as evidenced by D10 and D11 lighting 
up at roughly half setting on the input attenuator.  Max output from the PA is 
around 15 watts without lighting up D10 and D11.  I've pulled and checked the 
five caps around the filters, all are within tolerance.  Oscillator alignment 
was fine, 3v at TP1.  I've tried re-aligning these three cans several times, 
including bottoming out the slugs and working back up, with no change.

I'm on the air with it at the moment, and it seems to be working other than the 
low power output.  

Any thoughts?

Don   W3MW

w...@earthlink.net
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Re: [Elecraft] XV432 Issues

[Don Wilhelm]

Don,

The manual doesn't state that you must adjust for 10 volts at TP5.  
Please read that section again.

It does say that you should not exceed 10 volts at TP5 during the 
bandpass filter tuning.
If the output goes above 10 volts, use the input attenuator R22) to 
bring the voltage down - perhaps in the vicinity of 5 volts, and then 
continue to look for the peak tuning point for each inductor that is to 
be adjusted.
Go back over the peaking procedure 3 or 4 times.

After you have peaked the bandpass filters, you will then adjust the 
input attenuator to produce the correct output (use an external power 
meter which is accurate at 432 MHz) while your selected maximum drive 
level is applied from your transceiver.

After that (and while the transverter is producing 20 watts), you adjust 
R10 (Power CAL) so the LEDs indicate 20 watts.

These 3 steps must be done in order - do not skip ahead or you will end 
up with frustration.  Also, do not drive the transverter for too long at 
a time - particularly during the final power adjustments.  Give enough 
break time to let it cool between adjustment trials.

73,
Don W3FPR


On 8/6/2011 3:27 PM, W3MW Don wrote:
 I've just finished assembly of the XV432 kit, interfaced to a K3, and ran 
 into two issues during alignment in Part VI, Filter Alignment.

 First, during CW key-down, the voltage at TP5 peaks immediately, then slowly 
 drops off until it is a volt or more lower than peak.  Immediately re-keying 
 gets a somewhat higher voltage than at un-key, but not at the peak.  Letting 
 it sit a minute or two, then re-keying, gets the original peak voltage back.  
 Output power does the same fade.

 Second, the 28 MHz filters don't seem to be aligning properly.  I've set the 
 cans at the set-points in the manual, but L15 and L16 seem to peak with the 
 slugs out of the cans.  L17 appears to peak ok, and the 432 filters both seem 
 to peak fine.  At the best point of alignment, I am getting less than 7 volts 
 at TP5, vs, 10 required for full output.  I've checked the K3 output, and the 
 BNC cables, both are fine.  The input section of the XV is easily able to 
 overdrive the input to the 28 MHz filters, as evidenced by D10 and D11 
 lighting up at roughly half setting on the input attenuator.  Max output from 
 the PA is around 15 watts without lighting up D10 and D11.  I've pulled and 
 checked the five caps around the filters, all are within tolerance.  
 Oscillator alignment was fine, 3v at TP1.  I've tried re-aligning these three 
 cans several times, including bottoming out the slugs and working back up, 
 with no change.

 I'm on the air with it at the moment, and it seems to be working other than 
 the low power output.

 Any thoughts?

 Don   W3MW


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Re: [Elecraft] XV432 Issues

[W3MW Don]

Don,

Thanks for your reply.  It's great to get feedback here so quickly, 
especially as I managed to delay my question until a weekend.

I understand the section of the manual regarding 10 volts at TP5.  What I 
meant to indicate is that I cannot get anywhere near 9 or 10 volts at TP5 
following the normal alignment procedure, regardless of whatever setting the 
input attenuator is at.  I've followed the procedure by the manual, 
carefully, many times.  Despite repeated passes through the peaking process 
(many more than three or four, I'm afraid), I cannot get over 15 watts 
output or over 7.5 volts at TP5 regardless of the input attenuator setting. 
I've since checked the coils to be sure I have the correct ones in the 
filter.

K3 is set up for 1.00 power out, as instructed.
The fact that the overload LEDs are lighting up at the high end setting of 
the input attenuator leads me to believe that the IF in from the K3 is ok, 
and that both pre-filter amplifier stages are working as intended.
Adjustments of FL1 and FL2 are smooth and have a clearly identifiable peak, 
leading me to believe those are ok.   I'm not seeing any voltage changes 
elsewhere in the transmit chain, and the rest of the device voltages look 
good.

I made several attempts at alignment since your email, with no more success 
than earlier.  As I am concerned that the PA module may be flaky, rather 
than fry the thing by continuing to tune, it's going back to Elecraft on 
Monday for them to have a look.  I'll follow up here with the results.

Thanks again for your quick response.

73,

Don Appleby   W3MW
w...@earthlink.net

- Original Message - 
From: Don Wilhelm w3...@embarqmail.com
To: W3MW Don w...@earthlink.net
Cc: elecraft@mailman.qth.net
Sent: Saturday, August 06, 2011 5:15 PM
Subject: Re: [Elecraft] XV432 Issues


Don,

The manual doesn't state that you must adjust for 10 volts at TP5.
Please read that section again.

It does say that you should not exceed 10 volts at TP5 during the
bandpass filter tuning.
If the output goes above 10 volts, use the input attenuator R22) to
bring the voltage down - perhaps in the vicinity of 5 volts, and then
continue to look for the peak tuning point for each inductor that is to
be adjusted.
Go back over the peaking procedure 3 or 4 times.

After you have peaked the bandpass filters, you will then adjust the
input attenuator to produce the correct output (use an external power
meter which is accurate at 432 MHz) while your selected maximum drive
level is applied from your transceiver.

After that (and while the transverter is producing 20 watts), you adjust
R10 (Power CAL) so the LEDs indicate 20 watts.

These 3 steps must be done in order - do not skip ahead or you will end
up with frustration.  Also, do not drive the transverter for too long at
a time - particularly during the final power adjustments.  Give enough
break time to let it cool between adjustment trials.

73,
Don W3FPR


On 8/6/2011 3:27 PM, W3MW Don wrote:
 I've just finished assembly of the XV432 kit, interfaced to a K3, and ran 
 into two issues during alignment in Part VI, Filter Alignment.

 First, during CW key-down, the voltage at TP5 peaks immediately, then 
 slowly drops off until it is a volt or more lower than peak.  Immediately 
 re-keying gets a somewhat higher voltage than at un-key, but not at the 
 peak.  Letting it sit a minute or two, then re-keying, gets the original 
 peak voltage back.  Output power does the same fade.

 Second, the 28 MHz filters don't seem to be aligning properly.  I've set 
 the cans at the set-points in the manual, but L15 and L16 seem to peak 
 with the slugs out of the cans.  L17 appears to peak ok, and the 432 
 filters both seem to peak fine.  At the best point of alignment, I am 
 getting less than 7 volts at TP5, vs, 10 required for full output.  I've 
 checked the K3 output, and the BNC cables, both are fine.  The input 
 section of the XV is easily able to overdrive the input to the 28 MHz 
 filters, as evidenced by D10 and D11 lighting up at roughly half setting 
 on the input attenuator.  Max output from the PA is around 15 watts 
 without lighting up D10 and D11.  I've pulled and checked the five caps 
 around the filters, all are within tolerance.  Oscillator alignment was 
 fine, 3v at TP1.  I've tried re-aligning these three cans several times, 
 including bottoming out the slugs and working back up, with no change.

 I'm on the air with it at the moment, and it seems to be working other 
 than the low power output.

 Any thoughts?

 Don   W3MW


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Re: [Elecraft] XV432 Issues

[Don Wilhelm]

Don,

OK, and please understand that you will not necessarily obtain 10 volts 
at TP5.  The voltage there is only relative, and is only used to 
identify the peak - once the tuning peaks have been found, the voltage 
there is no longer relevant.  In other words, 10 volts at TP5 does not 
indicate full output, you must use a wattmeter that is accurate at 432 
MHz to determine the 20 watt level.

Can you measure the current that is being drawn while you attempt to get 
20 watts output?  If the current is excessive, there is a problem 
between the PA module and the antenna.

Assuming that the efficiency is 50%, it will take about 3 to 3.5 Amperes 
at 20 watts output.  As I indicated, a higher current indicates that 
there is a problem between the PA and the antenna output.
OTOH, if the current is lower, That indicates that the PA module is not 
receiving adequate drive.
If that is the case, try increasing the bias slightly to see if that 
gives any improvement.

My experience with the specifics of the XV432 is limited, so if the 
problem is low drive to the PA module, it is best to email 
supp...@elecraft.com - unfortunately, they take the weekend off for a 
well deserved rest (we volunteers do not have that privilege).

73,
Don W3FPR

On 8/6/2011 10:49 PM, W3MW Don wrote:
 Don,

 Thanks for your reply.  It's great to get feedback here so quickly,
 especially as I managed to delay my question until a weekend.

 I understand the section of the manual regarding 10 volts at TP5.  What I
 meant to indicate is that I cannot get anywhere near 9 or 10 volts at TP5
 following the normal alignment procedure, regardless of whatever setting the
 input attenuator is at.  I've followed the procedure by the manual,
 carefully, many times.  Despite repeated passes through the peaking process
 (many more than three or four, I'm afraid), I cannot get over 15 watts
 output or over 7.5 volts at TP5 regardless of the input attenuator setting.
 I've since checked the coils to be sure I have the correct ones in the
 filter.

 K3 is set up for 1.00 power out, as instructed.
 The fact that the overload LEDs are lighting up at the high end setting of
 the input attenuator leads me to believe that the IF in from the K3 is ok,
 and that both pre-filter amplifier stages are working as intended.
 Adjustments of FL1 and FL2 are smooth and have a clearly identifiable peak,
 leading me to believe those are ok.   I'm not seeing any voltage changes
 elsewhere in the transmit chain, and the rest of the device voltages look
 good.

 I made several attempts at alignment since your email, with no more success
 than earlier.  As I am concerned that the PA module may be flaky, rather
 than fry the thing by continuing to tune, it's going back to Elecraft on
 Monday for them to have a look.  I'll follow up here with the results.

 Thanks again for your quick response.

 73,

 Don Appleby   W3MW
 w...@earthlink.net

 - Original Message -
 From: Don Wilhelmw3...@embarqmail.com
 To: W3MW Donw...@earthlink.net
 Cc:elecraft@mailman.qth.net
 Sent: Saturday, August 06, 2011 5:15 PM
 Subject: Re: [Elecraft] XV432 Issues


 Don,

 The manual doesn't state that you must adjust for 10 volts at TP5.
 Please read that section again.

 It does say that you should not exceed 10 volts at TP5 during the
 bandpass filter tuning.
 If the output goes above 10 volts, use the input attenuator R22) to
 bring the voltage down - perhaps in the vicinity of 5 volts, and then
 continue to look for the peak tuning point for each inductor that is to
 be adjusted.
 Go back over the peaking procedure 3 or 4 times.

 After you have peaked the bandpass filters, you will then adjust the
 input attenuator to produce the correct output (use an external power
 meter which is accurate at 432 MHz) while your selected maximum drive
 level is applied from your transceiver.

 After that (and while the transverter is producing 20 watts), you adjust
 R10 (Power CAL) so the LEDs indicate 20 watts.

 These 3 steps must be done in order - do not skip ahead or you will end
 up with frustration.  Also, do not drive the transverter for too long at
 a time - particularly during the final power adjustments.  Give enough
 break time to let it cool between adjustment trials.

 73,
 Don W3FPR


 On 8/6/2011 3:27 PM, W3MW Don wrote:
 I've just finished assembly of the XV432 kit, interfaced to a K3, and ran
 into two issues during alignment in Part VI, Filter Alignment.

 First, during CW key-down, the voltage at TP5 peaks immediately, then
 slowly drops off until it is a volt or more lower than peak.  Immediately
 re-keying gets a somewhat higher voltage than at un-key, but not at the
 peak.  Letting it sit a minute or two, then re-keying, gets the original
 peak voltage back.  Output power does the same fade.

 Second, the 28 MHz filters don't seem to be aligning properly.  I've set
 the cans at the set-points in the manual, but L15 and L16 seem to peak
 with the slugs out of the cans.  L17

Re: [Elecraft] XV432 Issues

[Don Wilhelm]

Don,

The overload LEDs are a different situation from your tuning/power out 
situation.

Sometimes the overload LED indication is the result of noise getting 
into the XVxxx firmware chip.
The cure for that noise is to connect a capacitor between the collector 
and emitter (ground) or Q2 on the front panel board.  Any value between 
.001 and .01 uF should do nicely.

Of course, if you are driving the XV432 with a non-elecraft transceiver, 
it could be that the overload condition is real - if the XV432 (or any 
XV series transverter) detects RF before the Key-In signal is active, it 
will cause the overload condition.  I recall you are driving the XV432 
from the K3, so I would attribute the LED flashing to a noise condition 
on the overload signalling line, and the capacitor should calm it.

73,
Don W3FPR

On 8/6/2011 10:49 PM, W3MW Don wrote:
 Don,

 Thanks for your reply.  It's great to get feedback here so quickly,
 especially as I managed to delay my question until a weekend.

 I understand the section of the manual regarding 10 volts at TP5.  What I
 meant to indicate is that I cannot get anywhere near 9 or 10 volts at TP5
 following the normal alignment procedure, regardless of whatever setting the
 input attenuator is at.  I've followed the procedure by the manual,
 carefully, many times.  Despite repeated passes through the peaking process
 (many more than three or four, I'm afraid), I cannot get over 15 watts
 output or over 7.5 volts at TP5 regardless of the input attenuator setting.
 I've since checked the coils to be sure I have the correct ones in the
 filter.

 K3 is set up for 1.00 power out, as instructed.
 The fact that the overload LEDs are lighting up at the high end setting of
 the input attenuator leads me to believe that the IF in from the K3 is ok,
 and that both pre-filter amplifier stages are working as intended.
 Adjustments of FL1 and FL2 are smooth and have a clearly identifiable peak,
 leading me to believe those are ok.   I'm not seeing any voltage changes
 elsewhere in the transmit chain, and the rest of the device voltages look
 good.

 I made several attempts at alignment since your email, with no more success
 than earlier.  As I am concerned that the PA module may be flaky, rather
 than fry the thing by continuing to tune, it's going back to Elecraft on
 Monday for them to have a look.  I'll follow up here with the results.

 Thanks again for your quick response.

 73,

 Don Appleby   W3MW
 w...@earthlink.net

 - Original Message -
 From: Don Wilhelmw3...@embarqmail.com
 To: W3MW Donw...@earthlink.net
 Cc:elecraft@mailman.qth.net
 Sent: Saturday, August 06, 2011 5:15 PM
 Subject: Re: [Elecraft] XV432 Issues


 Don,

 The manual doesn't state that you must adjust for 10 volts at TP5.
 Please read that section again.

 It does say that you should not exceed 10 volts at TP5 during the
 bandpass filter tuning.
 If the output goes above 10 volts, use the input attenuator R22) to
 bring the voltage down - perhaps in the vicinity of 5 volts, and then
 continue to look for the peak tuning point for each inductor that is to
 be adjusted.
 Go back over the peaking procedure 3 or 4 times.

 After you have peaked the bandpass filters, you will then adjust the
 input attenuator to produce the correct output (use an external power
 meter which is accurate at 432 MHz) while your selected maximum drive
 level is applied from your transceiver.

 After that (and while the transverter is producing 20 watts), you adjust
 R10 (Power CAL) so the LEDs indicate 20 watts.

 These 3 steps must be done in order - do not skip ahead or you will end
 up with frustration.  Also, do not drive the transverter for too long at
 a time - particularly during the final power adjustments.  Give enough
 break time to let it cool between adjustment trials.

 73,
 Don W3FPR


 On 8/6/2011 3:27 PM, W3MW Don wrote:
 I've just finished assembly of the XV432 kit, interfaced to a K3, and ran
 into two issues during alignment in Part VI, Filter Alignment.

 First, during CW key-down, the voltage at TP5 peaks immediately, then
 slowly drops off until it is a volt or more lower than peak.  Immediately
 re-keying gets a somewhat higher voltage than at un-key, but not at the
 peak.  Letting it sit a minute or two, then re-keying, gets the original
 peak voltage back.  Output power does the same fade.

 Second, the 28 MHz filters don't seem to be aligning properly.  I've set
 the cans at the set-points in the manual, but L15 and L16 seem to peak
 with the slugs out of the cans.  L17 appears to peak ok, and the 432
 filters both seem to peak fine.  At the best point of alignment, I am
 getting less than 7 volts at TP5, vs, 10 required for full output.  I've
 checked the K3 output, and the BNC cables, both are fine.  The input
 section of the XV is easily able to overdrive the input to the 28 MHz
 filters, as evidenced by D10 and D11 lighting up at roughly half setting
 on the input attenuator.  Max output from

Re: [Elecraft] XV432 Issues

[Dale Putnam]

L
Have a great day, 
Dale - WC7S

-Original Message-
From: Don Wilhelm w3...@embarqmail.com
Date: Sat, 6 Aug 2011 21:15:40 
To: w...@earthlink.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] XV432 Issues

Don,

The manual doesn't state that you must adjust for 10 volts at TP5.  
Please read that section again.

It does say that you should not exceed 10 volts at TP5 during the 
bandpass filter tuning.
If the output goes above 10 volts, use the input attenuator R22) to 
bring the voltage down - perhaps in the vicinity of 5 volts, and then 
continue to look for the peak tuning point for each inductor that is to 
be adjusted.
Go back over the peaking procedure 3 or 4 times.

After you have peaked the bandpass filters, you will then adjust the 
input attenuator to produce the correct output (use an external power 
meter which is accurate at 432 MHz) while your selected maximum drive 
level is applied from your transceiver.

After that (and while the transverter is producing 20 watts), you adjust 
R10 (Power CAL) so the LEDs indicate 20 watts.

These 3 steps must be done in order - do not skip ahead or you will end 
up with frustration.  Also, do not drive the transverter for too long at 
a time - particularly during the final power adjustments.  Give enough 
break time to let it cool between adjustment trials.

73,
Don W3FPR


On 8/6/2011 3:27 PM, W3MW Don wrote:
 I've just finished assembly of the XV432 kit, interfaced to a K3, and ran 
 into two issues during alignment in Part VI, Filter Alignment.

 First, during CW key-down, the voltage at TP5 peaks immediately, then slowly 
 drops off until it is a volt or more lower than peak.  Immediately re-keying 
 gets a somewhat higher voltage than at un-key, but not at the peak.  Letting 
 it sit a minute or two, then re-keying, gets the original peak voltage back.  
 Output power does the same fade.

 Second, the 28 MHz filters don't seem to be aligning properly.  I've set the 
 cans at the set-points in the manual, but L15 and L16 seem to peak with the 
 slugs out of the cans.  L17 appears to peak ok, and the 432 filters both seem 
 to peak fine.  At the best point of alignment, I am getting less than 7 volts 
 at TP5, vs, 10 required for full output.  I've checked the K3 output, and the 
 BNC cables, both are fine.  The input section of the XV is easily able to 
 overdrive the input to the 28 MHz filters, as evidenced by D10 and D11 
 lighting up at roughly half setting on the input attenuator.  Max output from 
 the PA is around 15 watts without lighting up D10 and D11.  I've pulled and 
 checked the five caps around the filters, all are within tolerance.  
 Oscillator alignment was fine, 3v at TP1.  I've tried re-aligning these three 
 cans several times, including bottoming out the slugs and working back up, 
 with no change.

 I'm on the air with it at the moment, and it seems to be working other than 
 the low power output.

 Any thoughts?

 Don   W3MW


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Re: [Elecraft] XV432 Oscillates with Amp connected - FIXED

[Ian White GM3SEK]

Stu2 wrote:

1) Make sure the paint on the inside of the case was removed in the
appropriate spots (connectors, joints, etc.)

A stainless steel scratch pen is your best friend -

USA:http://www.cooltools.us/Scratch-Brush-Pen-Style-Steel-p/brn-209.htm

UK: 
http://www.eileensemporium.com/index.php?option=com_virtuemartpage=shop
.browsecategory_id=1Itemid=9

Use the centre hole of a large steel washer to isolate the area you want 
to clean. Don't stop when the black paint has gone - make sure you also 
cut away the primer, which is very tough and not so easy to see.


-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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Re: [Elecraft] XV432 Oscillates with Amp connected - FIXED

[Stu2]

Well - probably not fixed, but I was able to find a workaround.

If you haven't been following this thread, the basic issue is that the 
PA on my XV432 self oscillates. Thanks to everybody on the list, 
including Gary from Elecraft, I had several different things to try.

1) Make sure the paint on the inside of the case was removed in the 
appropriate spots (connectors, joints, etc.)
2) Add some vias near U6 and K2
3) Touch up the solder joints
4) Make sure the leads on the resistor specified in the XV432 mod was as 
short as possible
5) Change the PA Bias Adj
6) Add a pad in the TX path between the amp and XV432
7) Add a power resistor on a T connector at the XV432 output (or Amp input)

Ultimately, I found that varying the length of the coax between the 
XV432 and Henry 2004A was the answer.  I discovered this when I got to 
idea #7. First, I used a Bird Watt meter and adjusted the Henry amp to 
match my TS2000. (no reflected power) Then I reconnected the XV432. I 
added a 50ohm 20W dummy load on a BNC T at the output of the XV432 with 
a bunch of different adapters to make the N-BNC connection work. The 
XV432 was still connected to the Henry. This essentially put the dummy 
load in parallel with the Amp. The self oscillation stopped.

So I removed the dummy load to prove the hypothesis and still no 
oscillation. Then I renewed my original track of varying the coax 
lengths and stumbled on a good length, which stopped the self oscillations.

I know the length of cable changes the load. So it would seem the next 
step might be developing a simple matching network at the output of the 
XV432. But since I don't know all the variables (e.g. S parameters) this 
would probably need to be trial and error with some good guess work.

Thanks to everybody on the list who helped out. Perhaps I'll see you in 
Dayton.

73's

Stu2
W7IY
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Re: [Elecraft] XV432 Oscillates with Amp connected - FIXED

[Don Wilhelm]

  Stu,

Since the length of the coax changes things, I would suggest putting the 
matching circuit at the Amp end of the cable rather than the XV432.  The 
cable length should not matter if it is matched at the amplifier end, 
but since the length does change things, it is apparent to me that the 
amp input does not present a 50 ohm load.

73,
Don W3FPR

On 5/16/2011 5:50 PM, Stu2 wrote:
 Well - probably not fixed, but I was able to find a workaround.

 If you haven't been following this thread, the basic issue is that the
 PA on my XV432 self oscillates. Thanks to everybody on the list,
 including Gary from Elecraft, I had several different things to try.

 1) Make sure the paint on the inside of the case was removed in the
 appropriate spots (connectors, joints, etc.)
 2) Add some vias near U6 and K2
 3) Touch up the solder joints
 4) Make sure the leads on the resistor specified in the XV432 mod was as
 short as possible
 5) Change the PA Bias Adj
 6) Add a pad in the TX path between the amp and XV432
 7) Add a power resistor on a T connector at the XV432 output (or Amp input)

 Ultimately, I found that varying the length of the coax between the
 XV432 and Henry 2004A was the answer.  I discovered this when I got to
 idea #7. First, I used a Bird Watt meter and adjusted the Henry amp to
 match my TS2000. (no reflected power) Then I reconnected the XV432. I
 added a 50ohm 20W dummy load on a BNC T at the output of the XV432 with
 a bunch of different adapters to make the N-BNC connection work. The
 XV432 was still connected to the Henry. This essentially put the dummy
 load in parallel with the Amp. The self oscillation stopped.

 So I removed the dummy load to prove the hypothesis and still no
 oscillation. Then I renewed my original track of varying the coax
 lengths and stumbled on a good length, which stopped the self oscillations.

 I know the length of cable changes the load. So it would seem the next
 step might be developing a simple matching network at the output of the
 XV432. But since I don't know all the variables (e.g. S parameters) this
 would probably need to be trial and error with some good guess work.

 Thanks to everybody on the list who helped out. Perhaps I'll see you in
 Dayton.

 73's

 Stu2
 W7IY

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[Elecraft] XV432 Oscillates with Amp connected

[Edward R. Cole]

Stu,

OK so you are keying the XV432 Tx control line and not applying RF 
drive (not sure how you accomplish this, but not important in this 
discussion).  It oscillated unless there is a 50-ohm RF load on the output.

I think its time to contact Elecraft for help.  I assume you did not 
build the XV432 and it was assembled by Elecraft (what I am saying 
this is not sold as a kit), and should not do this.  Maybe a 
candidate for warranty service.

I had a 1296 transverter (from another mfr) that did a similar thing 
though it took drive to get self-osc. started.  I could remove drive 
and still had a couple watts of RF out, until I unkeyed it from 
Tx.  Unkeying biased the amps off in the transverter.  I measured the 
self-osc. frequency and it was osc. at operating freq.  The mfr had 
it twice to fix and finally we got it tamed at a lower power out (and 
I sold it).

But circuits can self-osc. anywhere from audio to mw.  There are 
design techniques to prevent this: usually RF chokes and bypass 
caps.  In tough cases interstage shielding and parasitic chokes.  But 
I have not heard of this problem being common with the XV432 so time 
to call Elecraft.

Ed - KL7UW
--

Message: 17
Date: Tue, 10 May 2011 19:19:50 -0400
From: Stu2 s...@stu2.net
Subject: Re: [Elecraft] XV432 Oscillates with Amp connected
To: elecraft@mailman.qth.net
Message-ID: 4dc9c816.6020...@stu2.net
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Thanks guys!

It's quite weird. When I say key up, I mean activate the XV432 PTT with
the rig (exciter) in CW mode without pressing the CW key.  That is, no
RF goes into the transverter. Just the simple fact of keying the
transverter while it is connected to something other than a 50 Ohm load
seems to set up an oscillation.

Several people have suggested a pad. The output of the XV432 is a low
pass pi circuit. Since I don't want to reduce the RX gain, it would seem
this either needs to be in the amp's TX chain or the XV432's TX chain.
(i.e. before the TR relay)

After I wrote my first message, I installed an SWR meter between the
XV432 and amp so I could adjust the Henry for the best SWR.
Unfortunately, this didn't cure the problem. The XV432 still oscillated.
I have another amp I can try. I also have a TS2000 to try to help set
the amp up.

Thanks again for the ideas.

Stu2





73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
DUBUS Magazine USA Rep dubus...@hotmail.com
==
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Re: [Elecraft] XV432 Oscillates with Amp connected

[Colin VE3MSC]

Stu - Three more suggestions:
- remove the paint along the inside edges of the box where the lids 
meet the box sides and the C shaped front/back panels, and remove the 
paint under the screw heads (I used a dremel bit to grind a nice 
circle under the head).
  - try increasing the PA Bias a bit, so that you are reading 30-40mV 
instead of 20mV at the test points TP3/4. Gary S suggested this.
- replace the grey heatsink thermal pads with Thermalcote conductive 
heatsink grease.  In my case, this stabilized the power output over 
time, as well as improved the output instability.

I also had done the PCBoard mod to ground top/bottom sides near the 
relay down in front, suggested by someone else.

I was able to work a handful for the spring sprint - including Steve 
VE3SMA - as a result of these changes.

Good luck
Colin Haig VE3MSC

At 07:19 PM 2011-05-10, Stu2 wrote:
Thanks guys!

It's quite weird. When I say key up, I mean activate the XV432 PTT with
the rig (exciter) in CW mode without pressing the CW key.  That is, no
RF goes into the transverter. Just the simple fact of keying the
transverter while it is connected to something other than a 50 Ohm load
seems to set up an oscillation.

Several people have suggested a pad. The output of the XV432 is a low
pass pi circuit. Since I don't want to reduce the RX gain, it would seem
this either needs to be in the amp's TX chain or the XV432's TX chain.
(i.e. before the TR relay)

After I wrote my first message, I installed an SWR meter between the
XV432 and amp so I could adjust the Henry for the best SWR.
Unfortunately, this didn't cure the problem. The XV432 still oscillated.
I have another amp I can try. I also have a TS2000 to try to help set
the amp up.

Thanks again for the ideas.

Stu2
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Re: [Elecraft] XV432 Oscillates with Amp connected

[John Huggins, kx4o]

All the suggestions about trying different cable lengths are good thoughts
to help find the sweet spot of compatibility between the XV432 output
circuit impedance and the Henry input impedance.

Folks on the repeater-builder group talk about this very issue often; Of
course in their case they are concerned about the transmitter feeding a
reactive duplexer assembly.  Oscillations don't seem to be the issue
presented, rather, the tendency of the transmitter output stage to produce
other by-products when forced to feed a reactive load, such as a narrow
band-pass duplexer, causes unhappiness in the transmitter.  Spurious
signals are the result.

The oft touted simple cure proposed is try different lengths of cable
between TX and Combiner.

The more professional solution is to place an Isolator between the TX and
the Amp during transmit.  One example is shown here...

  http://www.rflambda.com/pdf/isolator/RFLI101M40M50.pdf

This way, the TX only ever sees a nice infinite coax assuming, of course,
the third port is properly terminated into 50 ohms.

Of course you need to receive as well and the isolator won't help with
that by itself.  So all I have done here is to propose a workable, but
unwieldy and expensive solution if, in fact, the cause of the oscillations
is impedance issues between the XV432 output stage and the Henry input
stage.

The point is impedance issues between a Source and Load can cause the
source to not play nice.

Let's hope your problem is just a feedback path solved with chokes.

John

 Good day,

 I'm working with the XV432, Flex 1500 and Henry  2004A Amp. The rig,
xvrtr and amp PTTs are sequenced. Hoping somebody might have been down
this path before and has a solution.

 If I connect the transverter output to the amp (or different pieces of
open coax) and key the transverter, the power meter goes full scale and I
see an oscillation on the spectrum analyzer. The frequency of the
oscillation varies with the load. (i.e. amp connected or different lengths
of coax) If I connect the XV432 to a 50 ohm load, no
 oscillations and all works well.

 I ran through the alignment procedure again with the XV432 connected to
a 50 Ohm load. All the voltages look right and the tuning is smooth. (e.g.
20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 is
happy into 50 Ohms, but not into impedances that wander from 50 Ohms.

 BTW, I have added all the mods as per the Elecraft website.

 Any ideas?

 73's
 Stu2
 W7IY
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Re: [Elecraft] XV432 Oscillates with Amp connected

[Stu2]

Thanks guys!

It's quite weird. When I say key up, I mean activate the XV432 PTT with 
the rig (exciter) in CW mode without pressing the CW key.  That is, no 
RF goes into the transverter. Just the simple fact of keying the 
transverter while it is connected to something other than a 50 Ohm load 
seems to set up an oscillation.

Several people have suggested a pad. The output of the XV432 is a low 
pass pi circuit. Since I don't want to reduce the RX gain, it would seem 
this either needs to be in the amp's TX chain or the XV432's TX chain. 
(i.e. before the TR relay)

After I wrote my first message, I installed an SWR meter between the 
XV432 and amp so I could adjust the Henry for the best SWR. 
Unfortunately, this didn't cure the problem. The XV432 still oscillated. 
I have another amp I can try. I also have a TS2000 to try to help set 
the amp up.

Thanks again for the ideas.

Stu2
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Re: [Elecraft] XV432 Oscillates with Amp connected

[Steve Kavanagh]

Stu

A couple of thoughts.

You didn't mention if the oscillation was occurring with the amp driving an 
antenna or a dummy load.  The Elecraft transverters have lots of nice features 
but they are quite poorly shielded.  If you were using an antenna you might be 
getting an RF feedback loop via the various rear-panel connectors which rely on 
the PC board for grounding rather than the case.  Clip on ferrite beads on the 
cables can help.  If you were running the amp into a dummy load then the 
problem is more likely impedance related as you suggested.

When I built my XV222 the manual failed to suggest that the paint be scraped 
off the case where the output coax connector is attached.  If you haven't 
already done this, it might be worth a try just to ensure proper grounding.

73,
Steve VE3SMA
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Re: [Elecraft] XV432 Oscillates with Amp connected

[w2bvh]

  On 5/9/2011 6:32 AM, Steve Kavanagh wrote:
 Stu

 A couple of thoughts.

 You didn't mention if the oscillation was occurring with the amp driving an 
 antenna or a dummy load.  The Elecraft transverters have lots of nice 
 features but they are quite poorly shielded.  If you were using an antenna 
 you might be getting an RF feedback loop via the various rear-panel 
 connectors which rely on the PC board for grounding rather than the case.  
 Clip on ferrite beads on the cables can help.  If you were running the amp 
 into a dummy load then the problem is more likely impedance related as you 
 suggested.

 When I built my XV222 the manual failed to suggest that the paint be scraped 
 off the case where the output coax connector is attached.  If you haven't 
 already done this, it might be worth a try just to ensure proper grounding.
*Likewise, try scraping paint off the four 2-D attachment points on both 
the side panels. The paint is very tough and hard to remove but its 
worth the work. --Lenny W2BVH*

 73,
 Steve VE3SMA
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[Elecraft] XV432 Oscillates with Amp connected

[Edward R. Cole]

First off let me state that I do not have any of the equipment Stu is 
using.  The fact the XV432 likes the 50-ohm termination (dummy load 
to the rest of us), says it looks like a termination loading 
issue.  The Henry 2004 should offer a 50-ohm load at input.  Some 
amps require input tuning (my 2m-8877 is very touchy on input tuning 
and does not present a low SWR; best I get is 1.7:1).  My amp is HB 
so I know why.  Transmitting into open unterminated coax will 
normally show standing wave peaks and valleys.  But perhaps the XV432 
is going into self-oscillation when not seeing a good load?

If you have enough excess power I would suggest using a 3-dB 
attenuator between the XV432 and Henry amp.  It will have to be rated 
for full power of the XV432.  Many amps even have an internal 
attenuator on the input (mainly to broadband input tuning).

Do you have another 432 transmitter to test with the Henry 
amp?  Also, try different lengths of coax between the XV432 and the 
amp.  Oh, and test those coax lines with the 50-ohm termination on 
the far end (should see no oscillation or SWR).

If the XV432 is going into self-oscillation it might be RF feedback 
from the Henry amp thru power lines?  Try moving the XV432 dc cables 
to see if that causes any effect.  If so wrapping the dc cord thru a 
toroid core may help (also check that there is RF bypassing inside 
the XV432 on the dc input.  Should see a bypass cap and maybe 
ferriite beads on the dc line.  Check station grounding.  That Henry 
needs a good RF and safety ground to an external ground post and 
house wiring ground (this has been a recent topic).

Have you tested with the Henry into a 50-ohm termination (dummy 
load)?   High SWR on the antenna can also produce these effects with 
a high-power amp.  (of course no all of us have a QRO dummy load)  I 
have a 500w Sierra Electronics air cooled load that will sustain up 
to 1000w for quick checks (no sustained key-down).  At 1500w, I 
usually use my 2m eme array as best load (on a clear freq.).

GL, Ed - KL7UW

--

Message: 2
Date: Sun, 08 May 2011 13:34:55 -0400
From: Stu2 s...@stu2.net
Subject: [Elecraft] XV432 Oscillates with Amp connected
To: elecraft@mailman.qth.net
Message-ID: 4dc6d43f.2090...@stu2.net
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Good day,

I'm working with the XV432, Flex 1500 and Henry  2004A Amp. The rig,
xvrtr and amp PTTs are sequenced. Hoping somebody might have been down
this path before and has a solution.

If I connect the transverter output to the amp (or different pieces of
open coax) and key the transverter, the power meter goes full scale and
I see an oscillation on the spectrum analyzer. The frequency of the
oscillation varies with the load. (i.e. amp connected or different
lengths of coax) If I connect the XV432 to a 50 ohm load, no
oscillations and all works well.

I ran through the alignment procedure again with the XV432 connected to
a 50 Ohm load. All the voltages look right and the tuning is smooth.
(e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432
is happy into 50 Ohms, but not into impedances that wander from 50 Ohms.

BTW, I have added all the mods as per the Elecraft website.

Any ideas?

73's
Stu2
W7IY





73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
DUBUS Magazine USA Rep dubus...@hotmail.com
==
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Re: [Elecraft] XV432 Oscillates with Amp connected

[Thomas Ries]

Hello Stu2,

Some time ago, I had problems with an oscillating (or at the tip of
starting self-oscillation) XV432. It manifested in such a way, the XV432
being very sensitive to input power levels and jumpy output power when
adjusting the power level. Together with a Mirage D1010 (100W 70cm PA)
sometimes oscillation at full power has been observed.

In my case I could track it down to 70cm HF being coupled back into the
IF (TX IF towards the XV432) causing a feedback. I could eliminate the
oscillation by 2 modifications:

1) Added both the Elecraft Erratas to eliminate oscillation on the PA
   hybrid module (one is about installing a coil and a second one about
   installing a series resistor). Note that the errata to install the
   series resistor seems to superseede the coil, in my case installing
   both of the modifications did improve stability.

2) Install a small low-pass filter in the TX IF input in the XV432,
   as described here: www.dl7maj.de/XV432-Mod.pdf
   I installed the filter on board of the XV432, as shown in the
   PDF above. Note that I drive my XV432 from a K3 with 0dBm power.

With the above modifications no oscillation or instability in output
power has been seen anymore.

I hope this may help.

Best 73 de Thomas, HB9XAR

Stu2 wrote:
 Good day,
 
 I'm working with the XV432, Flex 1500 and Henry  2004A Amp. The rig, 
 xvrtr and amp PTTs are sequenced. Hoping somebody might have been down 
 this path before and has a solution.
 
 If I connect the transverter output to the amp (or different pieces of 
 open coax) and key the transverter, the power meter goes full scale and 
 I see an oscillation on the spectrum analyzer. The frequency of the 
 oscillation varies with the load. (i.e. amp connected or different 
 lengths of coax) If I connect the XV432 to a 50 ohm load, no 
 oscillations and all works well.
 
 I ran through the alignment procedure again with the XV432 connected to 
 a 50 Ohm load. All the voltages look right and the tuning is smooth. 
 (e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 
 is happy into 50 Ohms, but not into impedances that wander from 50 Ohms.
 
 BTW, I have added all the mods as per the Elecraft website.
 
 Any ideas?
 
 73's
 Stu2
 W7IY
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Re: [Elecraft] XV432 Oscillates with Amp connected

[M Cresap]

I had a similar problem with my XV432. I was able to chase the problem to the 
tx 
driver stage. The fix was to add ground vias from the top to the bottom of the 
board in a few judicious places. I passed this info back to Gary at Elecraft. I 
know of at least one other XV432 that has been stabilized by this method. I 
don't see those mods in the latest XV432 errata sheet, perhaps they vias have 
been added to the latest circuit board or they have found other ways to cure 
the 
problem.

73, Mike, W3IP





From: Edward R. Cole kl...@acsalaska.net
To: Elecraft@mailman.qth.net
Sent: Mon, May 9, 2011 12:46:11 PM
Subject: [Elecraft] XV432 Oscillates with Amp connected

First off let me state that I do not have any of the equipment Stu is 
using.  The fact the XV432 likes the 50-ohm termination (dummy load 
to the rest of us), says it looks like a termination loading 
issue.  The Henry 2004 should offer a 50-ohm load at input.  Some 
amps require input tuning (my 2m-8877 is very touchy on input tuning 
and does not present a low SWR; best I get is 1.7:1).  My amp is HB 
so I know why.  Transmitting into open unterminated coax will 
normally show standing wave peaks and valleys.  But perhaps the XV432 
is going into self-oscillation when not seeing a good load?

If you have enough excess power I would suggest using a 3-dB 
attenuator between the XV432 and Henry amp.  It will have to be rated 
for full power of the XV432.  Many amps even have an internal 
attenuator on the input (mainly to broadband input tuning).

Do you have another 432 transmitter to test with the Henry 
amp?  Also, try different lengths of coax between the XV432 and the 
amp.  Oh, and test those coax lines with the 50-ohm termination on 
the far end (should see no oscillation or SWR).

If the XV432 is going into self-oscillation it might be RF feedback 
from the Henry amp thru power lines?  Try moving the XV432 dc cables 
to see if that causes any effect.  If so wrapping the dc cord thru a 
toroid core may help (also check that there is RF bypassing inside 
the XV432 on the dc input.  Should see a bypass cap and maybe 
ferriite beads on the dc line.  Check station grounding.  That Henry 
needs a good RF and safety ground to an external ground post and 
house wiring ground (this has been a recent topic).

Have you tested with the Henry into a 50-ohm termination (dummy 
load)?  High SWR on the antenna can also produce these effects with 
a high-power amp.  (of course no all of us have a QRO dummy load)  I 
have a 500w Sierra Electronics air cooled load that will sustain up 
to 1000w for quick checks (no sustained key-down).  At 1500w, I 
usually use my 2m eme array as best load (on a clear freq.).

GL, Ed - KL7UW

--

Message: 2
Date: Sun, 08 May 2011 13:34:55 -0400
From: Stu2 s...@stu2.net
Subject: [Elecraft] XV432 Oscillates with Amp connected
To: elecraft@mailman.qth.net
Message-ID: 4dc6d43f.2090...@stu2.net
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Good day,

I'm working with the XV432, Flex 1500 and Henry  2004A Amp. The rig,
xvrtr and amp PTTs are sequenced. Hoping somebody might have been down
this path before and has a solution.

If I connect the transverter output to the amp (or different pieces of
open coax) and key the transverter, the power meter goes full scale and
I see an oscillation on the spectrum analyzer. The frequency of the
oscillation varies with the load. (i.e. amp connected or different
lengths of coax) If I connect the XV432 to a 50 ohm load, no
oscillations and all works well.

I ran through the alignment procedure again with the XV432 connected to
a 50 Ohm load. All the voltages look right and the tuning is smooth.
(e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432
is happy into 50 Ohms, but not into impedances that wander from 50 Ohms.

BTW, I have added all the mods as per the Elecraft website.

Any ideas?

73's
Stu2
W7IY





73, Ed - KL7UW, WD2XSH/45
==
BP40IQ  500 KHz - 10-GHz  www.kl7uw.com
EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
DUBUS Magazine USA Rep dubus...@hotmail.com
==
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[Elecraft] XV432 Oscillates with Amp connected

[Stu2]

Good day,

I'm working with the XV432, Flex 1500 and Henry  2004A Amp. The rig, 
xvrtr and amp PTTs are sequenced. Hoping somebody might have been down 
this path before and has a solution.

If I connect the transverter output to the amp (or different pieces of 
open coax) and key the transverter, the power meter goes full scale and 
I see an oscillation on the spectrum analyzer. The frequency of the 
oscillation varies with the load. (i.e. amp connected or different 
lengths of coax) If I connect the XV432 to a 50 ohm load, no 
oscillations and all works well.

I ran through the alignment procedure again with the XV432 connected to 
a 50 Ohm load. All the voltages look right and the tuning is smooth. 
(e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 
is happy into 50 Ohms, but not into impedances that wander from 50 Ohms.

BTW, I have added all the mods as per the Elecraft website.

Any ideas?

73's
Stu2
W7IY
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Re: [Elecraft] XV432 Alignment Problems - Help!

[Mark Adams]

Gang,

Per Don's suggestion, I have forwarded all info to E-Support. One more thing
for here. I have summarized my Troubleshooting voltages.

The following numbers that are not consistent with the charts.

RF PWR Module, U7, Pin 3, 2.5V in TX vs the stated 3.5-4.5

TP1, 3.6V in Rx and 3.5 in Tx vs 2.2 Nominal in both modes.
TP5, 0V in TX
TP6, 0V in TX

U1 Output pin, 1.9V in Rx and 0V in Tx vs stated 3.0-6.0.


73,
Mark K2QO
FN03ra



On Sun, Sep 5, 2010 at 10:08 PM, Robert Friess rfri...@usa.net wrote:

 Mark,

 Even though TP5 is zero, do you measure power output power with an external
 meter?  What do you see at TP6 (marked TP5 on the schematic.  TP6 is at the
 input of the gain block)

 Bob

 On Sun, Sep 5, 2010 at 5:48 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Mark,

 I am out of help on that one.  If you have not already, it is time to
 email support at elecraft dot com.

 73,
 Don W3FPR

 On 9/5/2010 6:46 PM, Mark Adams wrote:
  Don,
 
  I rearranged the XV432 to be driven at 5W with my FT817 (my uW IF
 radio).
  Now, all the tests up to the one originally in question, were fine. I
 still
  have 0 Volts at TP5.
 
  What is new: When I rotate R22 CW while feeding 5W from the 817, at
 about
  25% rotation of R22, the overload LEDs on the main board light. I
 rechecked
  the pin headers and shorting blocks and they are correct.
 
  Myron,
 
  You suggested the following:
 
  1.  Check the bias voltage to the PA.  TP5 samples the PA output.  Is
 the
  bias voltage still the same as when you set it previously.
 
  YES.
 
  2.  Check the local LO.  If your adjustment of that stage ended up right
 on
  the edge, sometimes it will stop oscillating and will need
 re-adjustment.
 
  The LO starts AOK each time I power it up.
 
  3.  Make sure the XVTR is in transmit mode while making these
 adjustments.
 
  YES. It was. All set there.
 
  I found that some adjustments when peaking TP5 voltage didn't seem to do
  much.  Even sometimes a bad coax between the rig IF and the XVTR can
 cause
  systems like you describe.
 
  I tried 2 different coax jumpers with no change.
 
  73,
  Mark K2QO
  FN03ra
 
 
 
  On Sun, Sep 5, 2010 at 5:13 PM, Don Wilhelmw3...@embarqmail.com
  wrote:
 
Mark,
 
  I am going to guess that you are plagued with the gremlin of 432 MHz
 energy
  getting back to the K60XV and interfering with its power measurement
  mechanism.
 
  Plug the XV432 for high power input and drive it from the BNC on the K2
  until you get it aligned.
  If all goes well when connected that way, put a 30 or 50 MHz low pass
  filter between the K60XV output and the transverter(s).  One of the
 little
  in-line Mini-Circuits filters works well.
 
  73,
  Don W3FPR
 
 
  On 9/5/2010 4:54 PM, Mark Adams wrote:
 
  Hi Gang,
 
  Just finished my XV432 expecting to use it next weekend in the ARRL
 VHF in
  my rover setup. Murphy has hit and maybe someone can give me a hand.
 
  My setup is a K2/XV60/IO module running xverter duty with an XV222
 using
  the
  split IF, Elecraft control cable, etc. I've used this for a few years
 and
  it
  works FB.
 
  Now for the XV432. I am on page 29 running Part VI-Filter Alignment.
 All
  is
  good up to the last checkbox at the bottom right of the page. I key
 the
  rig
  and get a 2V. On page 30, I continue with adjustment of L15, L16, L17.
 The
  readings are changing as expected. Then I go on to FL1 and FL2 to get
 a
  higher reading at TP5. At the first FL and turn of the screw, the
 voltage
  at
  TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked
 to
  make
  sure the K2 is putting out power and I have milliVolts at the TX in
  connector.
 
  I did use a small metal Stanley screwdriver to make the fateful
  adjustment,
  but cannot see how this might matter. It would help to have a bunch of
 RF
  voltages to check to determine my problem.
 
  If I do not have this up and running by Thursday, my big rove plans
 will
  be
  shot as I've revamped the rover setup to include this transverter.
 
 
  73,
  Mark K2QO
  FN03ra
 
 
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Re: [Elecraft] XV432 Alignment Problems - Help!

[Mark Adams]

Robert,


 What DC voltage do you measure at the output pin of U6.

5.0V in TX


 Are you able to set the bias current of U7 with R39 as stated in the
 manual?

Yes, no problem



 Does the receive side work?

Yes, I think. When I turn on the Elecraft N-Gen the noise goes a lot.


 Bob

 On Mon, Sep 6, 2010 at 12:34 PM, Mark Adams msadam...@gmail.com wrote:

 Gang,

 Per Don's suggestion, I have forwarded all info to E-Support. One more
 thing for here. I have summarized my Troubleshooting voltages.

 The following numbers that are not consistent with the charts.

 RF PWR Module, U7, Pin 3, 2.5V in TX vs the stated 3.5-4.5

 TP1, 3.6V in Rx and 3.5 in Tx vs 2.2 Nominal in both modes.
 TP5, 0V in TX
 TP6, 0V in TX

 U1 Output pin, 1.9V in Rx and 0V in Tx vs stated 3.0-6.0.


 73,
 Mark K2QO
 FN03ra



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Re: [Elecraft] XV432 Alignment Problems - Help!

[Mark Adams]

Robert,

One more thing on the last tests. I WAS able to peak up FL1 and C1 on RX
with the N-Gen.

73,
Mark K2QO
FN03ra



On Mon, Sep 6, 2010 at 5:23 PM, Mark Adams msadam...@gmail.com wrote:

 Robert,


 What DC voltage do you measure at the output pin of U6.

 5.0V in TX


 Are you able to set the bias current of U7 with R39 as stated in the
 manual?

 Yes, no problem



 Does the receive side work?

 Yes, I think. When I turn on the Elecraft N-Gen the noise goes a lot.


 Bob

 On Mon, Sep 6, 2010 at 12:34 PM, Mark Adams msadam...@gmail.com wrote:

 Gang,

 Per Don's suggestion, I have forwarded all info to E-Support. One more
 thing for here. I have summarized my Troubleshooting voltages.

 The following numbers that are not consistent with the charts.

 RF PWR Module, U7, Pin 3, 2.5V in TX vs the stated 3.5-4.5

 TP1, 3.6V in Rx and 3.5 in Tx vs 2.2 Nominal in both modes.
 TP5, 0V in TX
 TP6, 0V in TX

 U1 Output pin, 1.9V in Rx and 0V in Tx vs stated 3.0-6.0.


 73,
 Mark K2QO
 FN03ra




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[Elecraft] XV432 Alignment Problems - Help!

[Mark Adams]

Hi Gang,

Just finished my XV432 expecting to use it next weekend in the ARRL VHF in
my rover setup. Murphy has hit and maybe someone can give me a hand.

My setup is a K2/XV60/IO module running xverter duty with an XV222 using the
split IF, Elecraft control cable, etc. I've used this for a few years and it
works FB.

Now for the XV432. I am on page 29 running Part VI-Filter Alignment. All is
good up to the last checkbox at the bottom right of the page. I key the rig
and get a 2V. On page 30, I continue with adjustment of L15, L16, L17. The
readings are changing as expected. Then I go on to FL1 and FL2 to get a
higher reading at TP5. At the first FL and turn of the screw, the voltage at
TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked to make
sure the K2 is putting out power and I have milliVolts at the TX in
connector.

I did use a small metal Stanley screwdriver to make the fateful adjustment,
but cannot see how this might matter. It would help to have a bunch of RF
voltages to check to determine my problem.

If I do not have this up and running by Thursday, my big rove plans will be
shot as I've revamped the rover setup to include this transverter.


73,
Mark K2QO
FN03ra
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Re: [Elecraft] XV432 Alignment Problems - Help!

[Don Wilhelm]

  Mark,

I am going to guess that you are plagued with the gremlin of 432 MHz 
energy getting back to the K60XV and interfering with its power 
measurement mechanism.

Plug the XV432 for high power input and drive it from the BNC on the K2 
until you get it aligned.
If all goes well when connected that way, put a 30 or 50 MHz low pass 
filter between the K60XV output and the transverter(s).  One of the 
little in-line Mini-Circuits filters works well.

73,
Don W3FPR

On 9/5/2010 4:54 PM, Mark Adams wrote:
 Hi Gang,

 Just finished my XV432 expecting to use it next weekend in the ARRL VHF in
 my rover setup. Murphy has hit and maybe someone can give me a hand.

 My setup is a K2/XV60/IO module running xverter duty with an XV222 using the
 split IF, Elecraft control cable, etc. I've used this for a few years and it
 works FB.

 Now for the XV432. I am on page 29 running Part VI-Filter Alignment. All is
 good up to the last checkbox at the bottom right of the page. I key the rig
 and get a 2V. On page 30, I continue with adjustment of L15, L16, L17. The
 readings are changing as expected. Then I go on to FL1 and FL2 to get a
 higher reading at TP5. At the first FL and turn of the screw, the voltage at
 TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked to make
 sure the K2 is putting out power and I have milliVolts at the TX in
 connector.

 I did use a small metal Stanley screwdriver to make the fateful adjustment,
 but cannot see how this might matter. It would help to have a bunch of RF
 voltages to check to determine my problem.

 If I do not have this up and running by Thursday, my big rove plans will be
 shot as I've revamped the rover setup to include this transverter.


 73,
 Mark K2QO
 FN03ra

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Re: [Elecraft] XV432 Alignment Problems - Help!

[Mark Adams]

Don,

I rearranged the XV432 to be driven at 5W with my FT817 (my uW IF radio).
Now, all the tests up to the one originally in question, were fine. I still
have 0 Volts at TP5.

What is new: When I rotate R22 CW while feeding 5W from the 817, at about
25% rotation of R22, the overload LEDs on the main board light. I rechecked
the pin headers and shorting blocks and they are correct.

Myron,

You suggested the following:

1.  Check the bias voltage to the PA.  TP5 samples the PA output.  Is the
bias voltage still the same as when you set it previously.

YES.

2.  Check the local LO.  If your adjustment of that stage ended up right on
the edge, sometimes it will stop oscillating and will need re-adjustment.

The LO starts AOK each time I power it up.

3.  Make sure the XVTR is in transmit mode while making these adjustments.

YES. It was. All set there.

I found that some adjustments when peaking TP5 voltage didn't seem to do
much.  Even sometimes a bad coax between the rig IF and the XVTR can cause
systems like you describe.

I tried 2 different coax jumpers with no change.

73,
Mark K2QO
FN03ra



On Sun, Sep 5, 2010 at 5:13 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Mark,

 I am going to guess that you are plagued with the gremlin of 432 MHz energy
 getting back to the K60XV and interfering with its power measurement
 mechanism.

 Plug the XV432 for high power input and drive it from the BNC on the K2
 until you get it aligned.
 If all goes well when connected that way, put a 30 or 50 MHz low pass
 filter between the K60XV output and the transverter(s).  One of the little
 in-line Mini-Circuits filters works well.

 73,
 Don W3FPR


 On 9/5/2010 4:54 PM, Mark Adams wrote:

 Hi Gang,

 Just finished my XV432 expecting to use it next weekend in the ARRL VHF in
 my rover setup. Murphy has hit and maybe someone can give me a hand.

 My setup is a K2/XV60/IO module running xverter duty with an XV222 using
 the
 split IF, Elecraft control cable, etc. I've used this for a few years and
 it
 works FB.

 Now for the XV432. I am on page 29 running Part VI-Filter Alignment. All
 is
 good up to the last checkbox at the bottom right of the page. I key the
 rig
 and get a 2V. On page 30, I continue with adjustment of L15, L16, L17. The
 readings are changing as expected. Then I go on to FL1 and FL2 to get a
 higher reading at TP5. At the first FL and turn of the screw, the voltage
 at
 TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked to
 make
 sure the K2 is putting out power and I have milliVolts at the TX in
 connector.

 I did use a small metal Stanley screwdriver to make the fateful
 adjustment,
 but cannot see how this might matter. It would help to have a bunch of RF
 voltages to check to determine my problem.

 If I do not have this up and running by Thursday, my big rove plans will
 be
 shot as I've revamped the rover setup to include this transverter.


 73,
 Mark K2QO
 FN03ra


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Re: [Elecraft] XV432 Alignment Problems - Help!

[Don Wilhelm]

  Mark,

I am out of help on that one.  If you have not already, it is time to 
email support at elecraft dot com.

73,
Don W3FPR

On 9/5/2010 6:46 PM, Mark Adams wrote:
 Don,

 I rearranged the XV432 to be driven at 5W with my FT817 (my uW IF radio).
 Now, all the tests up to the one originally in question, were fine. I still
 have 0 Volts at TP5.

 What is new: When I rotate R22 CW while feeding 5W from the 817, at about
 25% rotation of R22, the overload LEDs on the main board light. I rechecked
 the pin headers and shorting blocks and they are correct.

 Myron,

 You suggested the following:

 1.  Check the bias voltage to the PA.  TP5 samples the PA output.  Is the
 bias voltage still the same as when you set it previously.

 YES.

 2.  Check the local LO.  If your adjustment of that stage ended up right on
 the edge, sometimes it will stop oscillating and will need re-adjustment.

 The LO starts AOK each time I power it up.

 3.  Make sure the XVTR is in transmit mode while making these adjustments.

 YES. It was. All set there.

 I found that some adjustments when peaking TP5 voltage didn't seem to do
 much.  Even sometimes a bad coax between the rig IF and the XVTR can cause
 systems like you describe.

 I tried 2 different coax jumpers with no change.

 73,
 Mark K2QO
 FN03ra



 On Sun, Sep 5, 2010 at 5:13 PM, Don Wilhelmw3...@embarqmail.com  wrote:

   Mark,

 I am going to guess that you are plagued with the gremlin of 432 MHz energy
 getting back to the K60XV and interfering with its power measurement
 mechanism.

 Plug the XV432 for high power input and drive it from the BNC on the K2
 until you get it aligned.
 If all goes well when connected that way, put a 30 or 50 MHz low pass
 filter between the K60XV output and the transverter(s).  One of the little
 in-line Mini-Circuits filters works well.

 73,
 Don W3FPR


 On 9/5/2010 4:54 PM, Mark Adams wrote:

 Hi Gang,

 Just finished my XV432 expecting to use it next weekend in the ARRL VHF in
 my rover setup. Murphy has hit and maybe someone can give me a hand.

 My setup is a K2/XV60/IO module running xverter duty with an XV222 using
 the
 split IF, Elecraft control cable, etc. I've used this for a few years and
 it
 works FB.

 Now for the XV432. I am on page 29 running Part VI-Filter Alignment. All
 is
 good up to the last checkbox at the bottom right of the page. I key the
 rig
 and get a 2V. On page 30, I continue with adjustment of L15, L16, L17. The
 readings are changing as expected. Then I go on to FL1 and FL2 to get a
 higher reading at TP5. At the first FL and turn of the screw, the voltage
 at
 TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked to
 make
 sure the K2 is putting out power and I have milliVolts at the TX in
 connector.

 I did use a small metal Stanley screwdriver to make the fateful
 adjustment,
 but cannot see how this might matter. It would help to have a bunch of RF
 voltages to check to determine my problem.

 If I do not have this up and running by Thursday, my big rove plans will
 be
 shot as I've revamped the rover setup to include this transverter.


 73,
 Mark K2QO
 FN03ra


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Re: [Elecraft] XV432 Alignment Problems - Help!

[Robert Friess]

Mark,

Even though TP5 is zero, do you measure power output power with an external
meter?  What do you see at TP6 (marked TP5 on the schematic.  TP6 is at the
input of the gain block)

Bob

On Sun, Sep 5, 2010 at 5:48 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Mark,

 I am out of help on that one.  If you have not already, it is time to
 email support at elecraft dot com.

 73,
 Don W3FPR

 On 9/5/2010 6:46 PM, Mark Adams wrote:
  Don,
 
  I rearranged the XV432 to be driven at 5W with my FT817 (my uW IF radio).
  Now, all the tests up to the one originally in question, were fine. I
 still
  have 0 Volts at TP5.
 
  What is new: When I rotate R22 CW while feeding 5W from the 817, at about
  25% rotation of R22, the overload LEDs on the main board light. I
 rechecked
  the pin headers and shorting blocks and they are correct.
 
  Myron,
 
  You suggested the following:
 
  1.  Check the bias voltage to the PA.  TP5 samples the PA output.  Is the
  bias voltage still the same as when you set it previously.
 
  YES.
 
  2.  Check the local LO.  If your adjustment of that stage ended up right
 on
  the edge, sometimes it will stop oscillating and will need re-adjustment.
 
  The LO starts AOK each time I power it up.
 
  3.  Make sure the XVTR is in transmit mode while making these
 adjustments.
 
  YES. It was. All set there.
 
  I found that some adjustments when peaking TP5 voltage didn't seem to do
  much.  Even sometimes a bad coax between the rig IF and the XVTR can
 cause
  systems like you describe.
 
  I tried 2 different coax jumpers with no change.
 
  73,
  Mark K2QO
  FN03ra
 
 
 
  On Sun, Sep 5, 2010 at 5:13 PM, Don Wilhelmw3...@embarqmail.com
  wrote:
 
Mark,
 
  I am going to guess that you are plagued with the gremlin of 432 MHz
 energy
  getting back to the K60XV and interfering with its power measurement
  mechanism.
 
  Plug the XV432 for high power input and drive it from the BNC on the K2
  until you get it aligned.
  If all goes well when connected that way, put a 30 or 50 MHz low pass
  filter between the K60XV output and the transverter(s).  One of the
 little
  in-line Mini-Circuits filters works well.
 
  73,
  Don W3FPR
 
 
  On 9/5/2010 4:54 PM, Mark Adams wrote:
 
  Hi Gang,
 
  Just finished my XV432 expecting to use it next weekend in the ARRL VHF
 in
  my rover setup. Murphy has hit and maybe someone can give me a hand.
 
  My setup is a K2/XV60/IO module running xverter duty with an XV222
 using
  the
  split IF, Elecraft control cable, etc. I've used this for a few years
 and
  it
  works FB.
 
  Now for the XV432. I am on page 29 running Part VI-Filter Alignment.
 All
  is
  good up to the last checkbox at the bottom right of the page. I key the
  rig
  and get a 2V. On page 30, I continue with adjustment of L15, L16, L17.
 The
  readings are changing as expected. Then I go on to FL1 and FL2 to get a
  higher reading at TP5. At the first FL and turn of the screw, the
 voltage
  at
  TP5 goes to 0. And that is all. I cannot get volts at TP5. I checked to
  make
  sure the K2 is putting out power and I have milliVolts at the TX in
  connector.
 
  I did use a small metal Stanley screwdriver to make the fateful
  adjustment,
  but cannot see how this might matter. It would help to have a bunch of
 RF
  voltages to check to determine my problem.
 
  If I do not have this up and running by Thursday, my big rove plans
 will
  be
  shot as I've revamped the rover setup to include this transverter.
 
 
  73,
  Mark K2QO
  FN03ra
 
 
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[Elecraft] XV432

[w2bvh]

Can any of  the owners of a XV432 comment on the frequency stability? 

Thanks.

--Lenny
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Re: [Elecraft] XV432

[AD6XY]

Not quite - but I can comment on the XV144. The stability is OK with the
crystal oven though not exceptional. It need to be left on all the time or
it will take a while to settle on power up. There is a jumper for that.

The XV432 is likely to be approximately 3x less stable than the XV144.

Mike

 

w2bvh wrote:
 
 Can any of  the owners of a XV432 comment on the frequency stability? 
 
 Thanks.
 
 --Lenny
 
 
 

-- 
View this message in context: http://n2.nabble.com/XV432-tp4159735p4160089.html
Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] xv432

[ron]

am i thinking right that k10 grounds during xmit and is open on receive. i 
think it's stuck in xmit on mine.
ron 

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Re: [Elecraft] xv432

[Don Wilhelm]

Ron,

It certainly seems that way to me - those are Normally Open contacts and 
the relay coil is activated by 12T which is only active during transmit.

Disconnect everything from the Ant jack (J1) and measure the resistance 
between the center conductor of J1 to ground - it should be fairly high 
if all is well.

73,
Don W3FPR

ron wrote:
 am i thinking right that k10 grounds during xmit and is open on receive. i 
 think it's stuck in xmit on mine.
 ron 
   

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[Elecraft] XV432 alignment

[Ross]

Hi all,
I have put together an XV432 transverter and it went together very well.
But I have a problem on alignment, so can somebody assist please.

Aligning the local oscillator, the instructions are to peak L3,L4,L5 for 
maximum, for a peak voltage which should be between1.5 and 3volts,
nominally 2.5volts, however I can peak them ok, but the voltage is well over 
4volts and the L4 slug is almost out of the former.

Can anyone give me info as to what the problem could be.

Regards
Ross
ZL1WN
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[Elecraft] XV432 shuts down when K3 PTT is hit

[Parsons, Edward S (Ed)]

I have a recently assembled XV432 interfaced with my K3 and I am finding
that about 50% of the time I close the PTT on the K3, the XV432 turns
off.  Anybody have some insight on this problem?
Thanks.
 
73, Ed K1TR
 
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[Elecraft] xv432

[ron]

big thanks to robert friess for helping me get my rig working. simple fix 10 
ohm res in series with the power module input lead. stopped the rig from 
staying keyed at fullpower till i shut it off. now to make some 
contacts.thanks again, ron 


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Re: [Elecraft] xv432

[Johnny Siu]

Hello Ron,

While you are using your XV432, have you experienced any output power 
instability and frequency drift?

Initially, I find power instability in my XV144.  Upon advice from Gary of 
Elecraft, I do some works in improving the grounding of some of the sockets and 
joints.  The problem of power instability seems solved.

I am interested in knowing whether such instability also happened in XV432.  If 
you have time, please give your product review in eham.net

73

Johnny Siu VR2XMC
www.qrz.com/callsign/vr2xmc



--- 2008年11月25日 星期二，ron [EMAIL PROTECTED] 寫道﹕

 寄件人: ron [EMAIL PROTECTED]
 主題: [Elecraft] xv432
 收件人: elecraft@mailman.qth.net
 日期: 2008 11 25 星期二 下午 8:56
 big thanks to robert friess for helping me get my rig
 working. simple fix 10 ohm res in series with the power
 module input lead. stopped the rig from staying keyed at
 fullpower till i shut it off. now to make some
 contacts.thanks again, ron 
 ___



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[Elecraft] xv432

[ron]

still having problems with my xv432. voltage at tp-1 is 4.95 v, should be 
2.50 nom. any ideas. get this fixed an then i can go on to the big problem.
ron 


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Re: [Elecraft] xv432

[Johnny Siu]

Hi Ron,

Please keep the group informed of the latest development.  It is interested to 
notice that there is NOT even one single product review of XV432 in eham.net.

73

Johnny Siu VR2XMC


--- 2008年11月24日 星期一，ron [EMAIL PROTECTED] 寫道﹕

 寄件人: ron [EMAIL PROTECTED]
 主題: [Elecraft] xv432
 收件人: elecraft@mailman.qth.net
 日期: 2008 11 24 星期一 上午 12:03
 still having problems with my xv432. voltage at tp-1 is 4.95
 v, should be 2.50 nom. any ideas. get this fixed an then i
 can go on to the big problem.
 ron 
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Re: [Elecraft] xv432

[Robert Friess]

Hi Ron,

Have you applied the errata adding a cap and inductor to the RF module?

73,
Bob

2008/11/23 Johnny Siu [EMAIL PROTECTED]:
 Hi Ron,

 Please keep the group informed of the latest development.  It is interested 
 to notice that there is NOT even one single product review of XV432 in 
 eham.net.

 73

 Johnny Siu VR2XMC


 --- 2008年11月24日 星期一，ron [EMAIL PROTECTED] 寫道﹕

 寄件人: ron [EMAIL PROTECTED]
 主題: [Elecraft] xv432
 收件人: elecraft@mailman.qth.net
 日期: 2008 11 24 星期一 上午 12:03
 still having problems with my xv432. voltage at tp-1 is 4.95
 v, should be 2.50 nom. any ideas. get this fixed an then i
 can go on to the big problem.
 ron
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[Elecraft] xv432

[ron]

anybody work on xv432. need mine fixed. itbeyond my abilities.
ron
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[Elecraft] xv432

[ron]

it works on dummy load. on ant when you key it it goes to full power doesnt 
un key tiil you shut it off and the red led stays lit till you turn turn it 
back on. using k2 for radio.all other xv transverters work ok.where do i 
start looking. antenna works on a different radio.
ron 


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Re: [Elecraft] xv432

[Robert Friess]

Ron, did you apply the changes in the Assembly manual errata?

Bob, N6CM

On Tue, Oct 21, 2008 at 6:34 PM, ron [EMAIL PROTECTED] wrote:

 it works on dummy load. on ant when you key it it goes to full power doesnt 
 un key tiil you shut it off and the red led stays lit till you turn turn it 
 back on. using k2 for radio.all other xv transverters work ok.where do i 
 start looking. antenna works on a different radio.
 ron
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[Elecraft] XV432 Frequency and Power Stability

[Johnny Siu]

 Hi Stu,
 
 I am anxious to know the answer too.  Please keep the group
 informed about how you solve your problem. This could be the
 reason why I have been hesitating to order my XV432 for
 years.
 
 73
 
 Johnny Siu VR2XMC
 
 
 --- 2008年8月31日 星期日，Stu2 [EMAIL PROTECTED]
 寫道﹕
 
  寄件人: Stu2 [EMAIL PROTECTED]
  主題: [Elecraft] XV432 Frequency and Power Stability
  收件人: elecraft@mailman.qth.net
  日期: 2008 8 31 星期日 上午 3:54
  Hi All,
  
  I finished assembling a XV432 transverter and seem to
 have
  a little 
  problem with both power and frequency stability. After
  going through the 
  alignment steps, the power starts dropping from 20W
 down to
  about 10 
  after sending CW into a dummy load for 20 seconds or
 so.
  During this 
  time, the frequency drifts about 100 Hz. (Enough to
 detect
  a pitch 
  change in another receiver.)
  
  I installed Q1 using the Teflon spacer. I have the
 crystal
  oven 
  installed and the transverter was powered on for about
 30
  minutes or so 
  before I aligned it. (JP9 is on 4-5.) The part values
  appear to be 
  correct. The problem appears if I use a 5W source or a
 1
  milliwatt 
  source. (Changing JP3,4,5,6 accordingly.) My radio is
 a
  SDR-5000A.
  
  The power module doesn't get warm.
  
  I do NOT have the extra 5 turn coil and the 10pf
 capacitor
  installed on 
  the power module. (Rev C1 errata.)
  
  Has anybody else had this problem and if so, how did
 you
  fix it.
  
  Thanks!
  
  Stu
  W7IY
 
 
 
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 Mail，雅虎香港誠邀你參與意見調查。請前往http://surveylink.yahoo.com/wix/p5429076.aspx
 發表你的意見!


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[Elecraft] XV432 Frequency and Power Stability

[Stu2]

Hi All,

I finished assembling a XV432 transverter and seem to have a little 
problem with both power and frequency stability. After going through the 
alignment steps, the power starts dropping from 20W down to about 10 
after sending CW into a dummy load for 20 seconds or so. During this 
time, the frequency drifts about 100 Hz. (Enough to detect a pitch 
change in another receiver.)


I installed Q1 using the Teflon spacer. I have the crystal oven 
installed and the transverter was powered on for about 30 minutes or so 
before I aligned it. (JP9 is on 4-5.) The part values appear to be 
correct. The problem appears if I use a 5W source or a 1 milliwatt 
source. (Changing JP3,4,5,6 accordingly.) My radio is a SDR-5000A.


The power module doesn't get warm.

I do NOT have the extra 5 turn coil and the 10pf capacitor installed on 
the power module. (Rev C1 errata.)


Has anybody else had this problem and if so, how did you fix it.

Thanks!

Stu
W7IY
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[Elecraft] XV432 - users' comments

[Johnny Siu]

Hello Group.

In response to my earlier email asking for the above, I have received one reply 
so far.

Anyway, my second K3 has already been shipped so that it is now no point to 
place an order for xv432 in order to save shipping costs.

Thanks for your time in reading my post.

73

Johnny Siu VR2XMC


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[Elecraft] XV432 low output power

[Steve Bunting]

Hi Folks,

I wonder if I can pick the collective brain about my XV432 which has low 
power output.


I am driving the transverter with my K2 and the XV60. This is all fine 
as my XV144 performs perfectly. The problem is in my XV432.  Key down I 
get about 7W output for the first second or so then as they key is held 
down the output drops along a pseudo logarithmic curve. The K2 indicates 
that the drive power is falling (this does not happen with my XV144).


The typical voltages at active devices are OK (except for those which 
are cited for 20W output of course). The RX side seems OK, but I don't 
really have any serious test gear to run it against.


R22, the input attenuator is fully CW, i.e. least attenuation. This 
suggests that there is not enough drive, but the tx voltage at output 
pin of U6 is fine. Could I have I partially toasted the factory 
installed amplifier (U6 - I hope not). Perhaps the drop in output power 
could imply a filter problem?


I have checked all of the jumpers several times to see if is this an 
RTFM issue, but I am now stuck. Any suggestions?


73
Steve
M0BPQ
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[Elecraft] xv432

[Ron McMurray]

filter alignment, pg 28. when i try to adjust filters the voltage just keeps 
dropping.happens as soon as i key the rig. any sugestions. 
ron.
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RE: [Elecraft] xv432

[Siu Johnny]

Hi Ron,

After the XV144, I am also considering a XV432.  Please keep us updated or 
write your product review in the www.eham.net


73

Johnny Siu VR2XMC

From: Ron McMurray [EMAIL PROTECTED]
To: elecraft post elecraft@mailman.qth.net
Subject: [Elecraft] xv432
Date: Wed, 24 Jan 2007 18:29:58 -0600

filter alignment, pg 28. when i try to adjust filters the voltage just 
keeps dropping.happens as soon as i key the rig. any sugestions.

ron.

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[Elecraft] XV432 - product review in eham

[Siu Johnny]

Hi Group,

I have just created a product review column in www.eham.net for XV432.  I 
would be grateful if the XV432 users could give us their views.


http://www.eham.net/reviews/detail/6462

73

Johnny Siu VR2XMC

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[Elecraft] XV432, Q1...

[Gerhard Schwanz]

Hi List,

I soldered faster than I read. So Q1 is now installed in a common fashion 
without teflon spacer. Leads are clipped. What am I going to do now?


If the teflon is just for spacing I would remove the Q, prolong the leads 
and install it without the teflon but spaced (I think the teflon won't fit 
then). Will this work or does the teflon some other magic?


If the teflon does some other magic I think I have to order a new Q1...

Have a nice weekend

Gerhard 




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RE: [Elecraft] XV432, Q1...

[Ron D'Eau Claire]

I soldered faster than I read. So Q1 is now installed in a common fashion 
without teflon spacer. Leads are clipped. What am I going to do now?

If the teflon is just for spacing I would remove the Q, prolong the leads 
and install it without the teflon but spaced (I think the teflon won't fit 
then). Will this work or does the teflon some other magic?

If the teflon does some other magic I think I have to order a new Q1...

Have a nice weekend

Gerhard

-

Sorry to hear that Gerhard. I haven't tried it with the transistor installed
against the board but, as I understand it, the leads are required for
feedback for reliable operation. The Teflon spacer is a convenient way to
set the length correctly. It should work if you splice on longer leads as
long as they don't short out against each other. The other builders that
I've heard of doing that replaced the transistor. 

You are NOT the first to install Q1 without reading the step. Did you get
the Errata sheet that asked you to add this note ahead of that step?

NOTE: Read the following step completely and refer to Figure 23 before
installing Q1. Q1 is installed differently from other transistors in this
kit.

That should have started going out with the kits early this month (April) in
response to a couple of others who did the same thing.  

Is there anything else we could do differently to warn builders to read
before building? 

Ron AC7AC

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[Elecraft] XV432 on the air!

[John D'Ausilio]

Finally got around to building the XV432 this weekend .. pretty much
goes together just like the other XV's, took me about 6 hours. Fired
up just fine, got it tweaked and on the air last evening.

I'll be drilling the prototype combination end-panel this evening, and
if all goes well I'll post a pic of the 4-band stack installed in the
Jitney tomorrow sometime.

de w1rt/r john
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Re: [Elecraft] XV432 added to order page; New XV Data Sheet

[Simon Brown (HB9DRV)]

Slight follow-on, the IC-7800 has (from memory) full RX up to 50 MHz or so. 
I'm not looking at using terrestrial 70cms at the moment, but no doubt this 
will happen at some time (who knows).


With luck I'll have the IC-7000 in a few months, so for simplex 2m / 70cms 
this is the easier and (very essential) a portable option.


Simon Brown
---
http://blog.hb9drv.ch/

- Original Message - 
From: Simon Brown (HB9DRV) [EMAIL PROTECTED]



What's the receive range on 70cms? I am looking for satellite support 
using a transverter with my IC-7800.


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RE: [Elecraft] XV432 added to order page; New XV Data Sheet

[Don Wilhelm]

Simon,

Since the IF is stated to be 28 to 32 MHz, I believe that translates into a
receive range of 432 to 436 MHz.  I recall something being said earlier
about an optional crystal frequency for a different range, but I see nothing
about that in the XV data sheet.

73,
Don W3FPR

 -Original Message-

 What's the receive range on 70cms? I am looking for satellite
 support using
 a transverter with my IC-7800.

 Simon Brown
 ---
 http://blog.hb9drv.ch/

 - Original Message -
 From: Eric Swartz - WA6HHQ, Elecraft [EMAIL PROTECTED]
 
  There also is a new XV data sheet (.pdf) on our manual download
 page that
  includes the XV432 information. See:
  http://www.elecraft.com/manual/XV%20Data%20Sheet%202006%20web.pdf
 


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Re: [Elecraft] XV432 added to order page; New XV Data Sheet

[Simon Brown (HB9DRV)]

Hi,

I just printed out the XV flyer (on my new OKI C5250 colour printer). Didn't 
see this info about the IF - I wonder if my IC-7800 will TX between 30 and 
32 MHz in transverter mode - guess I'll have to ask around.


I usually just listen anyway, rarely transmit.

Simon Brown
---
http://blog.hb9drv.ch/

- Original Message - 
From: Don Wilhelm [EMAIL PROTECTED]


Since the IF is stated to be 28 to 32 MHz, I believe that translates into 
a

receive range of 432 to 436 MHz.  I recall something being said earlier
about an optional crystal frequency for a different range, but I see 
nothing

about that in the XV data sheet.


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