Re: [Elecraft] XV50 Rev B - Questions

[Don Wilhelm]

Brian,

In later XV transverters, JP9 controls when the crystal oven is powered.
Since you do not have JP9, even if you have a crystal oven, it will 
still work fine.
The oven will be powered when the XV50 is powered.  Just allow some time 
for it to warm up (about 20 minutes).
Actually, the 22MHz crystal does not drift much and usually does not 
require the oven.


73 and Happy Thanksgiving,
Don W3FPR

On 11/24/2021 12:20 PM, Brian Moore via Elecraft wrote:
Hello - I recently purchased an XV50 to use with my K2. While setting 
it up for a K2 with no K60XV per the manual, I noticed that there is 
no JP9, where I am supposed to short pins 1-2. On closer inspection, 
my XV50 has a rev B board and it appears these pins don't exist. The 
assembly manual I found online is for a Rev E board and owners manual 
is for Rev F1.


I'm assuming all the other jumper settings from the Rev E manual are 
correct for my Rev B XV50, but I thought I'd ask here for 
clarification before I damage my XV50, since it's almost irreplaceable 
now days. Also a Christmas wish would be to purchase a K60XV if anyone 
has one laying around that they'd be willing to sell.


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[Elecraft] XV50 Rev B - Questions

[Brian Moore via Elecraft]

Hello - I recently purchased an XV50 to use with my K2. While setting it 
up for a K2 with no K60XV per the manual, I noticed that there is no 
JP9, where I am supposed to short pins 1-2. On closer inspection, my 
XV50 has a rev B board and it appears these pins don't exist. The 
assembly manual I found online is for a Rev E board and owners manual is 
for Rev F1.


I'm assuming all the other jumper settings from the Rev E manual are 
correct for my Rev B XV50, but I thought I'd ask here for clarification 
before I damage my XV50, since it's almost irreplaceable now days. Also 
a Christmas wish would be to purchase a K60XV if anyone has one laying 
around that they'd be willing to sell.


Thanks, 73,

Brian - KM6ZX

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Re: [Elecraft] xv50

[Joseph McIntire]

If the specs I gave is the correct one that is. I think it is correct due to 
the part numbers are the same.  Just the 68-88 MHz through me off a little.

Joe AB3JN

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:57:34 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Rf parts still has a limited supply of them.

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:44:00 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Don I found  one online  same part  number  says 68-88 MHz, 30 watt, 12.5 V is 
that the correct one.

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:35:47 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Ok thanks for the info once again  don.

Joe AB3JN

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: Don Wilhelm 
Sent: Saturday, July 18, 2020 11:34:06 AM
To: Joseph McIntire ; Elecraft@mailman.qth.net 

Subject: Re: [Elecraft] xv50

Joe,

Great that you now have the XV144 now stable.

It would appear that the power module has gone "belly up".  I don't know
if Elecraft has any left (the XV50 was discontinued), but you can check.
  Also check at RF Parts to see if you can find one.
As I recall, that power module was discontinued.

73,
Don W3FPR

On 7/18/2020 9:50 AM, Joseph McIntire wrote:

>  The question I have is on the XV50 At first it did not work 
> I found Q5 to not be biasing. So I replaced it. This kit was partially put 
> together by my father in law who purchased it before he passed. Then about 
> ten years later I decided to finish it. But any how when I went to replace Q5 
> it looked like two of the legs may have been solder bridged and shorted. 
> Maybe it as not bad. But I was already unsoldering it and had a new one so I 
> just went ahead and replaced it. Then it would turn on after that. Then in 
> the alignment I was not getting voltage at TP5 with the radio keyed. Re 
> soldered some joint I found that looked suspect and once again cleaned all 
> the flux from the board. I had voltage at TP5 for a short time. Then it went 
> away upon investigating I realized I did not have that coax selected at the 
> coax switch to go to the dummy. So I guess I transmitted into an open ended 
> coax. Probably SWR way to high. And I probably burned up the power module. 
> Looking
  fr
>   om the front of the Xverter on the third lead toward the rear I have 13 
> VDC. On the second one back I get 4.4 VDC when keying. But never get any 
> worth while at the fourth one back. All I get there is about .011  when 
> keyed. So IT looks like the power module is getting power and is being keyed 
> but I am not getting anything out of it. Just hoping for someone to tell me 
> if this is correct and maybe if I can get this part from Elecraft or not.
>
>
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Re: [Elecraft] xv50

[Joseph McIntire]

Rf parts still has a limited supply of them.

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:44:00 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Don I found  one online  same part  number  says 68-88 MHz, 30 watt, 12.5 V is 
that the correct one.

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:35:47 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Ok thanks for the info once again  don.

Joe AB3JN

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: Don Wilhelm 
Sent: Saturday, July 18, 2020 11:34:06 AM
To: Joseph McIntire ; Elecraft@mailman.qth.net 

Subject: Re: [Elecraft] xv50

Joe,

Great that you now have the XV144 now stable.

It would appear that the power module has gone "belly up".  I don't know
if Elecraft has any left (the XV50 was discontinued), but you can check.
  Also check at RF Parts to see if you can find one.
As I recall, that power module was discontinued.

73,
Don W3FPR

On 7/18/2020 9:50 AM, Joseph McIntire wrote:

>  The question I have is on the XV50 At first it did not work 
> I found Q5 to not be biasing. So I replaced it. This kit was partially put 
> together by my father in law who purchased it before he passed. Then about 
> ten years later I decided to finish it. But any how when I went to replace Q5 
> it looked like two of the legs may have been solder bridged and shorted. 
> Maybe it as not bad. But I was already unsoldering it and had a new one so I 
> just went ahead and replaced it. Then it would turn on after that. Then in 
> the alignment I was not getting voltage at TP5 with the radio keyed. Re 
> soldered some joint I found that looked suspect and once again cleaned all 
> the flux from the board. I had voltage at TP5 for a short time. Then it went 
> away upon investigating I realized I did not have that coax selected at the 
> coax switch to go to the dummy. So I guess I transmitted into an open ended 
> coax. Probably SWR way to high. And I probably burned up the power module. 
> Looking
  fr
>   om the front of the Xverter on the third lead toward the rear I have 13 
> VDC. On the second one back I get 4.4 VDC when keying. But never get any 
> worth while at the fourth one back. All I get there is about .011  when 
> keyed. So IT looks like the power module is getting power and is being keyed 
> but I am not getting anything out of it. Just hoping for someone to tell me 
> if this is correct and maybe if I can get this part from Elecraft or not.
>
>
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Re: [Elecraft] xv50

[Joseph McIntire]

Don I found  one online  same part  number  says 68-88 MHz, 30 watt, 12.5 V is 
that the correct one.

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: elecraft-boun...@mailman.qth.net  on 
behalf of Joseph McIntire 
Sent: Saturday, July 18, 2020 11:35:47 AM
To: Elecraft@mailman.qth.net ; donw...@embarqmail.com 

Subject: Re: [Elecraft] xv50

Ok thanks for the info once again  don.

Joe AB3JN

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: Don Wilhelm 
Sent: Saturday, July 18, 2020 11:34:06 AM
To: Joseph McIntire ; Elecraft@mailman.qth.net 

Subject: Re: [Elecraft] xv50

Joe,

Great that you now have the XV144 now stable.

It would appear that the power module has gone "belly up".  I don't know
if Elecraft has any left (the XV50 was discontinued), but you can check.
  Also check at RF Parts to see if you can find one.
As I recall, that power module was discontinued.

73,
Don W3FPR

On 7/18/2020 9:50 AM, Joseph McIntire wrote:

>  The question I have is on the XV50 At first it did not work 
> I found Q5 to not be biasing. So I replaced it. This kit was partially put 
> together by my father in law who purchased it before he passed. Then about 
> ten years later I decided to finish it. But any how when I went to replace Q5 
> it looked like two of the legs may have been solder bridged and shorted. 
> Maybe it as not bad. But I was already unsoldering it and had a new one so I 
> just went ahead and replaced it. Then it would turn on after that. Then in 
> the alignment I was not getting voltage at TP5 with the radio keyed. Re 
> soldered some joint I found that looked suspect and once again cleaned all 
> the flux from the board. I had voltage at TP5 for a short time. Then it went 
> away upon investigating I realized I did not have that coax selected at the 
> coax switch to go to the dummy. So I guess I transmitted into an open ended 
> coax. Probably SWR way to high. And I probably burned up the power module. 
> Looking
  fr
>   om the front of the Xverter on the third lead toward the rear I have 13 
> VDC. On the second one back I get 4.4 VDC when keying. But never get any 
> worth while at the fourth one back. All I get there is about .011  when 
> keyed. So IT looks like the power module is getting power and is being keyed 
> but I am not getting anything out of it. Just hoping for someone to tell me 
> if this is correct and maybe if I can get this part from Elecraft or not.
>
>
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Re: [Elecraft] xv50

[Joseph McIntire]

Ok thanks for the info once again  don.

Joe AB3JN

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android<https://aka.ms/ghei36>


From: Don Wilhelm 
Sent: Saturday, July 18, 2020 11:34:06 AM
To: Joseph McIntire ; Elecraft@mailman.qth.net 

Subject: Re: [Elecraft] xv50

Joe,

Great that you now have the XV144 now stable.

It would appear that the power module has gone "belly up".  I don't know
if Elecraft has any left (the XV50 was discontinued), but you can check.
  Also check at RF Parts to see if you can find one.
As I recall, that power module was discontinued.

73,
Don W3FPR

On 7/18/2020 9:50 AM, Joseph McIntire wrote:

>  The question I have is on the XV50 At first it did not work 
> I found Q5 to not be biasing. So I replaced it. This kit was partially put 
> together by my father in law who purchased it before he passed. Then about 
> ten years later I decided to finish it. But any how when I went to replace Q5 
> it looked like two of the legs may have been solder bridged and shorted. 
> Maybe it as not bad. But I was already unsoldering it and had a new one so I 
> just went ahead and replaced it. Then it would turn on after that. Then in 
> the alignment I was not getting voltage at TP5 with the radio keyed. Re 
> soldered some joint I found that looked suspect and once again cleaned all 
> the flux from the board. I had voltage at TP5 for a short time. Then it went 
> away upon investigating I realized I did not have that coax selected at the 
> coax switch to go to the dummy. So I guess I transmitted into an open ended 
> coax. Probably SWR way to high. And I probably burned up the power module. 
> Looking
  fr
>   om the front of the Xverter on the third lead toward the rear I have 13 
> VDC. On the second one back I get 4.4 VDC when keying. But never get any 
> worth while at the fourth one back. All I get there is about .011  when 
> keyed. So IT looks like the power module is getting power and is being keyed 
> but I am not getting anything out of it. Just hoping for someone to tell me 
> if this is correct and maybe if I can get this part from Elecraft or not.
>
>
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Re: [Elecraft] xv50

[Don Wilhelm]

Joe,

Great that you now have the XV144 now stable.

It would appear that the power module has gone "belly up".  I don't know 
if Elecraft has any left (the XV50 was discontinued), but you can check. 
 Also check at RF Parts to see if you can find one.

As I recall, that power module was discontinued.

73,
Don W3FPR

On 7/18/2020 9:50 AM, Joseph McIntire wrote:


 The question I have is on the XV50 At first it did not work I 
found Q5 to not be biasing. So I replaced it. This kit was partially put 
together by my father in law who purchased it before he passed. Then about ten 
years later I decided to finish it. But any how when I went to replace Q5 it 
looked like two of the legs may have been solder bridged and shorted. Maybe it 
as not bad. But I was already unsoldering it and had a new one so I just went 
ahead and replaced it. Then it would turn on after that. Then in the alignment 
I was not getting voltage at TP5 with the radio keyed. Re soldered some joint I 
found that looked suspect and once again cleaned all the flux from the board. I 
had voltage at TP5 for a short time. Then it went away upon investigating I 
realized I did not have that coax selected at the coax switch to go to the 
dummy. So I guess I transmitted into an open ended coax. Probably SWR way to 
high. And I probably burned up the power module. Looking

 fr

  om the front of the Xverter on the third lead toward the rear I have 13 VDC. 
On the second one back I get 4.4 VDC when keying. But never get any worth while 
at the fourth one back. All I get there is about .011  when keyed. So IT looks 
like the power module is getting power and is being keyed but I am not getting 
anything out of it. Just hoping for someone to tell me if this is correct and 
maybe if I can get this part from Elecraft or not.



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[Elecraft] xv50

[Joseph McIntire]

Hello everyone. I just wanted to give an update and post a question. I spoke 
with don last week was working on a few xv transverters. After speaking with 
don I found the control cable from the K-3 was not fully seating in the plug 
due to screws on the plug were not in there proper place. Fixed that and 
everything started to work. But I was having some stability problems with the 
XV144 model transverter Don once again stated to check the attachment of the 
power module that it is grounded through the board where bolted to it. I also 
to some pics of the board. And for some reason when I looked at them I noticed 
all the flux I had not cleaned off the board. Never really noticed it much 
before even when looking at it through a large lighted magnifying glass. So I 
cleaned up the board. And the instructions have you putting a small washer 
between the board and the power module. So as he stated the is where the 
grounding is happening and a bad ground would affect the stability. I rep
 laced the washers with ones slightly larger to give a little more contact 
area. I believe it was Don that told me Elecraft sells or did sell A power 
module that the mounting area is thicker so there is no washers required there 
used as a spacer. But now everything is good. When I turn it on cold I will get 
about 22 watts out with 20 indicated. When I leave it on for a hour or so and 
everything is up to temp. I get about 20 watts out with 20 still indicated. So 
every thing seems to be good on the XV144 model.
The question I have is on the XV50 At first it did not work I 
found Q5 to not be biasing. So I replaced it. This kit was partially put 
together by my father in law who purchased it before he passed. Then about ten 
years later I decided to finish it. But any how when I went to replace Q5 it 
looked like two of the legs may have been solder bridged and shorted. Maybe it 
as not bad. But I was already unsoldering it and had a new one so I just went 
ahead and replaced it. Then it would turn on after that. Then in the alignment 
I was not getting voltage at TP5 with the radio keyed. Re soldered some joint I 
found that looked suspect and once again cleaned all the flux from the board. I 
had voltage at TP5 for a short time. Then it went away upon investigating I 
realized I did not have that coax selected at the coax switch to go to the 
dummy. So I guess I transmitted into an open ended coax. Probably SWR way to 
high. And I probably burned up the power module. Looking fr
 om the front of the Xverter on the third lead toward the rear I have 13 VDC. 
On the second one back I get 4.4 VDC when keying. But never get any worth while 
at the fourth one back. All I get there is about .011  when keyed. So IT looks 
like the power module is getting power and is being keyed but I am not getting 
anything out of it. Just hoping for someone to tell me if this is correct and 
maybe if I can get this part from Elecraft or not.

Joe AB3JN

Sent from Mail for Windows 10

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[Elecraft] XV50 FS

[Jim KO5V]

Good Morning,

I have listed my XV50 on QRZ.com. If you are interested, please check it out 
here:

https://forums.qrz.com/index.php?threads/elecraft-xv50-6m-transverter.680519/

Thanks for the bandwidth!

73, Jim KO5V
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Re: [Elecraft] XV50 question

[Jim KO5V]

I'm happy to say that my XV50 (formerly fried XV144) came to life and has 
passed all of its tests. I need to get a trustworthy frequency counter to 
really get it tweaked up, but it seems to make full power, and hear well. As 
usual, the only real problems I had were in properly configuring the K2. It's a 
lot smarter than I am, and didn't allow me to make any non-recoverable errors. 

Now, if 6M would just open up...

Happy Holidays to everyone!

73, Jim KO5V
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Re: [Elecraft] XV50 question

[Jim KO5V]

Thanks Don,

I'll test it as-is. The 2d connectors are all contacting clean metal, so it 
should be OK - at least in terms of noise.

73, Jim KO5V 


-Original Message-
>From: Don Wilhelm 
>Sent: Dec 23, 2018 12:09 PM
>To: Jim KO5V , Elecraft List 
>Subject: Re: [Elecraft] XV50 question
>
>Jim,
>
>I would have to ask the XV series designer, but he specified that those 
>transistors be mounted above the board.  Likely for LO stability, and 
>better separation from the ground plane on the board.
>
>I believe it should work mounted the same way in the XV50.  If you find 
>LO instability, then mount it down on the board.
>
>If you scraped the paint from all panels where they contact the 2D 
>connectors and the output jack, there should be little noise conducted 
>to the inside of the transverter.
>
>73,
>Don W3FPR
>
>On 12/23/2018 1:30 PM, Jim KO5V wrote:
>> First, Happy Holidays to everyone, and thanks for all of the helpful advice 
>> over the past few months.
>> 
>> 
>> Here's my question: in the XV144 and XV222 sections of the assembly manual, 
>> Q1 is installed with long leads, standing above the board. The XV50 
>> instructions do not mention this. Should I re-install it in the usual way 
>> (close to the board), or leave it. Also, can anyone tell me the reason for 
>> elevating it in the other XVs? That seems like a good way to pick up noise 
>> to me, but a lot of you have forgotten more than I know about this stuff...
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Re: [Elecraft] XV50 question

[Don Wilhelm]

Jim,

I would have to ask the XV series designer, but he specified that those 
transistors be mounted above the board.  Likely for LO stability, and 
better separation from the ground plane on the board.


I believe it should work mounted the same way in the XV50.  If you find 
LO instability, then mount it down on the board.


If you scraped the paint from all panels where they contact the 2D 
connectors and the output jack, there should be little noise conducted 
to the inside of the transverter.


73,
Don W3FPR

On 12/23/2018 1:30 PM, Jim KO5V wrote:

First, Happy Holidays to everyone, and thanks for all of the helpful advice 
over the past few months.


Here's my question: in the XV144 and XV222 sections of the assembly manual, Q1 
is installed with long leads, standing above the board. The XV50 instructions 
do not mention this. Should I re-install it in the usual way (close to the 
board), or leave it. Also, can anyone tell me the reason for elevating it in 
the other XVs? That seems like a good way to pick up noise to me, but a lot of 
you have forgotten more than I know about this stuff...

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[Elecraft] XV50 question

[Jim KO5V]

First, Happy Holidays to everyone, and thanks for all of the helpful advice 
over the past few months.

I purchased a badly-built and fried XV144 several years ago (I got it really 
cheap). The builder had shorted leads 1 & 2 of T1 above the PC board, and 
during initial testing, I think that caused a burned a trace on the board. The 
adjustable cores of L15, L16 and L17 were driven to the bottom of the 
inductors, and were broken from contacting the board.

I removed all of the XV144-specific parts including the SMT stuff, and replaced 
them with the correct XV50 parts. I repaired the trace and re-wound T1, and 
checked that each component was correct and properly installed. I also tested 
all of the active devices. I then re-soldered every joint. It looks pretty good 
now, but I hope the processor isn't also ruined from the smoke test.

Here's my question: in the XV144 and XV222 sections of the assembly manual, Q1 
is installed with long leads, standing above the board. The XV50 instructions 
do not mention this. Should I re-install it in the usual way (close to the 
board), or leave it. Also, can anyone tell me the reason for elevating it in 
the other XVs? That seems like a good way to pick up noise to me, but a lot of 
you have forgotten more than I know about this stuff...

Thanks in advance. 73

Jim KO5V
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Re: [Elecraft] XV50 no output

[Dave Sergeant]

And it turned out to be the cable from the K2 to the transverter. The 
pin of the BNC plug at the XV50 end had pushed back so not making. 
Together with the BNC/phone adaptor at the K2 end which is not the best 
arrangement. I obviously need to make up a couple of proper phono-BNC 
cables.

I assume the BNC sockets on the XV50 are 50 ohm variants. I know the 
pin diameters of 50 and 75 ohm are supposed to be compatible but maybe 
that on the off the shelf BNC lead I used, presumably 75 ohm, has 
thicker pins which caused the issue.

73 Dave G3YMC

On 21 Nov 2015 at 10:45, Dave Sergeant wrote:

> Thanks Don. Having looked at it again it does actually look as if the
> output from the K2 transverter socket is missing or very low. I got a
> bit confused about levels (as well as making typos) and I should most
> definitely be able to see the 1mW on my scope (632mV p-p). I did have to
> tighten up the locknuts on the phono sockets at the K2, maybe there is
> an open circuit or short circuit there as well. Will take the K2 apart
> again later and check, but the XV50 is probably OK.
> 
> 73 Dave G3YMC
> 
> On 20 Nov 2015 at 14:28, Don Wilhelm wrote:
> 
> > Dave,
> > 
> > Be cautious with conclusions when probing with a 'scope probe in the
> > 50 MHz section of the XV50.  The probe can pick up RF and produce
> > false output indications. The fact that you can induce output by
> > probing C48 does normally indicate that U6 and U7 are capable of
> > producing a signal. Check the LO signal.  If that is good, then the
> > problem may be in the 28 MHz bandpass or the mixer.
> > 
> > I am puzzled by your reference to 5mW.  The K2 with the K60XV has 1mW
> > output - was that a typo?
> > 
> > If you want to probe the 28 MHz IF in the XV50, you can re-plug the
> > transverter for up to 5 watts input and you should be able to follow
> > the signal path through the 28 MHz bandpass filter - all the way to
> > the mixer input.
> > 
> > If it works with the high level input, then try the low level input
> > again - the 1mW input removes the attenuator and adds the gain of the
> > Q6 stage.
> > 
> > 73.
> > Don W3FPR
> > 
> > On 11/20/2015 11:22 AM, Dave Sergeant wrote:
> > > My XV50, which worked fine for this summer's sporadic E season, has
> > > suddenly gone faulty and has no output in either CW or SSB. The
> > > input from the K2 is present, although of course 5mW is pretty hard
> > > to measure accurately with my scope. There is also no signal at the
> > > input of the power amplifier module, but if I connect my scope probe
> > > to C48, at the output of the bandpass filter, and key the rig I have
> > > more or less correct output and a good 50MHz sinewave on the scope -
> > > as soon as I remove the probe the output disappears again. So the
> > > output module is fine and the fault would seem to be related to the
> > > U6 buffer or the bandpass filter. I am a bit mystified and need to
> > > sit down and work out what is really happening.
> > >
> > >

http://davesergeant.com

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Re: [Elecraft] XV50 no output

[Dave Olean]

I think I win the prize for not checking the obvious. I turned on my 
homebrew 160 meter 3-1000Z amp and saw only 400 watts instead of the normal 
1300 watts out. I ended up taking the amp apart, and measuring all the RF 
components. I tested the cables.  I had the PI network coils out. I removed 
the blocking caps. I ripped into the cathode input circuit...everything that 
could possibly cause a problem. I found nothing that looked wrong or bad. 
Then I discovered that my Bird 43 meter circuit was bad. It made for a good 
laugh at my expense. I rationalized it all knowing that the amp had been 
checked out really well.


Dave K1WHS
- Original Message - 
From: "Guy Olinger K2AV" <k2av@gmail.com>

To: "Dave Sergeant" <d...@davesergeant.com>
Cc: <elecraft@mailman.qth.net>
Sent: Saturday, November 21, 2015 4:02 PM
Subject: Re: [Elecraft] XV50 no output



Hi Dave, and to the masses of readers we can hear breathing in the
background...

I've surely done that myself, once with the equipment out and ready to 
ship

before logic gained the upper hand and I started checking cords and
connectors, finally detecting a male BNC on a cord with a retracted center
pin.  Sound familiar?  :>)

So many of us have had experiences like this. Cord goes bad and to start
off we spend time trying to figure what's the matter with the box, the K3,
the transverter, etc.

One local ham went nearly nuts thinking his box had been supplied with
non-standard type F female chassis connectors until a friend discovered
that the male F connector in question had not been threaded in the
manufacturing process ! That story was source of a lot of local ham 
laughs.


Carefully checking the cords and connectors *first* seems to be
counter-intuitive. While logic says that connectors and wire in the cords
take all the mechanical abuse, our gut lurch is elsewhere. Maybe it's
because making cords is such a royal pain in the *ss and our subconscious
is rebelling against making another jumper.

I share your pain. Maybe half the time I take advantage of experience and
go after the cords first off. My personal gut lurch is still, "What the
&&$#@$$ is wrong with the  now !!!"

73, Guy K2AV

On Saturday, November 21, 2015, Dave Sergeant <d...@davesergeant.com> 
wrote:



And it turned out to be the cable from the K2 to the transverter. The
pin of the BNC plug at the XV50 end had pushed back so not making.
Together with the BNC/phone adaptor at the K2 end which is not the best
arrangement. I obviously need to make up a couple of proper phono-BNC
cables.

I assume the BNC sockets on the XV50 are 50 ohm variants. I know the
pin diameters of 50 and 75 ohm are supposed to be compatible but maybe
that on the off the shelf BNC lead I used, presumably 75 ohm, has
thicker pins which caused the issue.

73 Dave G3YMC


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Re: [Elecraft] XV50 no output

[Guy Olinger K2AV]

Hi Dave, and to the masses of readers we can hear breathing in the
background...

I've surely done that myself, once with the equipment out and ready to ship
before logic gained the upper hand and I started checking cords and
connectors, finally detecting a male BNC on a cord with a retracted center
pin.  Sound familiar?  :>)

So many of us have had experiences like this. Cord goes bad and to start
off we spend time trying to figure what's the matter with the box, the K3,
the transverter, etc.

One local ham went nearly nuts thinking his box had been supplied with
non-standard type F female chassis connectors until a friend discovered
that the male F connector in question had not been threaded in the
manufacturing process ! That story was source of a lot of local ham laughs.

Carefully checking the cords and connectors *first* seems to be
counter-intuitive. While logic says that connectors and wire in the cords
take all the mechanical abuse, our gut lurch is elsewhere. Maybe it's
because making cords is such a royal pain in the *ss and our subconscious
is rebelling against making another jumper.

I share your pain. Maybe half the time I take advantage of experience and
go after the cords first off. My personal gut lurch is still, "What the
&&$#@$$ is wrong with the  now !!!"

73, Guy K2AV

On Saturday, November 21, 2015, Dave Sergeant  wrote:

> And it turned out to be the cable from the K2 to the transverter. The
> pin of the BNC plug at the XV50 end had pushed back so not making.
> Together with the BNC/phone adaptor at the K2 end which is not the best
> arrangement. I obviously need to make up a couple of proper phono-BNC
> cables.
>
> I assume the BNC sockets on the XV50 are 50 ohm variants. I know the
> pin diameters of 50 and 75 ohm are supposed to be compatible but maybe
> that on the off the shelf BNC lead I used, presumably 75 ohm, has
> thicker pins which caused the issue.
>
> 73 Dave G3YMC
>
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Re: [Elecraft] XV50 no output

[Dave Sergeant]

Danny

Decent BNC connectors have identical pin diameters in both 75 and 50 
ohms versions and are fully compatible (unlike N type which are 
definitely incompatible). But obviously these cheaper ready made up 
cables use cheap plugs so may well have fat pins.

As an interim measure I have taken a couple more of the cheap BNC/BNC 
leads and chopped one of the plugs off and fitted a phono plug, which 
at least gets round the problems of adaptors - still 75 ohms of course. 
A quick search shows that all made up BNC-phono leads are 75 ohms so to 
go to 50 ohm leads you really do need to make it up yourself - and I 
don't seem to have any BNC plugs in the spares box at the moment.

This has got it up and running again, but I have revealed another issue 
- the earthing of the phono sockets in the K60XV at the K2 end is not 
ideal. Only the output phono has a grounding lug, the input phono 
relies on earthing via the aluminium panel. Although there are crinkle 
washers both sides of the socket the socket tends to wear loose every 
time you put the plug in. The receive noise on the XV50 shows this, as 
you wriggle the cable at that end the noise goes up and down. It really 
needs a direct earth to the ground on the K60XV panel.

I guess now having got it going not much else will happen until the 
sporadic E season starts next May...

73 Dave G3YMC

On 21 Nov 2015 at 19:44, Danny Higgins wrote:

> I remember buying some cheap BNC patch leads at a rally which worked
> fine. After a swap around my RX went deaf and I couldn't work out what
> was wrong. After a lot of diagnosis I started to inject a large signal
> and worked all the way back to the BNC antenna input socket, where I
> found that the cheap leads were 75 Ohm video types with fat centre pins
> that had splayed out the centre of the socket so that while they worked,
> there was no connection to the centre pin of a thinner 50 Ohm plug. 
> They went straight in the bin after that.
> 
> Danny, G3XVR
> 


http://davesergeant.com

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Re: [Elecraft] XV50 no output

[Don Wilhelm]

Dave,
Properly tightened against the internal tooth lockwashers, those RCA 
jacks should not loosen.
Unless someone used substitutes, they have a hex nut on each side of the 
panel and an internal tooth lockwasher on each side of the panel too.
Use wrenches (spanners for you) or pliers and tighten them securely.  
The internal tooth lockwashers need to 'bite' securely into the aluminum.


73,
Don W3FPR

On 11/21/2015 3:03 PM, Dave Sergeant wrote:

This has got it up and running again, but I have revealed another issue
- the earthing of the phono sockets in the K60XV at the K2 end is not
ideal. Only the output phono has a grounding lug, the input phono
relies on earthing via the aluminium panel. Although there are crinkle
washers both sides of the socket the socket tends to wear loose every
time you put the plug in. The receive noise on the XV50 shows this, as
you wriggle the cable at that end the noise goes up and down. It really
needs a direct earth to the ground on the K60XV panel.




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Re: [Elecraft] XV50 no output

[Danny Higgins]

I remember buying some cheap BNC patch leads at a rally which worked fine.
After a swap around my RX went deaf and I couldn't work out what was wrong.
After a lot of diagnosis I started to inject a large signal and worked all
the way back to the BNC antenna input socket, where I found that the cheap
leads were 75 Ohm video types with fat centre pins that had splayed out the
centre of the socket so that while they worked, there was no connection to
the centre pin of a thinner 50 Ohm plug.  They went straight in the bin
after that.

Danny, G3XVR

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy
Olinger K2AV
Sent: 21 November 2015 16:03
To: Dave Sergeant
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] XV50 no output

Hi Dave, and to the masses of readers we can hear breathing in the
background...

I've surely done that myself, once with the equipment out and ready to ship
before logic gained the upper hand and I started checking cords and
connectors, finally detecting a male BNC on a cord with a retracted center
pin.  Sound familiar?  :>)

So many of us have had experiences like this. Cord goes bad and to start off
we spend time trying to figure what's the matter with the box, the K3, the
transverter, etc.

One local ham went nearly nuts thinking his box had been supplied with
non-standard type F female chassis connectors until a friend discovered that
the male F connector in question had not been threaded in the manufacturing
process ! That story was source of a lot of local ham laughs.

Carefully checking the cords and connectors *first* seems to be
counter-intuitive. While logic says that connectors and wire in the cords
take all the mechanical abuse, our gut lurch is elsewhere. Maybe it's
because making cords is such a royal pain in the *ss and our subconscious is
rebelling against making another jumper.

I share your pain. Maybe half the time I take advantage of experience and go
after the cords first off. My personal gut lurch is still, "What the &&$#@$$
is wrong with the  now !!!"

73, Guy K2AV

On Saturday, November 21, 2015, Dave Sergeant <d...@davesergeant.com> wrote:

> And it turned out to be the cable from the K2 to the transverter. The 
> pin of the BNC plug at the XV50 end had pushed back so not making.
> Together with the BNC/phone adaptor at the K2 end which is not the 
> best arrangement. I obviously need to make up a couple of proper 
> phono-BNC cables.
>
> I assume the BNC sockets on the XV50 are 50 ohm variants. I know the 
> pin diameters of 50 and 75 ohm are supposed to be compatible but maybe 
> that on the off the shelf BNC lead I used, presumably 75 ohm, has 
> thicker pins which caused the issue.
>
> 73 Dave G3YMC
>
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Re: [Elecraft] XV50 no output

[Don Wilhelm]

You must have had some older 75 ohm BNC connectors.
Those which comply with the 1978 standard IEC 169-8 will interchange 
non-destructively - so says Wikipedia


73,
Don W3FPR

On 11/21/2015 2:44 PM, Danny Higgins wrote:

I remember buying some cheap BNC patch leads at a rally which worked fine.
After a swap around my RX went deaf and I couldn't work out what was wrong.
After a lot of diagnosis I started to inject a large signal and worked all
the way back to the BNC antenna input socket, where I found that the cheap
leads were 75 Ohm video types with fat centre pins that had splayed out the
centre of the socket so that while they worked, there was no connection to
the centre pin of a thinner 50 Ohm plug.  They went straight in the bin
after that.




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Re: [Elecraft] XV50 no output

[Dave Sergeant]

Thanks Don. Having looked at it again it does actually look as if the 
output from the K2 transverter socket is missing or very low. I got a 
bit confused about levels (as well as making typos) and I should most 
definitely be able to see the 1mW on my scope (632mV p-p). I did have 
to tighten up the locknuts on the phono sockets at the K2, maybe there 
is an open circuit or short circuit there as well. Will take the K2 
apart again later and check, but the XV50 is probably OK.

73 Dave G3YMC

On 20 Nov 2015 at 14:28, Don Wilhelm wrote:

> Dave,
> 
> Be cautious with conclusions when probing with a 'scope probe in the 50
> MHz section of the XV50.  The probe can pick up RF and produce false
> output indications. The fact that you can induce output by probing C48
> does normally indicate that U6 and U7 are capable of producing a signal.
> Check the LO signal.  If that is good, then the problem may be in the 28
> MHz bandpass or the mixer.
> 
> I am puzzled by your reference to 5mW.  The K2 with the K60XV has 1mW
> output - was that a typo?
> 
> If you want to probe the 28 MHz IF in the XV50, you can re-plug the
> transverter for up to 5 watts input and you should be able to follow the
> signal path through the 28 MHz bandpass filter - all the way to the
> mixer input.
> 
> If it works with the high level input, then try the low level input
> again - the 1mW input removes the attenuator and adds the gain of the Q6
> stage.
> 
> 73.
> Don W3FPR
> 
> On 11/20/2015 11:22 AM, Dave Sergeant wrote:
> > My XV50, which worked fine for this summer's sporadic E season, has
> > suddenly gone faulty and has no output in either CW or SSB. The input
> > from the K2 is present, although of course 5mW is pretty hard to
> > measure accurately with my scope. There is also no signal at the input
> > of the power amplifier module, but if I connect my scope probe to C48,
> > at the output of the bandpass filter, and key the rig I have more or
> > less correct output and a good 50MHz sinewave on the scope - as soon
> > as I remove the probe the output disappears again. So the output
> > module is fine and the fault would seem to be related to the U6 buffer
> > or the bandpass filter. I am a bit mystified and need to sit down and
> > work out what is really happening.
> >
> >
> 


http://davesergeant.com

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[Elecraft] XV50 no output

[Dave Sergeant]

My XV50, which worked fine for this summer's sporadic E season, has 
suddenly gone faulty and has no output in either CW or SSB. The input 
from the K2 is present, although of course 5mW is pretty hard to 
measure accurately with my scope. There is also no signal at the input 
of the power amplifier module, but if I connect my scope probe to C48, 
at the output of the bandpass filter, and key the rig I have more or 
less correct output and a good 50MHz sinewave on the scope - as soon as 
I remove the probe the output disappears again. So the output module is 
fine and the fault would seem to be related to the U6 buffer or the 
bandpass filter. I am a bit mystified and need to sit down and work out 
what is really happening.

Is there anywhere I should be looking?

73 Dave G3YMC

http://davesergeant.com

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Re: [Elecraft] XV50 no output

[Don Wilhelm]

Dave,

Be cautious with conclusions when probing with a 'scope probe in the 50 
MHz section of the XV50.  The probe can pick up RF and produce false 
output indications.
The fact that you can induce output by probing C48 does normally 
indicate that U6 and U7 are capable of producing a signal.
Check the LO signal.  If that is good, then the problem may be in the 28 
MHz bandpass or the mixer.


I am puzzled by your reference to 5mW.  The K2 with the K60XV has 1mW 
output - was that a typo?


If you want to probe the 28 MHz IF in the XV50, you can re-plug the 
transverter for up to 5 watts input and you should be able to follow the 
signal path through the 28 MHz bandpass filter - all the way to the 
mixer input.


If it works with the high level input, then try the low level input 
again - the 1mW input removes the attenuator and adds the gain of the Q6 
stage.


73.
Don W3FPR

On 11/20/2015 11:22 AM, Dave Sergeant wrote:

My XV50, which worked fine for this summer's sporadic E season, has
suddenly gone faulty and has no output in either CW or SSB. The input
from the K2 is present, although of course 5mW is pretty hard to
measure accurately with my scope. There is also no signal at the input
of the power amplifier module, but if I connect my scope probe to C48,
at the output of the bandpass filter, and key the rig I have more or
less correct output and a good 50MHz sinewave on the scope - as soon as
I remove the probe the output disappears again. So the output module is
fine and the fault would seem to be related to the U6 buffer or the
bandpass filter. I am a bit mystified and need to sit down and work out
what is really happening.




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[Elecraft] XV50 transverter for sale

[Jerry Ford]

 Good Afternoon All:
I have for sale an XV50  6  meter transverter.    I built this transverterto go 
with my K2. Unfortunately,  I haven't had much time to play on theradio so 
I'm moving some of my stuff out.
This transverter is as new.   Not a mark on it anywhere ! It works 
flawlessly.   
SO,  if your considering some spring E skip on 6,   here's a good way toget 
involved.  I'm asking $250.00  shipped.   I will double box to protect it.   
Comes with the manual which is also new.  
Please contact me off the list.  
thanks and 73:    Jerry N0JRN

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Re: [Elecraft] XV50 PA Bias

[Dave Sergeant]

An update on my XV50.

Having failed to get the pa bias greater than around 500mA I decided to 
press ahead with the rest of the alignment. It is now basically working 
but only at the 5-10W level. If I increase the drive to 20W it 
effectively limits at that level, no more than 20W can be obtained and 
it is VERY flat topped on SSB. I assume this is because the pa is 
non-linear because of the incorrect bias. But it appears reasonably 
linear with the input attenuation R22 turned down to the lower power.

I also did the mod to my KAT2, changing the 47 ohm to 470 ohm - the 
power control on the K2 now works correctly.

I intend to leave it set at the 5-10W level and get some reports from 
locals - that is the sort of power I intend to use anyway.

I see there have been various similar postings on the reflector over 
the past few years with no real answers forthcoming. Looking at the 
datasheet of the RA30H0608M it is only specified down to 60MHz and the 
performance at 50MHz is totally unspecified. I suspect I, and others 
who have had these sort of issues, have devices at the edge of the spec 
and the only cure is to try a replacement, which really is pot luck.

73 Dave G3YMC

On 24 Oct 2014 at 13:49, Dave Sergeant wrote:

 R39 is correct (10k pot) as is R10 (100k) and all the measurements
 confirm this. The adjustment range, measured at pin 2 of the amplifier
 module, is 2.5-4.7V, also what is expected from the circuit. The maximum
 voltage is limited to 4.7V because of the 5mA flowing through R28 which
 swamps the 1mA bias current.
 
 What I would like to know is what the bias voltage should be on a 
 correctly set up XV50. The datasheet seems to indicate it must be at
 least greater than 4.5V. It seems my amp needs more than 4.7V to get the
 correct bias, and judging from previous posts on this subject I don't
 think I am alone.
 
 73 Dave G3YMC
 
 On 24 Oct 2014 at 7:46, Don Wilhelm wrote:
 
  Dave,
  
  The PA bias control usually has much greater range than is needed, and
  the PA bias input should draw very little current. Check the
  resistance of R39.  Is there a chance that you swapped R39 and R10
  during the assembly?
  
  73,
  Don W3FPR
  
  On 10/24/2014 6:46 AM, Dave Sergeant wrote:
   I am aligning my new XV50, latest build using the RA30H0608M module
   and having issues with setting the quiescent bias of the pa as per
   the manual. I see others have had this same problem but I can find
   no answers.
  
   The manaul calls for R39 to be adjusted for 20mV on the DMM across
   TP3/4 (across the 20mohm current sense resistor R17). With R39 at
   its maximum I get 16mV corresponding to a total current of 800mA as
   against the required 1A. This is confirmed by the digital current
   meter on the 12V psu powering it and my K2, which increases from
   0.5A to 1.3A when I enable transmit on the XV50.
  
   Before anybody asks, I DO have link W1 fitted, and in fact I have
   the correct bias voltage on pin 2 of the output module. However
   there is where I suspect the problem as the maximum voltage
   achievable there is 4.7V.
  
   I found a datasheet of the RA30H0608M, albeit a preliminary one
   which has a few sheets 'in preparation'. It does not give any
   figures for standing bias versus the bias volts but suggests it must
   be somewhere between 4.5 and 5V (there is no power output below
   4.5V). The voltage at the R29/R39 junction is limited by the current
   flowing through R28 and the module bias current (typically 1mA). So
   I am wondering whether some rf modules need a bit more than 4.7V to
   get the correct bias current of around 1A. Maybe reducing the value
   of R39 (56 ohms) is the answer. Or is mine near enough for good
   linearity?

http://davesergeant.com

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[Elecraft] XV50 PA Bias

[Dave Sergeant]

I am aligning my new XV50, latest build using the RA30H0608M module and 
having issues with setting the quiescent bias of the pa as per the 
manual. I see others have had this same problem but I can find no 
answers.

The manaul calls for R39 to be adjusted for 20mV on the DMM across 
TP3/4 (across the 20mohm current sense resistor R17). With R39 at its 
maximum I get 16mV corresponding to a total current of 800mA as against 
the required 1A. This is confirmed by the digital current meter on the 
12V psu powering it and my K2, which increases from 0.5A to 1.3A when I 
enable transmit on the XV50.

Before anybody asks, I DO have link W1 fitted, and in fact I have the 
correct bias voltage on pin 2 of the output module. However there is 
where I suspect the problem as the maximum voltage achievable there is 
4.7V.

I found a datasheet of the RA30H0608M, albeit a preliminary one which 
has a few sheets 'in preparation'. It does not give any figures for 
standing bias versus the bias volts but suggests it must be somewhere 
between 4.5 and 5V (there is no power output below 4.5V). The voltage 
at the R29/R39 junction is limited by the current flowing through R28 
and the module bias current (typically 1mA). So I am wondering whether 
some rf modules need a bit more than 4.7V to get the correct bias 
current of around 1A. Maybe reducing the value of R39 (56 ohms) is the 
answer. Or is mine near enough for good linearity?

Any help welcome.

73 Dave G3YMC

http://davesergeant.com

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Re: [Elecraft] XV50 PA Bias

[Don Wilhelm]

Dave,

The PA bias control usually has much greater range than is needed, and 
the PA bias input should draw very little current.
Check the resistance of R39.  Is there a chance that you swapped R39 and 
R10 during the assembly?


73,
Don W3FPR

On 10/24/2014 6:46 AM, Dave Sergeant wrote:

I am aligning my new XV50, latest build using the RA30H0608M module and
having issues with setting the quiescent bias of the pa as per the
manual. I see others have had this same problem but I can find no
answers.

The manaul calls for R39 to be adjusted for 20mV on the DMM across
TP3/4 (across the 20mohm current sense resistor R17). With R39 at its
maximum I get 16mV corresponding to a total current of 800mA as against
the required 1A. This is confirmed by the digital current meter on the
12V psu powering it and my K2, which increases from 0.5A to 1.3A when I
enable transmit on the XV50.

Before anybody asks, I DO have link W1 fitted, and in fact I have the
correct bias voltage on pin 2 of the output module. However there is
where I suspect the problem as the maximum voltage achievable there is
4.7V.

I found a datasheet of the RA30H0608M, albeit a preliminary one which
has a few sheets 'in preparation'. It does not give any figures for
standing bias versus the bias volts but suggests it must be somewhere
between 4.5 and 5V (there is no power output below 4.5V). The voltage
at the R29/R39 junction is limited by the current flowing through R28
and the module bias current (typically 1mA). So I am wondering whether
some rf modules need a bit more than 4.7V to get the correct bias
current of around 1A. Maybe reducing the value of R39 (56 ohms) is the
answer. Or is mine near enough for good linearity?




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Re: [Elecraft] XV50 PA Bias

[Dave Sergeant]

R39 is correct (10k pot) as is R10 (100k) and all the measurements 
confirm this. The adjustment range, measured at pin 2 of the amplifier 
module, is 2.5-4.7V, also what is expected from the circuit. The 
maximum voltage is limited to 4.7V because of the 5mA flowing through 
R28 which swamps the 1mA bias current.

What I would like to know is what the bias voltage should be on a 
correctly set up XV50. The datasheet seems to indicate it must be at 
least greater than 4.5V. It seems my amp needs more than 4.7V to get 
the correct bias, and judging from previous posts on this subject I 
don't think I am alone.

73 Dave G3YMC

On 24 Oct 2014 at 7:46, Don Wilhelm wrote:

 Dave,
 
 The PA bias control usually has much greater range than is needed, and
 the PA bias input should draw very little current. Check the resistance
 of R39.  Is there a chance that you swapped R39 and R10 during the
 assembly?
 
 73,
 Don W3FPR
 
 On 10/24/2014 6:46 AM, Dave Sergeant wrote:
  I am aligning my new XV50, latest build using the RA30H0608M module
  and having issues with setting the quiescent bias of the pa as per the
  manual. I see others have had this same problem but I can find no
  answers.
 
  The manaul calls for R39 to be adjusted for 20mV on the DMM across
  TP3/4 (across the 20mohm current sense resistor R17). With R39 at its
  maximum I get 16mV corresponding to a total current of 800mA as
  against the required 1A. This is confirmed by the digital current
  meter on the 12V psu powering it and my K2, which increases from 0.5A
  to 1.3A when I enable transmit on the XV50.
 
  Before anybody asks, I DO have link W1 fitted, and in fact I have the
  correct bias voltage on pin 2 of the output module. However there is
  where I suspect the problem as the maximum voltage achievable there is
  4.7V.
 
  I found a datasheet of the RA30H0608M, albeit a preliminary one which
  has a few sheets 'in preparation'. It does not give any figures for
  standing bias versus the bias volts but suggests it must be somewhere
  between 4.5 and 5V (there is no power output below 4.5V). The voltage
  at the R29/R39 junction is limited by the current flowing through R28
  and the module bias current (typically 1mA). So I am wondering whether
  some rf modules need a bit more than 4.7V to get the correct bias
  current of around 1A. Maybe reducing the value of R39 (56 ohms) is the
  answer. Or is mine near enough for good linearity?
 
 
 


http://davesergeant.com

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Re: [Elecraft] XV50 PA Bias

[Don Wilhelm]

Dave,

R39 for the XV50 should be a 1k pot.  Typo or incorrect component?
The bias voltage is not the important factor, important is the ability 
to produce the proper idling current - that is why the instructions tell 
you to measure the voltage between TP3 and TP4 when setting the bias.
The voltage at the bias pin will typically be in the 4.7 volt range, but 
there is no problem if it is higher or lower.


73,
Don W3FPR

On 10/24/2014 8:49 AM, Dave Sergeant wrote:

R39 is correct (10k pot) as is R10 (100k) and all the measurements
confirm this. The adjustment range, measured at pin 2 of the amplifier
module, is 2.5-4.7V, also what is expected from the circuit. The
maximum voltage is limited to 4.7V because of the 5mA flowing through
R28 which swamps the 1mA bias current.

What I would like to know is what the bias voltage should be on a
correctly set up XV50. The datasheet seems to indicate it must be at
least greater than 4.5V. It seems my amp needs more than 4.7V to get
the correct bias, and judging from previous posts on this subject I
don't think I am alone.




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[Elecraft] XV50 for trade

[Mike Sanders]

I have a clean working XV50 no problems that I would like to trade for an
XV432.
Anyone interested? 73, Mike K0AZ   k...@centurytel.net

 

 
'IN GOD WE TRUST'

 
  KØAZMike Sanders   EM37cd
www.k0az.com
 SouthWest
Missouri 
 


   








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Re: [Elecraft] XV50 for trade

[David G4DMP]

Mike - Assuming your XV50 has the latest PA output module (RA30H0608M)
you might like to consider modifying it for 4 metres in readiness for
when the FCC allocates the 70MHz band in the USA. I have had great
success with this.

http://www.g4dmp.co.uk/XV70mods.pdf

73 de David G4DMP

In a recent message, Mike Sanders k...@centurytel.net writes
I have a clean working XV50 no problems that I would like to trade for an
XV432.
Anyone interested? 73, Mike K0AZ   k...@centurytel.net

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

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Re: [Elecraft] XV50 for trade

[Bruce Beford]

Thanks for sharing this, David.
I don't know when or if we will ever get a 4M allocation in this country.
But, I downloaded your write-up, just in case. I have an XV50 that
languishes here. I'll have to pull the cover off and see which power module
is in it.
Cheers,
Bruce
N1RX

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David
G4DMP
Sent: Wednesday, May 14, 2014 4:33 PM
To: Mike Sanders
Cc: Elecraft Reflector
Subject: Re: [Elecraft] XV50 for trade

Mike - Assuming your XV50 has the latest PA output module (RA30H0608M)
you might like to consider modifying it for 4 metres in readiness for
when the FCC allocates the 70MHz band in the USA. I have had great
success with this.

http://www.g4dmp.co.uk/XV70mods.pdf

73 de David G4DMP

In a recent message, Mike Sanders k...@centurytel.net writes
I have a clean working XV50 no problems that I would like to trade for an
XV432.
Anyone interested? 73, Mike K0AZ   k...@centurytel.net

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

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[Elecraft] XV50 to trade

[Mike Sanders]

I have a clean working XV50 no problems that I would like to trade for an
XV432.
Anyone interested? 73, Mike K0AZ   k...@centurytel.net
 


 K0AZ
   Mike Sanders
EM37cd SW Missouri
 www.k0az.com







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[Elecraft] W2: Should my Hf-54mhz W2 be able to read my Elecraft XV50?

[Bob KD7YZ]

My Elecraft W2 nicely reads the K3 when screed into the output connector
of the K3.

However, when I attach the W2 to the back of the Elecraft XV50, which is
currently delivering about 7 watts out according to the LED.s, then
there is no reading on the W2 though the Range and Sensor LED's are lit.

-- 

Bob KD7YZ
http://www.qrz.com/db/KD7YZ
www.denstarfarm.us/LGD
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[Elecraft] XV50 Kit Has Been Sold

[Jim KO5V]

Thanks!

73, Jim KO5V
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[Elecraft] XV50 transverter CW use

[Leroy Marion]

  I just finished a XV50 transverter. Using it with a K2

with the KI02 control. 

  It seems to work OK when keyed for SSB. When I use 

CW, its relays click and chatter like mad. Do I have 

some thing set wrong?  


   Roy AB7CE
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Re: [Elecraft] XV50 transverter CW use

[Don Wilhelm]

  Roy,

Be certain you have T-R set to HOLD.  See page 89 of the manual.  The 
T-R setting determines the delay, and the 8R hold or normal settings 
will influence the behavior of the 8R signal (that signal controls the 
K2 keyout timing.

At what code speeds - yes at slow speeds, the relays will chatter no 
matter what the settings, but at 20+ wpm, the relays should hold in 
between characters.

The K2 uses silent electronic T/R switching, but the XVxxx transverters 
use relays for T/R functions.

73,
Don w3FPR

On 4/2/2011 1:11 AM, Leroy Marion wrote:
I just finished a XV50 transverter. Using it with a K2

 with the KI02 control.

It seems to work OK when keyed for SSB. When I use

 CW, its relays click and chatter like mad. Do I have

 some thing set wrong?


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[Elecraft] XV50 heating report.

[Don Wilhelm]

I had promised several here in the Elecraft reflector some temperature 
rise data for the XV50 a week ago, but had to delay it due to a failure.
Here it is now.

Conditions:  XV50 plugged for 5 watts drive = 20 watts out (attenuators 
were dissipating heat).
   This is a new XV50 with vent holes in both the bottom 
and top panels.
   Operation tested at 10 watts - keydown 1 minute, idle 
for one minute (simulated FM 
operation)  CW was actually the mode used.
   Ambient temperature 23 deg/C.
   Measurement made with temperature probe of Fluke 179 
mounted below heat spreader -
   The probe end was secured to the bottom panel with a 
solder lug temporarily placed under a   heat 
spreader mounting screw.

Interval#  Start temp   End Temp
1 2347.1
2 45.0 51.6
3 50.1 55.8
4 52.9 59.0
5 55.4 60.9
6 59.0 63.3
7 61.0 65.0
8 63.0 68.8
9 65.0 70.4
10   66.7 71,2
11   68.3 73.0

After a 1 minute cool-down, a 2 minute keydown was measured
   69.0 80.5

The time for the temperature to drop from 81 deg/C to 60 deg/C was 
measured at 4 minutes.

The receive sensitivity was measured at ambient and at 60 deg/C - the 
difference was less than 2 dB which is within the range of measurement 
error.  Spectrogram was used for this sensitivity measurement with a 
-140 dBm signal injected from an HP8640 signal generator.  The 
difference between the signal amplitude and the receiver noise floor at 
the filter passband peak was measured to determine any change in 
sensitivity.

Whether this data indicates a problem or not is not for me to determine 
- the XV50 has no temperature rise specified.  Yes, it does get hot with 
the 1 minute on, 1 minute off cycling.  Too hot to comfortably touch.  
Whether this cycling time is typical of your operation is also not for 
me to determine.  A greater non-transmit time will allow the XV50 to 
cool between transmit cycles and limit the temperature rise.

Mitsubishi specs the *operation* case temperature range to be -31 to 110 
deg/C which is higher than usual, but in their datasheet notes at the 
bottom seems to recommend that the temperature be kept below 60 deg/C, 
so even that data is not consistent.  You will have to draw your own 
conclusions about the differences in the datasheet.

73,
Don W3FPR

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[Elecraft] XV50 heating report.

[Johnny Siu]

Hello Don,

Thanks a lot for your effort and the informative report.

I agree with you that the PA module should survive under the test condition.  
However, I am not sure whether such a continous high working temparture will 
eventually shorten the working life of other components.

I trust Elecraft will be happy with your effort as well.  Your work has greatly 
reduced Elecraft's work load though they should officially confirm that the XV 
transverters are perfectly ok to work under their advertised rated output (even 
too hot to be touched).

As suggested by some of the Elecrafters, a retro kit with internal fan similar 
to XV432 may be a solution to address this issue.

Through years in this reflector, I very much appreciate your contribution in 
solving my elecrafters problem.

TNX  73

Johnny VR2XMC


- 郵件原件 
寄件人﹕ Don Wilhelm w3...@embarqmail.com
收件人﹕ Elecraft elecraft@mailman.qth.net
傳送日期﹕ 2010/6/15 (二) 12:04:57 AM
主題： [Elecraft] XV50 heating report.

I had promised several here in the Elecraft reflector some temperature 
rise data for the XV50 a week ago, but had to delay it due to a failure.
Here it is now.

Conditions:  XV50 plugged for 5 watts drive = 20 watts out (attenuators 
were dissipating heat).
                  This is a new XV50 with vent holes in both the bottom 
and top panels.
                  Operation tested at 10 watts - keydown 1 minute, idle 
for one minute (simulated FM                                    
operation)  CW was actually the mode used.
                  Ambient temperature 23 deg/C.
                  Measurement made with temperature probe of Fluke 179 
mounted below heat spreader -
                  The probe end was secured to the bottom panel with a 
solder lug temporarily placed under a                          heat 
spreader mounting screw.

Interval#      Start temp  End Temp
1                    23            47.1
2                    45.0        51.6
3                    50.1        55.8
4                    52.9        59.0
5                    55.4        60.9
6                    59.0        63.3
7                    61.0        65.0
8                    63.0        68.8
9                    65.0        70.4
10                  66.7        71,2
11                  68.3        73.0

After a 1 minute cool-down, a 2 minute keydown was measured
                      69.0        80.5

The time for the temperature to drop from 81 deg/C to 60 deg/C was 
measured at 4 minutes.

The receive sensitivity was measured at ambient and at 60 deg/C - the 
difference was less than 2 dB which is within the range of measurement 
error.  Spectrogram was used for this sensitivity measurement with a 
-140 dBm signal injected from an HP8640 signal generator.  The 
difference between the signal amplitude and the receiver noise floor at 
the filter passband peak was measured to determine any change in 
sensitivity.

Whether this data indicates a problem or not is not for me to determine 
- the XV50 has no temperature rise specified.  Yes, it does get hot with 
the 1 minute on, 1 minute off cycling.  Too hot to comfortably touch.  
Whether this cycling time is typical of your operation is also not for 
me to determine.  A greater non-transmit time will allow the XV50 to 
cool between transmit cycles and limit the temperature rise.

Mitsubishi specs the *operation* case temperature range to be -31 to 110 
deg/C which is higher than usual, but in their datasheet notes at the 
bottom seems to recommend that the temperature be kept below 60 deg/C, 
so even that data is not consistent.  You will have to draw your own 
conclusions about the differences in the datasheet.

73,
Don W3FPR

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Re: [Elecraft] XV50 heating report.

[n0jrn]

I'm with you Johnny:

Don's work continues to benefit us all...

I tool the opportunity to give my XV50 a run for it's money over the 
weekend.   6 has really come into it's own here lately.

So far,  it's working flawlessly. Mine is one of the first kitted and 
has no vent holes in the covers.  I expect I'll be doing something about 
that soon.   BUT,   doesn't seem to be causing any ill affects at this 
point.

Thanks Don for your efforts.   I very much appreciate your work.

Hopefully,   I'll see a few Elecrafters on 6 soon.

Check out the spot window on DX Summit.It's current info within 3 
minutes 24/7.

73 to all :   JerryN0JRN


 Hello Don,

 Thanks a lot for your effort and the informative report.

 I agree with you that the PA module should survive under the test
 condition. However, I am not sure whether such a continuous high working
 temperature will eventually shorten the working life of other components.

 I trust Elecraft will be happy with your effort as well.
   Your work has greatly reduced Elecraft's work load though they 
 should officially confirm that the XV transverters are perfectly ok to 
 work under their advertised rated output (even too hot to be touched).

 As suggested by some of the Elecrafters, a retro kit with internal fan 
 similar to XV432 may be a solution to address this issue.

 Through years in this reflector, I very much appreciate your contribution 
 in solving my elecrafters problem.

 TNX  73

 Johnny VR2XMC

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Re: [Elecraft] XV50 cooling

[Geoffrey Mackenzie-Kennedy]

Don,

I do not like to add to your workload, but I would be interested to know if 
the heat generated by the Mitsubishi power module has any negative effect on 
the transverter's noise figure (receive mode) if you have the time to 
measure it. If I understand the layout of the XV50 correctly, the input 
circuitry of its receive path is placed quite close to the power module.

My reason for asking is that I have been considering the option of buying a 
XV50 for use in a set up dedicated only to 6m EME, rather than building a 
transverter from scratch

73,
Geoff
GM4ESD


Don Wilhelm wrote on Sunday, June 06, 2010 at 3:59 AM:



 Gentleman,

 My promised temperature rise measurements will have to be delayed a
 bit.  This XV50 has a bad power output module and I will have to wait
 for one to be sent from Watsonville.  Later next week, I will have the 
 data.

 BTW - Mitsubishi in their notes at the end of the data sheet suggest
 that the module case temperature should be limited to 60 deg/C - but
 that is too hot to touch (140 deg/F), so the excessively hot
 criteria may actually be well within the limits of tolerance - I would
 not want to hold my hand very long on a surface that is at 60 deg/C.
 Also, I do agree that other components can be affected by the
 temperature rise, but most are spec-ed at 60 deg/C, so in reality, there
 may be no problem, just a discomfort zone - details after the new
 module arrives.

 73,
 Don W3FPR




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Re: [Elecraft] XV50 cooling

[Don Wilhelm]

Geoff,

I do not have proper equipment to do a true noise figure measurement, 
but my signal generator will go down to -140 dBm, and I can give the 
number of dB above the receive noise floor for that signal strength - I 
can do that at various temperatures during the other tests.

I doubt the temperature rise will affect the active devices, but a 
change in temperature *could* alter the inductors a bit which could 
detune the input circuits slightly.  At this point, that is all speculation.

73,
Don W3FPR

Geoffrey Mackenzie-Kennedy wrote:
 Don,

 I do not like to add to your workload, but I would be interested to know if 
 the heat generated by the Mitsubishi power module has any negative effect on 
 the transverter's noise figure (receive mode) if you have the time to 
 measure it. If I understand the layout of the XV50 correctly, the input 
 circuitry of its receive path is placed quite close to the power module.

 My reason for asking is that I have been considering the option of buying a 
 XV50 for use in a set up dedicated only to 6m EME, rather than building a 
 transverter from scratch

 73,
 Geoff
 GM4ESD


 Don Wilhelm wrote on Sunday, June 06, 2010 at 3:59 AM:



   
 Gentleman,

 My promised temperature rise measurements will have to be delayed a
 bit.  This XV50 has a bad power output module and I will have to wait
 for one to be sent from Watsonville.  Later next week, I will have the 
 data.

 BTW - Mitsubishi in their notes at the end of the data sheet suggest
 that the module case temperature should be limited to 60 deg/C - but
 that is too hot to touch (140 deg/F), so the excessively hot
 criteria may actually be well within the limits of tolerance - I would
 not want to hold my hand very long on a surface that is at 60 deg/C.
 Also, I do agree that other components can be affected by the
 temperature rise, but most are spec-ed at 60 deg/C, so in reality, there
 may be no problem, just a discomfort zone - details after the new
 module arrives.

 73,
 Don W3FPR
 




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Re: [Elecraft] XV50 cooling

[Geoffrey Mackenzie-Kennedy]

Don,

Thank you.

Yes it is the possible effect on the input L-C circuit that is my main
concern.

73,

Geoff
GM4ESD


Don Wilhelm wrote:

 Geoff,

 I do not have proper equipment to do a true noise figure measurement,
 but my signal generator will go down to -140 dBm, and I can give the
 number of dB above the receive noise floor for that signal strength - I
 can do that at various temperatures during the other tests.

 I doubt the temperature rise will affect the active devices, but a
 change in temperature *could* alter the inductors a bit which could
 detune the input circuits slightly.  At this point, that is all 
 speculation.

 73,
 Don W3FPR




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Re: [Elecraft] XV50 cooling

[Tom W8JI]

 Yes it is the possible effect on the input L-C circuit 
 that is my main
 concern.

 73,

 Geoff
 GM4ESD

I would think the major concern would be elevated noise or 
change in the first stage's semiconductor device parameters 
from the receiver's input device temperature increase, not 
from tuned circuit drift or PA noise.

I can't imagine a tuned circuit wide enough to pass six 
meters drifting so far as to change sensitivity, or really 
any meaningful change on a band like six meters.

73 Tom 

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Re: [Elecraft] XV50 cooling

[Geoffrey Mackenzie-Kennedy]

Would that not depend on whether or not the source impedance presented to 
the input device has been optimised for lowest noise figure or for optimum 
power transfer? If the former then the question arises how rapidly does the 
noise figure change with small deviations from an optimum noise match, 
even if the effective loaded Q of the input circuitry is suitable to pass 
the six metre band.

I agree that the noise figure need not be very low for terrestrial 6m, but 
6m EME requires much lower noise figures when looking away from manmade 
noise sources.

73,
Geoff.


Tom W8JI wrote:

 I would think the major concern would be elevated noise or
 change in the first stage's semiconductor device parameters
 from the receiver's input device temperature increase, not
 from tuned circuit drift or PA noise.

 I can't imagine a tuned circuit wide enough to pass six
 meters drifting so far as to change sensitivity, or really
 any meaningful change on a band like six meters.

 73 Tom



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Re: [Elecraft] XV50 cooling

[Tom W8JI]

 Would that not depend on whether or not the source 
 impedance presented to the input device has been optimised 
 for lowest noise figure or for optimum power transfer? If 
 the former then the question arises how rapidly does the 
 noise figure change with small deviations from an optimum 
 noise match, even if the effective loaded Q of the input 
 circuitry is suitable to pass the six metre band.

The two primary sources of noise are from current flow in 
the input device and thermal noise. I'm not sure what 
portion of the two exist in the XV50, but almost certainly 
the semiconductor characteristics would change far more 
rapidly than the impedance of relatively broadly tuned 
matching circuits.
 

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Re: [Elecraft] XV50 cooling

[Don Wilhelm]

Gentleman,

My promised temperature rise measurements will have to be delayed a 
bit.  This XV50 has a bad power output module and I will have to wait 
for one to be sent from Watsonville.  Later next week, I will have the data.

BTW - Mitsubishi in their notes at the end of the data sheet suggest 
that the module case temperature should be limited to 60 deg/C - but 
that is too hot to touch (140 deg/F), so the excessively hot 
criteria may actually be well within the limits of tolerance - I would 
not want to hold my hand very long on a surface that is at 60 deg/C.  
Also, I do agree that other components can be affected by the 
temperature rise, but most are spec-ed at 60 deg/C, so in reality, there 
may be no problem, just a discomfort zone - details after the new 
module arrives.

73,
Don W3FPR

Don Wilhelm wrote:
 Eric,

 Have you actually measured the temperature rise?  I am interested in 
 just how much is excessively hot.
 While it does get warm, I have always found the temperatures to be well 
 within spec for the output module.

 I have an XV50 here for repair right now.  It is next in line for work, 
 and I intend to get to it this weekend.  After it is repaired, I will 
 measure the temperature rise on the bottom panel right under the heat 
 spreader.  I have a Fluke 279 with a temperature probe available.

 Report on Monday.

 73,
 Don W3FPR

 Eric wrote:
   
 I have a late-model xv144 with holes in both top and bottom panels, 
 connected to k3 with milliwatt drive. It runs excessively hot at 10w out in 
 digital mode EME when used one minute on one minute off,  so i dont think  
 just getting new panels will help you.  I use a small muffin fan blowing air 
 underneath with the xv-144 up on the optional tilt stand and this simple 
 solution works great. 

 I also use an xv-432 for eme at 10w but its internal fan keeps it cool. 

 Perhaps if enough people request a retrofit kit with an internal fan for the 
 xv-50 and xv-144 Elecraft would consider it.  I'd pony up. The fan could 
 attach inside the top panel. 

 73

 Eric WD6DBM 

   
 
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[Elecraft] XV50 cooling

[Eric]

I have a late-model xv144 with holes in both top and bottom panels, connected 
to k3 with milliwatt drive. It runs excessively hot at 10w out in digital mode 
EME when used one minute on one minute off,  so i dont think  just getting new 
panels will help you.  I use a small muffin fan blowing air underneath with the 
xv-144 up on the optional tilt stand and this simple solution works great. 

I also use an xv-432 for eme at 10w but its internal fan keeps it cool. 

Perhaps if enough people request a retrofit kit with an internal fan for the 
xv-50 and xv-144 Elecraft would consider it.  I'd pony up. The fan could attach 
inside the top panel. 

73

Eric WD6DBM 

Sent from my ePhone (I wish)
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Re: [Elecraft] XV50 cooling

[Don Wilhelm]

Eric,

Have you actually measured the temperature rise?  I am interested in 
just how much is excessively hot.
While it does get warm, I have always found the temperatures to be well 
within spec for the output module.

I have an XV50 here for repair right now.  It is next in line for work, 
and I intend to get to it this weekend.  After it is repaired, I will 
measure the temperature rise on the bottom panel right under the heat 
spreader.  I have a Fluke 279 with a temperature probe available.

Report on Monday.

73,
Don W3FPR

Eric wrote:
 I have a late-model xv144 with holes in both top and bottom panels, connected 
 to k3 with milliwatt drive. It runs excessively hot at 10w out in digital 
 mode EME when used one minute on one minute off,  so i dont think  just 
 getting new panels will help you.  I use a small muffin fan blowing air 
 underneath with the xv-144 up on the optional tilt stand and this simple 
 solution works great. 

 I also use an xv-432 for eme at 10w but its internal fan keeps it cool. 

 Perhaps if enough people request a retrofit kit with an internal fan for the 
 xv-50 and xv-144 Elecraft would consider it.  I'd pony up. The fan could 
 attach inside the top panel. 

 73

 Eric WD6DBM 

   
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Re: [Elecraft] XV50 cooling

[n0jrn]

Evening gang:

Just got home from work and reading my male.I looked at the manual for 
the XV432 to see how the internal fan is mounted and how it was hooked up. 
It really doesn't look like much of a task to modify my XV50 and install 
such a fan.

I contacted sales and was told the vented panels are not available.  As much 
as I hate drilling my own panels  ( don't like messing up the paint )   I 
see very little challenge in copying what Elecraft did with the 432 version.

I will wait Don, to hear the results of your tests before doing anything.

73 to all; Jerry N0JRN

On 6/3/2010 1:18:45 PM, Eric (gliderboy1...@yahoo.com) wrote:
 I have a late-model xv144 with holes in both top and bottom panels,
 connected to k3 with milliwatt drive. It runs excessively hot at 10w out

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Re: [Elecraft] XV50 cooling

[Eric]

Well, as I recall I could not hold my hand on it, but i only ran it without a 
fan once when I first built it and my memory is hazy.  

 Remember digital EME is one minute on, one minute off for hours. I have run 
four hours at a time that way without a break, and I'm sure others run longer.

Maybe it was still in spec, but why push it?  All that extra heat can't 
possibly make the XV more stable or less prone to failure than if it were 
running at room temp. Mine does have the xtal oven if that makes a difference.  
I don't know how much heat that adds to the system. 

73,

Eric WD6DBM 

Sent from my iPhone

On Jun 3, 2010, at 4:18 PM, Don Wilhelm w3...@embarqmail.com wrote:

Eric,

Have you actually measured the temperature rise?  I am interested in just how 
much is excessively hot.
While it does get warm, I have always found the temperatures to be well within 
spec for the output module.

I have an XV50 here for repair right now.  It is next in line for work, and I 
intend to get to it this weekend.  After it is repaired, I will measure the 
temperature rise on the bottom panel right under the heat spreader.  I have a 
Fluke 279 with a temperature probe available.

Report on Monday.

73,
Don W3FPR

Eric wrote:
I have a late-model xv144 with holes in both top and bottom panels, connected 
to k3 with milliwatt drive. It runs excessively hot at 10w out in digital mode 
EME when used one minute on one minute off,  so i dont think  just getting new 
panels will help you.  I use a small muffin fan blowing air underneath with the 
xv-144 up on the optional tilt stand and this simple solution works great. 
I also use an xv-432 for eme at 10w but its internal fan keeps it cool. 
Perhaps if enough people request a retrofit kit with an internal fan for the 
xv-50 and xv-144 Elecraft would consider it.  I'd pony up. The fan could attach 
inside the top panel. 
73

Eric WD6DBM 
 

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[Elecraft] XV50 Cooling

[n0jrn]

OK gang:

I've seen a number of posts in the archive about drilling holes in the 
panels to cool a transverter.

None of those posts are very specific about where your drilling the holes.

Can some of you who have done this,  tell me where you did that ???

ORdoes Elecraft make panels available that are pre-drilled ?? 
( I don't see then in the products list )

Just curious !

73 JerryN0JRN 

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Re: [Elecraft] XV50 Cooling

[Don Wilhelm]

Jerry,

There are holes in the top cover that are supposed to be positioned 
above the attenuator resistors, and the new transverters have holes on 
the bottom on either side of the power module.  I am looking at a rather 
new XV50 right now that has come in to me for repair.  The builder did 
not position the top cover holes over the attenuator resistors, but the 
holes are in the cover.
If you are driving the transverter from the low power outputs, the 
attenuator resistors are not used, so that source of heat is a no-op, 
but the resistors will heat up if higher power is used to drive the 
transverter.

I do not believe additional ventilation holes are needed in most cases.  
If air flow below the transverter is available (do not operate it 
without the feet), the cooling is adequate.  It seems to me that some 
operators get concerned with any heat generation, but in reality, if it 
is cool enough you can place your hand on it for more than 30 seconds, 
it is not hot enough for concern.

Earlier transverters did not have the holes in the bottom panel, and 
some very early ones did not have the vent holes in the top cover.  Yes, 
these may need additional vent holes, especially over the attenuator 
resistors.

73,
Don W3FPR

n0jrn wrote:
 OK gang:

 I've seen a number of posts in the archive about drilling holes in the 
 panels to cool a transverter.

 None of those posts are very specific about where your drilling the holes.

 Can some of you who have done this,  tell me where you did that ???

 ORdoes Elecraft make panels available that are pre-drilled ?? 
 ( I don't see then in the products list )

 Just curious !

 73 JerryN0JRN 

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Re: [Elecraft] XV50 Cooling

[n0jrn]

Thanks Don:

I bought this unit unbuilt from another list member and it is a very early 
model.   It has no vent holes at all !

I am driving with low power and therefore have the attenuator resistors 
bypassed.  So not worried about heat from that area.

I do have the feet on the transverter so air flow under it is good.

My concern stems from a reduction of output power after using the unit non 
stop for a period of time.  My fear is the power module is getting hot and 
falling off some.

Module was installed using the heat transfer pads correctly located.I 
did not use heat sink compound.

This unit has the old style power module in it  ( M57735 )
This predates requirement of setting the PA bias in the XV50.

Just thought I would give it a little more air to help my PA live a little 
longer. :-)

Guess I'll drop Gary a note and see if he has a spare set of panels.

Thanks again Don and have a great day.

73  Jerry  N0JRN

On 6/2/2010 10:36:44 AM, Don Wilhelm (w3...@embarqmail.com) wrote:
 Jerry,

 There are holes in the top cover that are supposed to be positioned
 above the attenuator resistors, and the new transverters have holes on
 the bottom on either side of the power module.  I am looking at a rather
 new XV50 right now that has come in to me for repair.  The builder did
 not position the top cover holes over the attenuator resistors, but the
 holes are in the cover.
 If you are driving the transverter from the low power outputs, the
 attenuator resistors are not used, so that source of heat is a no-op,
 but the resistors will heat up if higher power is used to drive the
 transverter.

 I do not believe additional ventilation holes are needed in most cases.
 If air flow below the transverter is available (do not operate it
 without the feet), the cooling is adequate.  It seems to me that some
 operators get concerned with any heat generation, but in reality, if it
 is cool enough you can place your hand on it for more than 30 seconds,
 it is not hot enough for concern.

 Earlier transverters did not have the holes in the bottom panel, and
 some very early ones did not have the vent holes in the top cover.  Yes,
 these may need additional vent holes, especially over the 

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[Elecraft] XV50 going into Overload

[n0jrn]

Gang:   having some problems with my XV50 going into overload.  I'm 
looking for some ideas of how to isolate the problem.

Wondered if anyone else has had a problem and what you did to address it. 
Not much about this in the archives.

I have installed the bypass caps per the last builders alert.

That didn't help this issue.   Doesn't matter which mode I'm running.  Still 
does it ! I am running vox when in SSB.

Anyway, just curious if anyone has any pointers.

Thanks and 73:JerryN0JRN 

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Re: [Elecraft] XV50 going into Overload

[Don Wilhelm]

Jerry,

Are you referring to the Overload Detector being tripped?
If so, try adding a .01 uF capacitor between the base and emitter of 
Front Panel Q7.
It seems some 2Ns are a bit more sensitive to noise on the overload 
detector output line.
I know of at least 2 that were cured with this fix.  Very few 
transverters have this problem, but for those that do, it is an easy fix..

73,
Don W3FPR

n0jrn wrote:
 Gang:   having some problems with my XV50 going into overload.  I'm 
 looking for some ideas of how to isolate the problem.

 Wondered if anyone else has had a problem and what you did to address it. 
 Not much about this in the archives.

 I have installed the bypass caps per the last builders alert.

 That didn't help this issue.   Doesn't matter which mode I'm running.  Still 
 does it ! I am running vox when in SSB.

 Anyway, just curious if anyone has any pointers.

 Thanks and 73:JerryN0JRN 

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[Elecraft] XV50 resistors

[n0jrn]

Just a quick question about the manual for the XV50

R23 on the RF board shows to use 100K in the parts breakdown and in the text 
it shows 120 ohm.

I had enough 120 ohm resistors to fill all spot and ended up with an extra 
100K.

Which one is correct to use for R23.

Thanks and 73:

Jerry  N0JRN 

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Re: [Elecraft] XV50 resistors

[David Pratt]

Jerry - Don't confuse the list of RF board components with those for the 
front panel.  You'll see that R4 and R5, among others, have different 
values on the RF board to those on the front panel.

73

David G4DMP

In a recent message, n0jrn n0...@mchsi.com wrote ...

Just a quick question about the manual for the XV50

R23 on the RF board shows to use 100K in the parts breakdown and in the text
it shows 120 ohm.

I had enough 120 ohm resistors to fill all spot and ended up with an extra
100K.

Which one is correct to use for R23.

Thanks and 73:

Jerry  N0JRN
-- 
+- - - - - - - - - - - - - - - - - - - - -+
| David M Pratt G4DMP, Kippax, Leeds, UK  |
| K1 #1117; KX1 #0052; K2 #1583; K3 #0186 |
+- - - - - - - - - - - - - - - - - - - - -+



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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[David Pratt]

Many thanks to all who replied to my query about the vent holes in the 
top cover of the XV144. There weren't any on mine, so I drilled some 
over the Metox resistors in the RF power attenuator (R20, R21, R26, 
R27).

With particular thanks to Johnny VR2XMC, I have now completed my mods to 
the XV144 by adding a fan, similar to that used in the XV432 and 
drilling vent holes in the base plate.

Although I am only driving the XV144 with 1mW from either the K2 or K3, 
heating of the resistors was not a problem, but hot air is now coming 
out of the top vent holes when I am transmitting.

Hopefully, the mods will enable the XV144 PA module to run cooler and it 
will not shut down after I have been transmitting for more than a few 
minutes.

73
-- 
David G4DMP
Leeds, England, UK
--



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[Elecraft] XV50, XV144, XV222 Assembly Manual

[David Pratt]

I have just been reading the Transverter XV50, XV144, XV222 Assembly 
Manual Rev B, March 2006 and notice on page 2 that the top cover has 
ventilation holes drilled in it.  My XV144 does not have any ventilation 
holes.

Should I drill some vent holes in the top cover, over the four 
metal-oxide resistors?  My XV144 does get hot and sometimes trips out if 
I transmit more than a few minutes. (Presumably F1, the resettable 
fuse.)

As there is space on the RF Board for a fan, similar to that used on the 
XV432, I am wondering whether there would be any advantage fitting a 
40mm x 40mm fan to the XV144?  Presumably, I would need to drill 
air-flow holes in the PCB and also in the bottom cover.

73
-- 
David G4DMP
Leeds, England, UK
--



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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[Radio Amateur N5GE]

On Sat, 12 Dec 2009 20:01:45 +, David Pratt
da...@g4dmp.fsnet.co.uk wrote:

I have just been reading the Transverter XV50, XV144, XV222 Assembly 
Manual Rev B, March 2006 and notice on page 2 that the top cover has 
ventilation holes drilled in it.  My XV144 does not have any ventilation 
holes.

Should I drill some vent holes in the top cover, over the four 
metal-oxide resistors?  My XV144 does get hot and sometimes trips out if 
I transmit more than a few minutes. (Presumably F1, the resettable 
fuse.)

As there is space on the RF Board for a fan, similar to that used on the 
XV432, I am wondering whether there would be any advantage fitting a 
40mm x 40mm fan to the XV144?  Presumably, I would need to drill 
air-flow holes in the PCB and also in the bottom cover.

73

No need to drill the holes or get a fan for any of the other XV
Models.  They don't get hot like the XV432 does.

Tom, N5GE

n...@n5ge.com
K3 #806 with SUB RX, K3 #1055, PR6,
XV144, XV432, KRC2,
W1, 2 W2's and other small kits

1 K144XV on order

http://www.n5ge.com
http://www.swotrc.net

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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[Giulio Pico - IW3HVB]

I'm not so sure about this, at least for the holes.
My old XV144 have them since it came out of the factory...,
Maybe it is a simple packing mistake.
Try ask to elecraft support, maybe they can clear it out.

73 de Giulio IW3HVB
 No need to drill the holes or get a fan for any of the other XV
 Models.  They don't get hot like the XV432 does.

   

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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[Don Wilhelm]

David,

The holes only vent the attenuators, the heat sink for the output module 
is the bottom plate.
Whether the attenuators need venting or not depends on your drive level 
- the attenuators are not used at all for 1 mW input, so if that is what 
you are using, rest easy.

I am curious about why your top cover does not have the holes.  It is 
possible that you received an incorrect cover.  If this was a recent 
purchase, things like that are covered under warranty, contact 
pa...@elecraft.com with a brief explanation and you may receive the 
right cover.

73,
Don W3FPR

David Pratt wrote:
 I have just been reading the Transverter XV50, XV144, XV222 Assembly 
 Manual Rev B, March 2006 and notice on page 2 that the top cover has 
 ventilation holes drilled in it.  My XV144 does not have any ventilation 
 holes.

 Should I drill some vent holes in the top cover, over the four 
 metal-oxide resistors?  My XV144 does get hot and sometimes trips out if 
 I transmit more than a few minutes. (Presumably F1, the resettable 
 fuse.)

 As there is space on the RF Board for a fan, similar to that used on the 
 XV432, I am wondering whether there would be any advantage fitting a 
 40mm x 40mm fan to the XV144?  Presumably, I would need to drill 
 air-flow holes in the PCB and also in the bottom cover.

 73
   
 


 No virus found in this incoming message.
 Checked by AVG - www.avg.com 
 Version: 9.0.716 / Virus Database: 270.14.104/2560 - Release Date: 12/12/09 
 02:38:00

   
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[Elecraft] XV50, XV144, XV222 Assembly Manual

[James Duffey]

My XV222 runs hot after a few minutes of contest activity with 20W output, 5W 
input on SSB or CW. I have not operated it on FM. Running at 15W helps a bit, 
but it is still warmer than I feel comfortable with. I have a linear and can 
drive that with 10w to 15w, so that helps, but if you are expecting a high duty 
cycle 20W transverter, the XV222 isn't it.

If the fan helps, I hope Elecraft makes a retrofit kit available. Not sure if I 
have vent holes fo rthe attenuator resistors or not; I need to check. - Duffey
--
KK6MC
James Duffey
Cedar Crest NM





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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[Radio Amateur N5GE]

On Sat, 12 Dec 2009 22:39:28 +0100, Giulio Pico - IW3HVB
iw3...@gmail.com wrote:

I guess my XV144 doesn't get hot because I drive it with 1mw.  There
are holes in it above the attenuation resistors. 

73,

Tom, N5GE

n...@n5ge.com
K3 #806 with SUB RX, K3 #1055, PR6,
XV144, XV432, KRC2,
W1, 2 W2's and other small kits

1 K144XV on order

http://www.n5ge.com
http://www.swotrc.net 

I'm not so sure about this, at least for the holes.
My old XV144 have them since it came out of the factory...,
Maybe it is a simple packing mistake.
Try ask to elecraft support, maybe they can clear it out.

73 de Giulio IW3HVB
 No need to drill the holes or get a fan for any of the other XV
 Models.  They don't get hot like the XV432 does.

   

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Re: [Elecraft] XV50, XV144, XV222 Assembly Manual

[David Pratt]

It's a fairly early purchase, Don, and has a steel top cover with no 
vent holes.  It is a pity that the XV--- transverters do not have serial 
numbers so they can be identified.  I will drill 30 holes in the area of 
the Metox resistors.

In a recent message, Don Wilhelm w3...@embarqmail.com wrote ...
I am curious about why your top cover does not have the holes.  It is 
possible that you received an incorrect cover.  If this was a recent 
purchase, things like that are covered under warranty, contact 
pa...@elecraft.com with a brief explanation and you may receive the 
right cover.

73

David
-- 
David G4DMP
Leeds, England, UK
--



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[Elecraft] XV50 Transverter (and more) for Sale

[Ken Alexander]

Several of my previously listed items have sold.  The transverter and Heil 
Proset are still available at lower prices:

1.  Elecraft XV50 6m transverter.  Less than 1 yr old.  Like-new condition and 
works very well.  $325.00  (was $350.00)

2.  Heil Proset with HC4 element.  That's the DX/contesting element.  Comes 
with adapter for Yaesu transceivers with RJ type mic connector.  (I have 
replaced the original 1/4 headphone plug with a 1/8 plug)  $80.00 (was 
$100.00)

Prices are in U.S. dollars.  I will ship anywhere in Canada or continental U.S. 
at my expense.

Please contact me off-list.

Thank you  73,

Ken Alexander
VE3HLS

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[Elecraft] XV50 Alignment Questions

[Ken Alexander]

I'm working on Part V of the alignment RF Power Amplifier Quiescent Current 
Adjustment, which calls for R39 to be adjusted for a reading of 20 mV.  The 
most I can get out of it is 18.5 mV.  Is that close enough?

Part VI - Filter Alignment:  When keying the transmitter and adjusting L12 to 
L17 the readings on my DMM are all over the map; they usually fall from an 
initial reading and settle down after 10 seconds or so.  Then they swing around 
a fair bit such that only gross movements of the slugs are visible.  Unkey the 
transmitter, move the diddle stick to the next slug and rekey the transmitter 
and you're starting with a whole new set of numbers.  Again, fine adjustments 
of the slug are masked by the constant variation of the voltage.  Any ideas?

Once again, any thoughts would be greatly appreciated.

73,

Ken Alexander, VE3HLS

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[Elecraft] XV50 For Sale

[Ian Parker]

Selling XV50 with oven and manual.
 
$340 inc shipping to lower 48 states !
 
pse contact me off list.
 
Regards
Ian W6TCP
 
 
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[Elecraft] XV50 and XV432 Transverters

[Dave Smith]

Friends,

 

Does anyone have any of these transverters for sale? If so please contact me
because I am interested.

 

73.

 

Dave / W6TE

559 323-6095

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[Elecraft] XV50 question

[DW Holtman]

Hello,

I finally finished my XV50, got it debugged and working. Now there is one more 
problem/question.

I setting up the configuration, I set the low power out of the K60XV to 1.0 MW. 
When I have everything connected, and operating, the display shows that the K2 
is only putting our about 0.3 MW instead of 1.0 MW. Is this adjustable? It will 
only allow about 8 or 9 watts out of the XV50 instead of 20 Watts, with 
everything properly aligned.

Thank you for your help.

Best,
DW Holtman
WB7SSN
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Re: [Elecraft] XV50 question

[Don Wilhelm]

DW,

Do you also have the KAT2 installed in your K2?
If you do, did your see the note with the K60XV that the KAT2 R6 value 
must be increased to 470 ohms?


Also:
The power knob does control the power output from the low power output 
jack on the K2.  With the power knob set at full rotation, what is the 
power output displayed by the K2?


73,
Don W3FPR

DW Holtman wrote:

Hello,

I finally finished my XV50, got it debugged and working. Now there is one more 
problem/question.

I setting up the configuration, I set the low power out of the K60XV to 1.0 MW. 
When I have everything connected, and operating, the display shows that the K2 
is only putting our about 0.3 MW instead of 1.0 MW. Is this adjustable? It will 
only allow about 8 or 9 watts out of the XV50 instead of 20 Watts, with 
everything properly aligned.

Thank you for your help.

Best,
DW Holtman
WB7SSN
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Re: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

I have now completed my modification by installing the replacement power
module. The changes required to fit the new module are very simple, it is
just a matter of removing 2 links and one inductor and installing one link
and two resistors, plus the module.

Power output of 20W was achieved immediately for  -20 dBm input. The power
will easily go beyond 30W but the heatsinking is not adequate even for 20W
so I recommend keeping it to 10W or less. If the gain is too high, the
resistor supplying the driver stage could usefully be changed to the same
value as in the XV144.

My receiver noise figure measurement attempts were thwarted by our local 70
MHz beacon. However, setting the measurement bandwidth to 100kHz allowed me
to measure the noise figure at 69MHz which was ~1.5 dB. This could no doubt
be improved by replacing L1, but is good enough for 70MHz already.

I have not done a 2 tone test yet, I will try this later. The results should
be as good as the XV50 and 10W is will below the maximum output.

Mike

PS - Can anyone make an appropriate XV70 indicator for the front?
-- 
View this message in context: 
http://www.nabble.com/XV50-on-70MHz-tp14067091p14730575.html
Sent from the Elecraft mailing list archive at Nabble.com.

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[Elecraft] XV50 on 70MHz

[Allan Duncan]

Hi,

Here are my component values I used to convert my XV50 to 70MHz. 

I have included the Mouser part numbers but, as previously discussed, some
parts now have huge minimum order quantities. Don W3FPR mentioned that could
be because they have been replaced by a ROHS compliant part. I have not been
able to find that replacement part in their PDF catalogue but I suspect Don
is correct.



Mouser Part No.

C42  C43  47pF 80-C1206C470J5G

C44  100pF  80-C1206C101J5G

L1  5.5 turn inductor   434-1012-5.5C

L10  L11 4.5 turn inductor 434-0712-4.5C

L12, L13  L14 4.5 turn shld inductor   434-1012-5.5CS

With L1 changed to the value stated, C1 seems to align around its midpoint.

I also changed Q1 to an MPS918 and changed the circuit to be the same as the
LO circuit in the XV144 but with C12 10pF, C14 47pF. This removes the
ability to frequency calibrate the LO but as I use the transverter with my
K2 I can correct any error in the K2 firmware in a similar way to the XV144

I took the view that the filter on the output of the LO is only fitted to
the XV50 as the 2nd harmonic of the 22Mhz is 44MHz and a bit close to 50MHz.
With a 42MHz LO the 84MHz is far enough away not to get through RF bandpass
filter (L12, L13, L14, C45, C46 etc). So I omitted C59, C58 and L3. I will
recheck the TX spurious sometime - it would be easy to retrofit those
components.

I understand that the new XV50 kits contain the RA30H0608M (70MHz) module in
place of the M57735 which simplifies the modifications significantly so I
have not included those details here.

The modifications are really fairly trivial. The only tricky bit is changing
the SMD capacitors C42, C43 and C44. This needs a steady hand.

I guess that if the crew at Aptos had more time it would be possible to
offer an official XV70. If nothing else, it would be nice to have a XV70
LED indicator label for the front panel!

I am very pleased with the performance of my XV50 on 70MHz - maybe I need to
consider a getting a K3 to use with it as well?

73

Allan 
GM4ZUK



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Re: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

Also see http://www.mike-willis.com/XV70_Pt1.htm for some alternatives. This
document is not finished yet, I still need to document the power amplifier
conversion though this is effectively already documented in the most recent
XV50 manuals.

Mike
-- 
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Re: [Elecraft] XV50 on 70MHz

[David Ferrington, M0XDF]

Great stuff Mike


On 9/1/08 11:28, AD6XY - Mike [EMAIL PROTECTED] sent:

 
 
 Also see http://www.mike-willis.com/XV70_Pt1.htm for some alternatives. This
 document is not finished yet, I still need to document the power amplifier
 conversion though this is effectively already documented in the most recent
 XV50 manuals.
 
 Mike

-- 
The trees that are slow to grow bear the best fruit.
-Moliere, actor and playwright (1622-1673)


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Re: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

Specifying them is easy, getting them is more difficult. The problem is the
part numbers used by Elecraft do not relate to something you can actually
order. We need to find out what the actual part numbers are and order the
coils with the next lower inductance.

 

M0XDF wrote:
 
 Well, I'd be doing this on a new unbuilt XV50, so if changing coils is
 good and someone can document what that change is ...
 
 I'm quite capable of assembly, but not of design.
 
 
 AD6XY - Mike wrote:
 
 The coils should really change too but will be very tricky to remove.
 Currently as a result the filter is a little lossy and not very sharp.
 
 
 

-- 
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http://www.nabble.com/XV50-on-70MHz-tp14067091p14685202.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] XV50 on 70MHz

[David Ferrington, M0XDF]

We could try asking Elecraft for the part number of those components - I
think they are a little busy right now, but give it a month or two


On 8/1/08 09:31, AD6XY - Mike [EMAIL PROTECTED] sent:

 
 Specifying them is easy, getting them is more difficult. The problem is the
 part numbers used by Elecraft do not relate to something you can actually
 order. We need to find out what the actual part numbers are and order the
 coils with the next lower inductance.
 
  
 
 M0XDF wrote:
 
 Well, I'd be doing this on a new unbuilt XV50, so if changing coils is
 good and someone can document what that change is ...
 
 I'm quite capable of assembly, but not of design.
 
 
 AD6XY - Mike wrote:
 
 The coils should really change too but will be very tricky to remove.
 Currently as a result the filter is a little lossy and not very sharp.
 
 
 

-- 
I never did a day's work in my life; it was all fun. -Thomas Edison


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RE: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

Thanks Allan,

I have managed now to get to an output of about 0 dBm from the driver stage.
I have not got the power module in as I doubt it will work on 70MHz. I will
replace it with one that does.  The 0 dBm is a little disappointing but I
know why and am working on fixing that.


The harmonic trap you mention is actually a low pass filter. I have modified
it for 42MHz. I have also modified the low pass filter at the output. 

The band pass filter is currently half modified, the same coils but
different Capacitors. When I completely finish the modification, I will post
a link to a web page with the full details. If it is ppossible to maintain
performance with the original coils, it is a much better option than buying
10,000 to replace 3 of them.

I am interested in your component values, especially for the LNA 

Mike



Allan Duncan-3 wrote:
 
 
 
 Hi 
 
 I converted an XV50 to 70MHz at the end of 2006 and have used it (with my
 K2) on SSB and CW during a few of the RSGB 70MHz contests in 2007. I have
 been very pleased with the performance of that combination - particularly
 on
 CW.
 
 I have access to a modern spectrum analyser - both the two tone TX IMD and
 spurious performance were similar to an unmodified XV50.
 
 I purchased replacement L's and C's from Mouser in the USA. The L's are
 made
 by a company called Xicon and are identical to those originally fitted. I
 suspect that Mouser supply Elecraft themselves with the L's in their
 transverter designs.  
 
 Unfortunately, since I purchased mine, the minimum order quantity for
 these
 has been increased from 1 to 10,000 from Mouser (www.mouser.com) and I
 have
 been unable to find another supplier anywhere.
 
 The XV50 2nd harmonic trap (C58, C59 and L3) will need to be removed for
 70MHz. 
 
 If I get a chance this evening, I will post my component values I used to
 modify my XV50 to 70MHz.
 
 73
 
 Allan
 GM4ZUK
 
 
 
 
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Re: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

I am working on it. My plan is to make as few changes as possible while
maintaining adequate performance. This will be a compromise but should make
it easier to modify existing units.

I will put the instructions on my web pages (www.mike-willis.com) when
ready. I have done the design work but I am now waiting for some parts to
arrive before testing the modifications. The longest lead item is the 42MHz
crystal. 

The most expensive new part will be the power module, though not for new
builds as Elecraft are now using a MosFET module that covers 70MHz already.

Mike

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Re: [Elecraft] XV50 on 70MHz

[M0XDF]

I too would be interested in buying an XV70, or a XV50 kit and applying mods
as part of my build.

-- 73, M0XDF, K3 #174


Trevor Day wrote:
 
I think an Elecraft “XV70” would do well in
Europe as there is a lack of any competition for equipment on this rapidly
expanding band. 
 


-
73 de M0XDF FISTS #12575 :working:
Waiting for Elecraft K3
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Re: [Elecraft] XV50 on 70MHz

[AD6XY - Mike]

I am making good progress. I managed to find an XV50 locally to do a trial
conversion. I will end up with two but perhaps someone will want one of
them. It has taken 5 hours because I was also writing the documentation
which will be on my web pages.

So far, I have managed to get the receive side working. I have converted the
LO to operate at ~42 MHz with a 3rd overtone crystal and inductive tuning.
My LO is actually 41MHz as I only had a crystal for that frequency. I have
re-tuned the LO filter and see a nice clean signal on my scope. 

To bring the converter into band I only changed the resonator and
input/output capacitors in the mixer band pass filter. The coils should
really change too but will be very tricky to remove. Currently as a result
the filter is a little lossy and not very sharp.

I have not yet modified the front end preamplifier, I found it almost tunes
with minimum C1. It works well enough to allow me to receive signals on the
band, limited by band noise.  I will look at improving the preamplifier but
so far have left it alone to avoid the risk of damaging the FET.  Conversion
gain, 70.25MHz to 29.25MHz is 24 dB. 

Later in the week I will start to pay attention to the transmitter side and
replacing the PA module and low pass filters.


Mike
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Re: [Elecraft] XV50 on 70MHz

[M0XDF]

Well, I'd be doing this on a new unbuilt XV50, so if changing coils is good
and someone can document what that change is ...

I'm quite capable of assembly, but not of design.


AD6XY - Mike wrote:
 
 The coils should really change too but will be very tricky to remove.
 Currently as a result the filter is a little lossy and not very sharp.
 


-
73 de M0XDF FISTS #12575 :working:
Waiting for Elecraft K3
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[Elecraft] XV50, XV144, etc

[WB6TMY K2 S/N 838]

Am interested in purchasing a used transverter(s)

Does anyone have any they would like to sell me?

Tel: . . . 707-832-4304  


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[Elecraft] XV50: Birdie Problem

[JT Croteau]

I have a birdie problem too close for comfort to the 50MHz SSB calling
frequency of 50.125.  The noise is about 22 dB above the noise floor
at it's peak.  The noise starts to come into my passband around
50.125.35 and is present for ~ 2 KHz.

Here is a spectrogram plot of it taken at 50.126.45:
http://n1ese.qrpradio.com/images/birdie.jpg

and here is a recording I made as I tune the VFO from 50.125 through 50.128:
http://n1ese.qrpradio.com/sounds/50mhzBirdie.mp3

Any ideas how to track down something like this and does it look like
a problem internal to my K2 or XV50 or does it sound like it might be
external somewhere in the environment around the shack?

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH (FN42gx)
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[Elecraft] XV50: Off by 2.3 KHz

[JT Croteau]

Finished building and testing my XV50 a few days ago and just raised
the antenna this afternoon.  I have a zero-beat ofthe local beacon at
50066.60 MHz but the owner of the beacon assures me it is transmitting
on 50064.30 MHz.

Lacking any testing equipment, what can I do to better align this?  I
am pretty certain the K2 is properly aligned with WWV @ 10 MHz.

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH (FN42gx)
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Re: [Elecraft] XV50: Off by 2.3 KHz

[David Wilburn]

Sorry, this was the XV50 thread.  I replied to the wrong one.  I 
changed this subject to match.


David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
FP#-1751


David Wilburn wrote:
Is the beacon generating a specific tone?  WWV generates 500, and 600 Hz 
tones, as well as others.  Spectrogram can be used to calibrate if a 
tone is available from the beacon.  N0SS site has downloads of the last 
shareware version.



David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
FP#-1751


Darwin, Keith wrote:

Yea, I think we have.  Or at least the list has shifted and isn't the
same as it was.

It is the K3's fault.

Prior to the K3, we were all engaged in buying  building K1, K2, KX1
and mini-module units.  Now with the K3, I suspect most of us are on
hold.  We've ordered our K3 but are not ordering K1s, K2s, KX1s since we
need that money to pay for the K3.

My plans have changed.  I was planning on a K1.  Instead I'm in K3
limbo, waiting for my order to be filled.  I was planning on the DSP for
my K2 but no longer.  K3 will do that.

So with no building going on at my QTH there's nothing to talk about
except K3 deliveries, iambic paddles, and silly blonde jokes.

Will it ever come back?  Once the K3 gets out there I bet you'll see a
bunch of traffic about the assembly and operation of that rig.
Eventually the K3 wave will subside somewhat and you'll see more K1/2/X1
posts in the mix.  I bet it will take many months (years?) though.

Of course, when Elecraft comes out with the KPA800 and KPA1500 kits,
that will stir a bunch of kit building posts again.

- Keith N1AS -
- K2 5411.ssb.100 -
- K3 Wave 3 -
-Original Message-
From: john-n4dsp

This reflector used to be a Gold Mine for builders. It was fun sifting
through it and learning what others were experiencing and solutions
being offered by the Ron, Don, and Tom.

Lately it has become a place to post comments and feelings and most of
the time nothing related to the reflector's original intention. Am I the
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[Elecraft] XV50: Problem with Errata C-4

[JT Croteau]

I'm trying to build my first XV, an XV50, and I just hit a road block.

First, the page number references in the C-4 Errata don't match those
in my Rev. C manual.

#1 Page 25, Right Column, Second Step: Remove L17 from the list.  (The
tuning slug for L17 should be left in the inductor).

I'm confused by this for a couple reasons.  First, page 25 has no
reference to L17.  In fact, on page 25 you are just wrapping up the
front panel assembly.  Second, where you are about to install L17 on
page 33, there is no mention about removing any of the slugs.  It just
says to run the cores up and down and then set near the top of the
coil.  On page 34, you solder them in.

So, what am I actually supposed to do with L17?  Install it as normal?

Then, the next step:

#2 Page 25, Right Column, Second Step: After L10 add In the XV50,
the inductor is a toroid and has no slug.

Ok, I think I can figure this out but, again, the page numbers don't
match and it actually references the same step as the first item.

The page numbers for the remaining steps 3, 4, and 9 also don't seem
to make sense but they are alignment issues and I think I can figure
them out.

I am really becoming disappointed with the quality of Elecraft's
documentation of late.  I had a number of documentation issues with my
Rev. G manual K2 build.  Several parts were substituted with different
parts and not documented in any type of Errata and there were several
formatting issues with the parts tables.  Several part numbers were
cut off and/or didn't fit in the cells.  I had emailed my
documentation issues as I found them to Elecraft but I only ever
received a reply on one of them.  I hope the problems with the
documentation aren't signs that Elecraft is too narrowly focused on
the K3 at the moment and neglecting current products.

Thanks for any help on just what to do with L17.  I presume I'm to
just install it as I do L15 and L16.

-- 
JT Croteau, N1ESE - Manchester, NH (FN42gx)
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RE: [Elecraft] XV50: Building my first XV

[Ron D'Eau Claire]

Hi, JT. 

You'll find building the XV50 a snap after building the K2. It's a much
simpler piece of equipment, of course, and most of the circuitry is laid out
on one spacious pc board. 

Ron AC7AC

-Original Message-

Are the Elecraft XV's any more difficult to build than a K2?  To my surprise
and limited skills, I was able to build my K2 along with several options
successfully with only minor difficulties.  My soldering job isn't the
cleanest in the world but the rig works as spec'd.  However, with that said,
I could see my soldering improving as I progressed from stage to stage.  My
biggest problem is feeding too much solder into the joint.  I think I need
to switch to a smaller diameter solder.

I'd like to procure an XV50 around the first week of October. However, this
will be cutting it close time wise for it's intended purpose; the 50MHz
Sprint on October 20th.  However, this shouldn't be much of a problem as I
am currently disabled and have more time than I know what to do with lately.

Thanks for any feedback.

-- 
JT Croteau, N1ESE - Manchester, NH
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[Elecraft] XV50: Building my first XV

[JT Croteau]

Are the Elecraft XV's any more difficult to build than a K2?  To my
surprise and limited skills, I was able to build my K2 along with
several options successfully with only minor difficulties.  My
soldering job isn't the cleanest in the world but the rig works as
spec'd.  However, with that said, I could see my soldering improving
as I progressed from stage to stage.  My biggest problem is feeding
too much solder into the joint.  I think I need to switch to a smaller
diameter solder.

I'd like to procure an XV50 around the first week of October.
However, this will be cutting it close time wise for it's intended
purpose; the 50MHz Sprint on October 20th.  However, this shouldn't be
much of a problem as I am currently disabled and have more time than I
know what to do with lately.

Thanks for any feedback.

-- 
JT Croteau, N1ESE - Manchester, NH
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[Elecraft] XV50

[Mike Harris]

Good day,

Just been finishing off the alignment of an XV50.

L15 has a sharp peak.

L16 is flat, very little effect from adjusting the core.

L17 is flat as advised in the tuning instructions.

I can't see why L16 should be flat tuning.  Before I start digging too 
deep can anyone confirm the tuning response of L16.

If I had known about the K3 earlier I wouldn't have bought the XV50 which 
in some respects has been the least pleasant build to date.  It does, 
nevertheless seem to work OK though.  I see a 50dB increase in af when 
connecting the noise generator and the noise level increases when I 
connect the 6M 5-el Yagi.

Regards,

Mike VP8NO 

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[Elecraft] XV50 transverter update

[James C. Hall, MD]

Hello Don and Ron:

 

I got my new power module in the mail today and it went right in without a
hitch. Alignment at that point went very smooth. I used a DL-1 to measure
voltage and then chart it out to 20 watts. My LP-100 is waiting to be built.
:-) I figured 22 volts was about 20 watts and that worked great. All the
other parts of the alignment went fine except:

 

Part IX: Overload Protection test - I couldn't get this to work. Removing
the jumper JP8 removes power from the transverter. This can be turned on
manually with the power switch, but I left it off as the instructions said
nothing about it. Removing the serial control cable, disables the
transverter entirely - no power with or without the front switch on. Keying
the transmitter resulted in nothing except a higher SWR light on the KAT100.

 

LO Oscillator Frequency Calibration: Using my Mark V on 12M, I find I'm off
on 6M by about 700 Hz. But where the heck is Z6 trimmer capacitor. I suspect
it should be C64, since I haven't touched that one yet. :-)

 

73, Jamie

WB4YDL

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[Elecraft] XV50 Transverter Help

[James C. Hall, MD]

Hello:

 

I'm in the process of aligning my transverter and I'm stuck on the RF PA
quiescent current adjustment, where R39 is adjusted to 20 mV when keying the
transverter. Before keying, I get 7 mV; after keying, no matter what
position R39 is in, I get only 12 mV. 

 

There is no troubleshooting section in the manual. Could someone point me in
the right direction ?

 

Thanks and 73, 

 

Jamie  WB4YDL 

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RE: [Elecraft] XV50 Transverter Help

[Don Wilhelm]

Jamie,

If you are dealing with an XV50, you should not have an R39 installed. There
is no quiescent Current Adjustment for the XV50 - see the statement right
under the 'Part V - ...' title.

73,
Don W3FPR

 -Original Message-
 From: [EMAIL PROTECTED]
 [mailto:[EMAIL PROTECTED] Behalf Of James C. Hall, MD
 Sent: Sunday, March 04, 2007 6:57 PM
 To: Elecraft@mailman.qth.net
 Subject: [Elecraft] XV50 Transverter Help


 Hello:



 I'm in the process of aligning my transverter and I'm stuck on the RF PA
 quiescent current adjustment, where R39 is adjusted to 20 mV when
 keying the
 transverter. Before keying, I get 7 mV; after keying, no matter what
 position R39 is in, I get only 12 mV.



 There is no troubleshooting section in the manual. Could someone
 point me in
 the right direction ?



 Thanks and 73,



 Jamie  WB4YDL

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RE: [Elecraft] XV50 Transverter Help

[Ron D'Eau Claire]

Hi, Jamie:

First, troubleshooting, voltage tables, etc., are in the Owner's Manual.
Their location is called out in the assembly manual on page 53: Final Test
and Alignment, in case you run into a problem like this. 

Be sure you incorporated Errata C-4 into the Owner's Manual. It includes an
updated schematic diagram for the XV50 that shows R39 and new voltage tables
for troubleshooting. 

My first guess would be that you left jumper W1 out. That would open the
bias circuit to the RF power amplifier module. It should have been installed
as the second step on page 39 (in the assembly manual) of the building
procedure. 

Ron AC7AC



-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of James C. Hall, MD
Sent: Sunday, March 04, 2007 3:57 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] XV50 Transverter Help


Hello:

 

I'm in the process of aligning my transverter and I'm stuck on the RF PA
quiescent current adjustment, where R39 is adjusted to 20 mV when keying the
transverter. Before keying, I get 7 mV; after keying, no matter what
position R39 is in, I get only 12 mV. 

 

There is no troubleshooting section in the manual. Could someone point me in
the right direction ?

 

Thanks and 73, 

 

Jamie  WB4YDL 

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FW: [Elecraft] XV50 Transverter Help

[Don Wilhelm]

Sorry guys, I was looking at an old book and did not realize it - ignore my
last post.
Saved this time by Ron - thank you.

73,
Don W3FPR

-Original Message-

Oops.. I think you're using an old book, Don!

They had to change the XV50 design because the old module was no longer
available. The new module has the quiescent current adjustment. Errata C-4
to the Owner's manual has the updated schematic, voltage chart, etc. The
current Assembly Manual (Rev C) was updated in January to incorporate all
the build changes needed for the new module.

Ron AC7AC

-Original Message-

Jamie,

If you are dealing with an XV50, you should not have an R39 installed. There
is no quiescent Current Adjustment for the XV50 - see the statement right
under the 'Part V - ...' title.

73,
Don W3FPR


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Re: [Elecraft] XV50 problem... I think I'm closer to the problem

[Jean-François Ménard]

Worst than that I just connect my wideband NGen... I'm using my  
rf probe too


Now,

NGen OFF
Read at antenna jack 0.0 vrms

Ngen ON
Read at antenna jack = 0.5 vrms (ajusted my ngen to give me that result)
Read immediately at C28 on antenna jack side = 0.5 vrms also

» Read at C28 on C1 side = 0.0 vrms !!

Am I on the good track ?!?!?!?

Further reading give me also 0 at C3 and C48



Le 07-01-12 à 17:15, Matt Osborn a écrit :


On Fri, 12 Jan 2007 14:47:05 -0500, Jean-François Ménard
[EMAIL PROTECTED] wrote:


If someone could just give the actual Vdc of BOTH side of C3 (located
in RF section near U1) in RX state, it would be greatly  
appreciated !!!



XV50 -  No antenna (no signal) using Fluke DMM:

L2 side of C3 measures 4.2VDC; C48 side measures 0VDC

With N-gen at antenna using RF Probe:

N-Gen off:

L2 side of C3 measures ~1.0mv, C48 side measures ~1.0mv

N-gen on:

L2 side of C3 measures ~16mv C48 side measure ~16mv.

I measured the C48 side at both C3 and at C48 to see what drop there
might be across K2 relay contacts. There was minimal difference; less
than  0.1mv;




===

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard




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Re: [Elecraft] XV50 problem... problem solved !!

[Jean-François Ménard]

First of all, thanks to everyone who help me out !!!

Problem solved !!

Finally, I changed Q3 and C28 and everything is now working A

Best 73

J-F VA2VYZ

Le 07-01-13 à 11:30, Jean-François Ménard a écrit :

Worst than that I just connect my wideband NGen... I'm using my  
rf probe too


Now,

NGen OFF
Read at antenna jack 0.0 vrms

Ngen ON
Read at antenna jack = 0.5 vrms (ajusted my ngen to give me that  
result)

Read immediately at C28 on antenna jack side = 0.5 vrms also

» Read at C28 on C1 side = 0.0 vrms !!

Am I on the good track ?!?!?!?

Further reading give me also 0 at C3 and C48



Le 07-01-12 à 17:15, Matt Osborn a écrit :


On Fri, 12 Jan 2007 14:47:05 -0500, Jean-François Ménard
[EMAIL PROTECTED] wrote:

If someone could just give the actual Vdc of BOTH side of C3  
(located
in RF section near U1) in RX state, it would be greatly  
appreciated !!!



XV50 -  No antenna (no signal) using Fluke DMM:

L2 side of C3 measures 4.2VDC; C48 side measures 0VDC

With N-gen at antenna using RF Probe:

N-Gen off:

L2 side of C3 measures ~1.0mv, C48 side measures ~1.0mv

N-gen on:

L2 side of C3 measures ~16mv C48 side measure ~16mv.

I measured the C48 side at both C3 and at C48 to see what drop there
might be across K2 relay contacts. There was minimal difference; less
than  0.1mv;




===

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard




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===

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard




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Re: [Elecraft] XV50 problem is worst ! Need help.

[Jean-François Ménard]

Hi,

I verified all voltages in the troubleshooting section... both RX and  
TX.


I have a few readings that are not as the manual.

In RX, U7 (RF power module) PIN 1, I have 7.3 and should be to 0 !!!  
All other pins are OK.


In TX, U5, the leg on the same side of C9 is 5V and the leg on the  
side of C65 drop to 2.7V (should be around 4.7 ???)


All other measurements in the troubleshooting section are in the spec  
range.


So, If I consider that my problem is in RX. Is these results  
could help ???



Le 07-01-11 à 20:45, Jean-François Ménard a écrit :


Hi to all,

Last week, my transverter XV50 was unable to receive properly...  
Only a small voice in the background... no S unit... the guy  
normally give me 10 or 20 over S9...  After a new alignment  
procedure, I was unable to peak R13 to the desired level. I was  
unable to get more than 0.043 V. So my conclusion was that Q3 is dead.


I received a new Q3 transistor. Now it is installed. I did another  
alignement. Now with Q3, I can peak R13 very easy to the target of  
250mV. Note that before and now, my TX is still perfect. So no  
trouble with TX.


But even after Q3 changed it is worst. I do not receive  
anything at all... not even a small voice in the background.


If I listen to the background noise with or without antenna, it  
is the same. On the receiver input aligment, my noise generator did  
not make any difference ON or OFF.


So I really don't know where to start now. I don't have very much  
experience in finding trouble.


If someone could coach me where to start, I will really  
appreciate... :-((


Thanks for your times.

===

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard




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===

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard




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Re: [Elecraft] XV50 problem is worst ! Need help.

[Jean-François Ménard]

Question: If I have 7.2Vdc on U7 pin 1 on RX... is it possible that a  
problem with relay K1 ??? Because on RX, relay K1 should be in  
another position as I can figure it out on the schematic !?!?!?!?



Le 07-01-12 à 10:05, Jean-François Ménard a écrit :


Hi,

I verified all voltages in the troubleshooting section... both RX  
and TX.


I have a few readings that are not as the manual.

In RX, U7 (RF power module) PIN 1, I have 7.3 and should be to  
0 !!! All other pins are OK.


In TX, U5, the leg on the same side of C9 is 5V and the leg on the  
side of C65 drop to 2.7V (should be around 4.7 ???)


All other measurements in the troubleshooting section are in the  
spec range.


So, If I consider that my problem is in RX. Is these results  
could help ???



Le 07-01-11 à 20:45, Jean-François Ménard a écrit :


Hi to all,

Last week, my transverter XV50 was unable to receive properly...  
Only a small voice in the background... no S unit... the guy  
normally give me 10 or 20 over S9...  After a new alignment  
procedure, I was unable to peak R13 to the desired level. I was  
unable to get more than 0.043 V. So my conclusion was that Q3 is  
dead.




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