Re: [Elecraft] KDSP2's Primary Menu - K2 s/n 549

[Lyle Johnson]

What does E13.1 mean?  Where can I get a listing of the error codes?

The AFIL seems to work fine.  Help.


Not an error code.  13.1 is the supply voltage and 0.40 is the current.

However, you should get that on the second tap and the DSP information
on the first tap.  A third tap should return you to the frequency 
display.


This tends to indicate that the K2 doesn't think the KDSP2 is installed. 
 Since you did a complete firmware update, be sure you drill down to 
the K2's real time clock menu item and turn it on.



73,

Lyle KK7P



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Re: [Elecraft] KDSP2's Primary Menu - K2 s/n 549

[Bob Nielsen]

On Wed, Nov 17, 2004 at 09:47:01PM -0600, Bill Scurlock wrote:
> When I tap the DISPLAY button on my K2 to access the KDSP2's primary menu I
> get an error message:  E13.1 0.40.  The last time I used the KDSP2, about a
> month ago, this menu access worked correctly.  The only thing different
> since then is that I removed the K2/100 top unit, and reinstalled the
> original top unit with the antenna tuner.  Also, I installed the new 2.04 K2
> firmware and the 1.09 I/O controller firmware.
> 
> What does E13.1 mean?  Where can I get a listing of the error codes?
> 
> The AFIL seems to work fine.  Help.
> 

Not an error code.  13.1 is the supply voltage and 0.40 is the current.

However, you should get that on the second tap and the DSP information
on the first tap.  A third tap should return you to the frequency 
display.

Bob, N7XY
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[Elecraft] KDSP2's Primary Menu - K2 s/n 549

[Bill Scurlock]

When I tap the DISPLAY button on my K2 to access the KDSP2's primary menu I
get an error message:  E13.1 0.40.  The last time I used the KDSP2, about a
month ago, this menu access worked correctly.  The only thing different
since then is that I removed the K2/100 top unit, and reinstalled the
original top unit with the antenna tuner.  Also, I installed the new 2.04 K2
firmware and the 1.09 I/O controller firmware.

What does E13.1 mean?  Where can I get a listing of the error codes?

The AFIL seems to work fine.  Help.

Bill, K5GCW


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Re: [Elecraft] soldering iron story

[Nigel]

Snip
>Picked up the matching desoldering attachment that replaces the TCP element

>tube at a junk sale. The rubber bulb has now finally perished with age.
 
>Anybody know of a source of replacements for these rubber bulbs?

www.farnellinone.co.nz

Have them listed as parts No 419-096 at NZ$19.72

Regards

73s,  Nigel ZL2DF

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Re: [Elecraft] KPA100 C83

[John, KI6WX]

Brian;
When we built the original KPA100 prototypes, the optimum value of this
capacitor was not known.  If you make it larger, the amp draws more current
on 10 meters but is more stable.  With smaller values, you get better
efficiency on 10 meters but it is more prone to spurious oscillations.  It
is a lot easier to remove the capacitor when it is soldered directly to the
pads, so the instructions were changed to solder it to the pads.

The original prototypes and earlier production KPA100's used 1200pF.
Experiments showed that the value could be reduced without problems.  My
KPA100 has run for a long time with the value at 820pF.  It was eventually
decided that 1000pF was reasonable, so the production kits were changed to
this value and updates sent out to the earlier KPA100 builders.  Today, the
part could be mounted in the holes without any problems.
-John
 KI6WX

- Original Message - 
From: "Brian Wruble" <[EMAIL PROTECTED]>


> Hi guys:  While assembling my KPA100, I unfortunately charged right by the
> warning not to install C83 through the holes in the board.  I removed the
> 1000ufd cap and reinstalled it as recommended.  However, I am very curious
> as to why it is specified to be mounted this way.  I have reviewed prior
> postings here, and found this question, but never saw any answers.
>
> Tnx de Brian W3BW


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Re: [Elecraft] Low voltage on AGC threshold

[Mike, W8ENG]

John,   My DMM is a $30 Radio Shack unit.  I do not have anything handy to
calibrate or check the accuracy.  It does report DC voiltage to 2 decimal
points, but I doubt that it is that accurate.  Any way, for now I'm
proceeding with construction.

Mike, W8ENG


- Original Message -
From: "John R. Lonigro" <[EMAIL PROTECTED]>
To: "Mike, W8ENG" <[EMAIL PROTECTED]>
Cc: 
Sent: Tuesday, November 16, 2004 10:29 PM
Subject: Re: [Elecraft] Low voltage on AGC threshold


> Mike:
>
> How accurate is your DMM?  The 8v and 5v regulators should still produce
> 8 and 5 volts even with a slightly low supply voltage.  Also, if the
> K2's internal voltmeter reads the same as your DMM, that tells me your
> DMM is reading low because there is a diode in the K2 power line which
> will make the K2 internal voltmeter read LESS than an accurate external
> DMM.  Only if the external DMM reads low would the two voltmeters agree.
>
> Try to check your voltages with a different DMM.  My guess is your
> problem is NOT low voltage all around.  Good luck.
>
> 73's
>
> John AA0VE
>
> Mike, W8ENG wrote:
>
> >This is an update to my earlier post.  I touched up a solder joint and
> >reassembled the radio.  The voltage on pin 5 of U2 was still 3.78 volts,
> >with the RF gain set fully clockwise.  The input voltage from my power
> >supply was 12.4 volts, both on my DMM and on the K2's internal voltmeter.
> >The voltage out on the 8v regulator was 7.8,a nd on the 5v regulator was
> >4.9.
> >
> >I'm thinking that the problem may be low voltage all around.  I don't
have a
> >better power supply to check with at a higher voltage.
> >
> >Any addational help or comments would be appreciated.
> >
> >73,  Mike, W8ENG
> >
> >
>

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Re: [Elecraft] Circuit Simulation Software

[Larry Phipps]

LTSpice is a freeware Spice program from Linear Technology that is quite 
good and easy to use... and the price is right.


Larry N8LP



Howard W. Ashcraft wrote:


I am looking for software (preferably Linux, open source) to model electronic 
circuitry.  My primary interest is educational.  I want to use the software to 
design and investigate circuits to better understand how they work.  I may do a 
little design, as well.  Does anyone have suggestions?

HOWARD W. ASHCRAFT, Jr.
Direct Dial: (415) 995-5073
[EMAIL PROTECTED] 
HANSON 		333 Market Street, 23rd Floor

BRIDGETTSan Francisco, CA 94105-2173
MARCUS  Direct: (415) 995-5073
VLAHOS  Main: (415) 777-3200
RUDY, LLP		Fax: (415) 541-9366 


This communication, including any attachments, is confidential and is protected 
by privilege. If you are not the intended recipient, any use dissemination, 
distribution, or copying of this communication is strictly prohibited. If you 
have received this communication in error, please immediately notify the sender 
by telephone or e-mail, and permanently delete all copies, electronic or other, 
you may have. The foregoing applies even if this notice is embedded in a 
message that is forwarded or attached.


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Re: [Elecraft] Circuit Simulation Software

[Bob Tellefsen]

Howard
Look up RFSim99.  It's free and might do for starters.
73, Bob N6WG
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RE: [Elecraft] Internal AAA batteries for KX1?

[Steve]

How about reducing the depth of the stock KX1 cabinet to a minimum, such
that no batteries fit.  Then engineering a "piggy back" case to fit (snap,
plug, clip,...) on the back of the KX1 that truly seperates batteries from
the radio electronics?  This could be made an option, perhaps with AA or AAA
cells, or even some exotic Li Ion flat pack, or?...

This way you could use the "internal" batteries, or leave the battery
pack/case at home and use external power via connector.

Just my $0.02 worth...

Steve
aa8af




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RE: [Elecraft] K2 Noise Blanker Modifications

[Sverre Holm]

It works now, so I think it is just the usual qsl.net problems. This is why
I have mirrored my mods list on qslnet.de .
 
Try  
http://www.qslnet.de/la3za/K2/mod.html under General mods and KNB2.
 
 
73

Sverre
LA3ZA
http://www.qsl.net/la3za/
  


  _  

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: 17. november 2004 02:21
To: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Noise Blanker Modifications



Hi Sverre,
 
The link to VE3MCF for the mod to increase KNB2 time constant does not seem
to work anymore. Any other source of the mod details for suggested values
for C11/C12?
 
Regards,
Bob, G3VVT

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[Elecraft] Re: Alignment and Test, Part II

[Jerry]

>..
>With the VCO test I always measure 8v at R30.
>The voltmeter reading does not change at all i tune L30 or the VFO.
>
Peter,

Did you check the other bands or only 80 meters?  If not try the others.  I had 
the same problem on 80  and 40 meters and I cheched the rest  and they were 
below 8 volts.  I then adjusted L30  on the (i think 17 meters)  that was below 
8 volts and I could see the voltage change on R30.  I continued to adjust L30 
for a lower voltage on 17meters.  I switched back to 80/40 and finally it went 
below 8 volts.  
The voltage on R30 will stay at 8 volts until you reach a point and it will 
lower.   Just switch back and forth until you see it change.   

Good luck,
Jerry, N2UZ


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[Elecraft] Weller WTCPT magnetized tip

[Jeremiah McCarthy]

IMHO, it is unlikely that the tip has become magnetized...If that were 
possible, it would become magnetized by the magnet inside the heater that is 
the operational heart of this soldering station...I think it is more likely 
that the magnetic plunger, which activates the temperature switch, has become 
stuck, or that the return spring has broken...This can easily be checked by 
removing the tip while the iron is cold and pushing on the plunger up inside 
the heater with a small screw driver...It should easily move up about 1/2 inch 
and spring back down when the pressure is released...

Jerry, wa2dkg
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Re: [Elecraft] KPA100 C83

[W3FPR - Don Wilhelm]

Brian,

I am not certain, but I will venture a guess that C83 will handle more 
current when mounted with its leads bent over and soldered to the pads.  The 
other thing I can think of is that the leads present a smaller inductance 
when mounted that way.


73,
Don W3FPR

- Original Message - 


Hi guys:  While assembling my KPA100, I unfortunately charged right by the
warning not to install C83 through the holes in the board.  I removed the
1000ufd cap and reinstalled it as recommended.  However, I am very curious
as to why it is specified to be mounted this way.  I have reviewed prior
postings here, and found this question, but never saw any answers.





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Re: [Elecraft] Circuit Simulation Software

[Hisashi T Fujinaka]

On Wed, 17 Nov 2004, Howard W. Ashcraft wrote:


I am looking for software (preferably Linux, open source) to model
electronic circuitry.  My primary interest is educational.  I want to
use the software to design and investigate circuits to better
understand how they work.  I may do a little design, as well.  Does
anyone have suggestions?


Heh. I use SPICE, and I'm sure by now that there's a nice front-end for
the thing. It's old and crusty and ran on IBMs when I first started
using it. Used it to model CMOS timing the last time I had an EE job.

For a lot leetnix software, you can check freshmeat.net, part of the
OSTG (Open Source Technology Group?) like slashdot.org, etc.

--
Hisashi T Fujinaka - [EMAIL PROTECTED]
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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Re: [Elecraft] Circuit Simulation Software

[Bob - W5BIG]

Hi Howard,

A very good circuit simulation program is Top Spice which you can get at:
http://www.penzar.com/

The free demo version (no time limit) is quite useful.  I use it all the
time.
The program is user friendly and the online help that comes with it is good.
There are a lot of circuit models with it and
you can get more from various semiconductor manufacturers.

73/ Bob - W5BIG


- Original Message -
From: "Howard W. Ashcraft" <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, November 17, 2004 11:44 AM
Subject: [Elecraft] Circuit Simulation Software


I am looking for software (preferably Linux, open source) to model
electronic circuitry.  My primary interest is educational.  I want to use
the software to design and investigate circuits to better understand how
they work.  I may do a little design, as well.  Does anyone have
suggestions?

HOWARD W. ASHCRAFT, Jr.
Direct Dial: (415) 995-5073



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Re: [Elecraft] Circuit Simulation Software

[Pierre Desjardins]

There was a review in QST, June 2004 of CircuitMaker Student Version...
WinXp version though..

http://www.circuitmaker.com/downloads/student.htm

73 de Pierre VE2PID

- Original Message - 
From: "Howard W. Ashcraft" <[EMAIL PROTECTED]>

To: 
Sent: Wednesday, November 17, 2004 12:44 PM
Subject: [Elecraft] Circuit Simulation Software


I am looking for software (preferably Linux, open source) to model 
electronic circuitry.  My primary interest is educational.  I want to use 
the software to design and investigate circuits to better understand how 
they work.  I may do a little design, as well.  Does anyone have 
suggestions?


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Re: [Elecraft] Alignment and Test, Part II

[HB9DUT]

Hi,
ok i think builder alert #12 describes exactly my problem with the 
frequency counter.


I have ordered a pair of new MPS5179's for replacement of Q9 & Q10.
As soon as the parts arrive I will again report

73 de Peter - HB9DUT
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[Elecraft] Circuit Simulation Software

[Howard W. Ashcraft]

I am looking for software (preferably Linux, open source) to model electronic 
circuitry.  My primary interest is educational.  I want to use the software to 
design and investigate circuits to better understand how they work.  I may do a 
little design, as well.  Does anyone have suggestions?

HOWARD W. ASHCRAFT, Jr.
Direct Dial: (415) 995-5073
[EMAIL PROTECTED] 
HANSON  333 Market Street, 23rd Floor
BRIDGETTSan Francisco, CA 94105-2173
MARCUS  Direct: (415) 995-5073
VLAHOS  Main: (415) 777-3200
RUDY, LLP   Fax: (415) 541-9366 

This communication, including any attachments, is confidential and is protected 
by privilege. If you are not the intended recipient, any use dissemination, 
distribution, or copying of this communication is strictly prohibited. If you 
have received this communication in error, please immediately notify the sender 
by telephone or e-mail, and permanently delete all copies, electronic or other, 
you may have. The foregoing applies even if this notice is embedded in a 
message that is forwarded or attached.


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[Elecraft] KPA100 C83

[Brian Wruble]

Hi guys:  While assembling my KPA100, I unfortunately charged right by the
warning not to install C83 through the holes in the board.  I removed the
1000ufd cap and reinstalled it as recommended.  However, I am very curious
as to why it is specified to be mounted this way.  I have reviewed prior
postings here, and found this question, but never saw any answers.

Tnx de Brian W3BW


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[Elecraft] ARCBS 2004 Jingle Bell Romp Award - Sorry!

[Edward R. Breneiser]

Hello all,
 
I'm receiving emails stating that the link I provided is bad  and you're
correct.
The link ended up on two lines and therefore was truncated in the email.
Here's a good link to view the award.
 
http://www.arcbs.org  
 
Just click on the award link on the front page.
 
72/73,
Ed, WA3WSJ
ARCBS # 1
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Re:[elecraft] K160RX problem

[Bryan]

Hi Don

Thanks for that.

73 Bryan G3AKF
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Re: Re[Elecraft]K160RX problem

[W3FPR - Don Wilhelm]

Bryan,

This is a residual step left over from the old days when CAL PLL was to be 
performed on all bands - it is no longer required, CAL PLL is only done with 
the K2 set to 40 meters - and as you experienced it will report an error if 
you attempt it on 160.


Simply skip that step in the K160RX instructions and all will be well.

73,
Don W3FPR

- Original Message - 

Tryng to do 160 Meter Alignment page 9.  CALL PLL display shows 06917.1 and 
then Info 232.


Any ideas will be appreciated.



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Re: [Elecraft] Minimum clearance on KPA-100 heatsink?

[W3FPR - Don Wilhelm]

Tom,

Personally, I would not stack them - you can try it of course and monitor 
the temperature of the lower one carefully.  Send us a report if you try it.


73,
Don W3FPR

- Original Message - 

If I stack two K2/100's on top of each other using only the rubber feet for 
clearance would the lower K2 be at risk of overheating under contest level 
activity?




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Re: [Elecraft] Re: Alignment and Test, Part II

[W3FPR - Don Wilhelm]

Peter,

For your BFO problem.

Look at Q9 and Q10 (MPS5179) on the control board.  If they are colored 
blue, they may be weak - Elecraft will replace them with the black ones.  In 
the meantime, 2Ns may be substituted.  The signal level at TP2 is much 
lower than at TP3.  Your probe must work since you were able to measure the 
PLL/VCO frequencies at TP1 and TP3.


If I recall, you have a 'scope (if not, use an RF Probe) - you should see 
0.025 to 0.070 volts RMS at TP2 (K2 menu must be in CAL FCTR or no rf 
voltage will be seen).  On your 'scope this will be 70 mv to 197 mv peak to 
peak.


If you have OK RF voltage on TP2, all should be good, but if not, check the 
level at U11 pin 6, that should be 0.20 to 0.70 Vrms (0.56 to 1.98 Vp-p).


Since your external counter shows the correct BFO frequency, I suspect Q9 
and Q10 on the control board.


73,
Don W3FPR


- Original Message - 


The internal frequency counter work, i have calibrated on TP3 with an 
externel counter.
But on TP2 (BFO) i read only nonsens on the Display. My external counter 
reads the correct frequency at TP3.

Maybe the level at TP3 is low or i have a problem with the RF-Probe.




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Re[Elecraft]K160RX problem

[Bryan]

Hi All

Tryng to do 160 Meter Alignment page 9.  CALL PLL display shows 06917.1 and 
then Info 232.

Any ideas will be appreciated.

73 Bryan G3AKF
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Re: [Elecraft] Re: Alignment and Test, Part II

[G3VVT]

See Elecraft Builders Alert #21, October 19, 2004.
 
The frequency counter input transistors Q9, Q10, 2N5179 on the K2 Control  
board can be low gain if the blue faced type. This gives similar symptoms to  
what you have on the BFO TP2 which has a lower RF level than TP1 or TP3  
consequently can cause randow readings.
 
Was discussed a few days back.
 
Bob, G3VVT
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[Elecraft] Re: Alignment and Test, Part II

[HB9DUT]

Oh my god - shame on me :-)

I found the problem, i use the wrong core for the T5.
All was ok, the parts the windings on the core... but it was the wrong 
one

Now with the correct core the voltage at R30 can be adjusted with L30.
Thank you to all for the assistance.

But i have another question:

The internal frequency counter work, i have calibrated on TP3 with an 
externel counter.
But on TP2 (BFO) i read only nonsens on the Display. My external counter 
reads the correct frequency at TP3.

Maybe the level at TP3 is low or i have a problem with the RF-Probe.

73 de Peter

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[Elecraft] Minimum clearance on KPA-100 heatsink?

[Tom Althoff]

If I stack two K2/100's on top of each other using only the rubber feet for 
clearance would the lower K2 be at risk of overheating under contest level 
activity?

Tom K2TA
K2 #1117-C 
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Re: [Elecraft] Alignment and Test, Part II

[G3VVT]

Hi Peter,
 
The significant voltage could be the PLL chip PDOUT, U4 pin13.  Check for 
shorts on this pin that would give a zero reading. Not sure if the PLL  chip 
itself would support such a low voltage whilst working normally.  Have seen 
reported of odd effects with RFC15 the DC feed to the PLL  chip U4 pin16, so 
check 
for actual DC continuity with this component.
 
What you do not appear to state and this is very important, is the VCO  
oscillating or not?.
 
Checks with the K2 frequency counter at TP1 would at least help as an  
initial test. The frequency read depends on the band in use and reference to 
the  
table at the beginning of Appendix B gives the range of VCO frequencies to be  
expected. Tests with the RF probe/DMM at TP1 should give a reading  between 
600mV and 750mV according to the Elecraft trouble shooting guide.
 
Bob, G3VVT
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[Elecraft] Re:WTCPT Weller Soldering Stations

[alanchilds]

HMCelectronics on the web has a sale on the WTCPT Weller Soldering Stations 
at $109.00.  There is also a mail-in rebate of $20.00 through 28 Feb 05. 
That brings the price down to $89.00 plus shipping.  Web site is 
www.hmcelectronics.com


Alan B. Childs, K6IPM 


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Re: [Elecraft] soldering iron story

[G. Beat]

> Picked up the matching desoldering attachment that replaces the TCP element  
> tube at a junk sale. The rubber bulb has now finally perished with age.
>
> Anybody know of a source of replacements for these rubber bulbs?
> 
> Checks with dealers at later junk sales have drawn a blank apart  from 
> thoughts they may have been used by the military in the UK.
>  
> Bob, G3VVT
>

Bob -

Yes,  TriState Electronics, Mt. Prospect, IL had a black replacement Weller 
bulb in stock, 
when I was in there last week.  Weller made these bulbs in Red and black rubber.

You can sometimes find these at the drug stores.

Greg
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Re: [Elecraft] Alignment and Test, Part II

[HB9DUT]

Hello Jim,

yes i have a O'scope.
I mesured the following Signals:

U4 Pin 4:   1.2Vpp sine form
U3 Pin 3:   0.8Vpp sine form
U3 Pin 6:   1.6Vpp sine form

is this ok?

73 de Peter

k4zm schrieb:


Peter:

Do you have an O'scope?  It appears that you have no input to Pin 4 if 
U4 which is the output of the VFO that mixes in the Synthesizer.  With 
a scope you could trace back to see where the signal stops.  Look at 
Pin 6 of U3 and Pin 3 of U3. The synthesizer is not in a locked 
condition so that means that the chip is not getting one of the 
required signals.  Since the Ref Osc is ok and has the proper range I 
thing the problem lies in the VFO or Buffer circuit or maybe even the 
VFO ALC circuit.


73
Jim Younce K4ZM
K2  SN:18


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[Elecraft] KX1 Brag

[John Chappell]

KX1 #904 has been working great for my stay in VP9.
The weather hasn’t lived up to expectations and the bands suffered badly
from the disturbance last week.
Highlight so far was working 5 JA’s lp on 30m between 2115 and 2130
yesterday.
Been using a sloping dipole with the top end at 30 feet.
Now have only one full day left on the island
But what a great rig to put in your bag.

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RE: [Elecraft] KIO2 outside of K2

[Steven Pituch]

Jack said:

>Steve;

>What is it you are trying to do?

>> I noticed that the KIO2 option uses a standard conversion chip like 
>> the Maxim 232, but does not use optoisolators.

Hi Jack,
With my limited knowledge from scratch building an rs232 interface, I
thought it might be better for the interface in the K2 to be outside the rig
for isolation purposes.  I thought the farther away it was from the xcvr the
better things might be.  However, you have shown me that I was talking about
a different type of problem with regard to the optoisolators.  My plans are:
1)to update my K2 #402, 2)add a KIO2, 3)do some digital QSOs with CAT
control, 4)eventually add the KPA100 inside the K2 enclosure, and eventually
5)remote the KPA100 and a KA100 in an EC2 enclosure.

Which brings up another question.  Is the remote KPA100 option approved by
Elecraft?  I see that people have done this, but I haven't found any actual
Elecraft documentation on it.

Steve, W2MY

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Re: [Elecraft] Internal AAA batteries for KX1?

[Tim O'Rourke]

FWIW 
I use Lithium Ion batteries in RC planes and I also use them with the KX1, K1 
and other rigs. However I do not use them in the rig, I have seen too many 
battery failures over the years (30) to trust charging in the rig. I do have 
several 3 cell (11.5) volt flat cell packs I use as external source. I like 
this as I can change packs on the fly and charge them away from rig. As an 
example a 3 cell flat pack with a rating of 3500 mah is about the size of an 8 
cell AA flat pack but thinner and about 1/3 of the weight. They do require a 
charger that is made specifically for Lithium Ion packs. I carry 2 of these in 
back pack and get many hours of op time before needing recharged. 
Tim W4YN

From: "Eric Ward" <[EMAIL PROTECTED]>
I have a rechargeable lithium CR-V3 battery for my digital camera-it is 3V
nominal, and the same size as 2 AAs smushed together side-by-side.  The 3+3
cell arrangement in the KX1 precludes using these, but I wonder if someone
is going to come out with a rechargeable lithium AA-or do they already
exist?

Eric

N0HHS 

KX1 #670

I saw a posting yesterday on QRP-L where someone saw AAA Lithium batteries
for sale so I went to the Energizer.com site and sure enough it looks like
Eveready is now manufacturing a 1250 mah AAA Lithium cell.

This got me to thinking about how great it would be if Elecraft offered
an alternative bottom cover for the KX1 that had 2 X 4 AAA holders giving
12+ V instead of 10V with the 2 X 3 AAs.

 

Tim O'Rourke 
[EMAIL PROTECTED]
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Re: [Elecraft] Low voltage on AGC threshold

[Geoffrey Mackenzie-Kennedy]

Mike ,
Typing error in my post, last line. Low voltage should be 2.600  not
2.667 - same as you get.  Sorry.
73,
Geoff   GM4ESD


- Original Message - 
From: "Geoffrey Mackenzie-Kennedy" <[EMAIL PROTECTED]>
To: "Mike, W8ENG" <[EMAIL PROTECTED]>
Cc: "Elecraft Discussion List" 
Sent: Wednesday, November 17, 2004 10:53 AM
Subject: Re: [Elecraft] Low voltage on AGC threshold


> Mike,
>
> There is a design problem in this circuit, IMHO, which has to do with
> tolerances, and I am having an off list discussion about it. Nothing
> serious, and I am sure that it can be fixed easily. I'm letting you know
so
> that you don't damage anything by too much poking around in K2. The 3.78
> volts that you read at U2 pin 5 is 0.053 volts higher, I figure, than you
> should get with the 7.8 volts from the 8v regulator, if the RP6 resistors
> are 5100 ohms +- zero!! Three terminal voltage regulators also have
> tolerance specs on voltage output as measured at the regulator output
> terminal, so 8.000 volts is not a sacred cow.
>
> I had exactly the same sort of problems, slightly different voltages. But
K2
> was VERY useable with AGC on, but not quite up to full sensitivity being a
> little bit "AGC limited".
>
> 73, GeoffGM4ESD
>
> PS : The low voltage that you get is 2.6 volts  -  I figure that you
should
> get 2.667 volts - nit pickey fussy eh?
>
>
>
> - Original Message - 
> From: "Mike, W8ENG" <[EMAIL PROTECTED]>
> To: 
> Sent: Wednesday, November 17, 2004 12:44 AM
> Subject: Re: [Elecraft] Low voltage on AGC threshold
>
>
> > This is an update to my earlier post.  I touched up a solder joint and
> > reassembled the radio.  The voltage on pin 5 of U2 was still 3.78 volts,
> > with the RF gain set fully clockwise.  The input voltage from my pow

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Re: [Elecraft] Low voltage on AGC threshold

[Geoffrey Mackenzie-Kennedy]

Mike,

There is a design problem in this circuit, IMHO, which has to do with
tolerances, and I am having an off list discussion about it. Nothing
serious, and I am sure that it can be fixed easily. I'm letting you know so
that you don't damage anything by too much poking around in K2. The 3.78
volts that you read at U2 pin 5 is 0.053 volts higher, I figure, than you
should get with the 7.8 volts from the 8v regulator, if the RP6 resistors
are 5100 ohms +- zero!! Three terminal voltage regulators also have
tolerance specs on voltage output as measured at the regulator output
terminal, so 8.000 volts is not a sacred cow.

I had exactly the same sort of problems, slightly different voltages. But K2
was VERY useable with AGC on, but not quite up to full sensitivity being a
little bit "AGC limited".

73, GeoffGM4ESD

PS : The low voltage that you get is 2.6 volts  -  I figure that you should
get 2.667 volts - nit pickey fussy eh?



- Original Message - 
From: "Mike, W8ENG" <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, November 17, 2004 12:44 AM
Subject: Re: [Elecraft] Low voltage on AGC threshold


> This is an update to my earlier post.  I touched up a solder joint and
> reassembled the radio.  The voltage on pin 5 of U2 was still 3.78 volts,
> with the RF gain set fully clockwise.  The input voltage from my power
> supply was 12.4 volts, both on my DMM and on the K2's internal voltmeter.
> The voltage out on the 8v regulator was 7.8,a nd on the 5v regulator was
> 4.9.
>
> I'm thinking that the problem may be low voltage all around.  I don't have
a
> better power supply to check with at a higher voltage.
>
> Any addational help or comments would be appreciated.
>
> 73,  Mike, W8ENG
>

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Re: [Elecraft] Alignment and Test, Part II

[HB9DUT]

Hi,

thank's for all the good pieces of advice. Unfortunately up to now 
without success...

I accomplished the following steps:

- checking all parts of  correctness and correct value: -> ok
- checking each solder point: -> ok
- checking solder points of T5 and the thermistor board with an DMM -> ok

i have also checked all DC voltages from the IC's in the PLL section:

Ref.Pin  VDC  my K2

U3  6 4.3 4.2
  7 8.0 8.0
  8 0.0 0.0

U4  1 2.1 2.1
  2 2.4 2.3
  3 0.0 0.0
  4 2.3 2.3
  5 5.0 5.0
  6 5.0 5.0
  7 0.0 5.0  **
  8 0.1 0.6  **
  9 0.0 0.0
10 0.0 0.0
11 0.0 0.0
12 0.0 0.0
13 4.0 0.0  **
14 5.0 5.0
15 5.0 5.0
16 5.0 5.0

U5  1 0.0 5.0 **
  2 5.0 0.0 **
  3 5.0 5.0
  4 5.0 5.0
  5 0.0 0.0
  6 2.0 2.0
  7 0-4 4.0
  8 5.0 5.0

U6  1 0-8 8.0
  2 0-4 4.0
  3 0-4 4.0
  4 0.0 0.0
  5 4.0 4.0
  6 4.0 0.0  **
  7 0-8 8.0
  8 8.0 8.0

** this values are outside of the specification

The 12 MHz Reference Oscillator is working with an range of  12.3 kHz.

Does someone have still further tips where I to search could?

73 de Peter



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