Re: [Elecraft] K2 VCO Alignment Issue

[John Wingard]

Hi Dave,

Don and I have had several exchanges off list, so let me bring you up to
speed. In addition to the low VFO frequencies, I had noticed some
instability in the frequencies as displayed. Don suggested that I insert a
10-15pf cap between the source of the Q19 FET and ground. I did that late
last night and not only did that clear up the frequency instability, but
now my VFO frequencies are up about where they are supposed to be (8912 at
4000 and 12013 at 7100). I don't know if adding the cap did all of that or
perhaps the process of reflowing the connection on the source pad of the
FET straightened things out. So now I'm back to the original problem of the
8.37 V at R30 which has not changed. Don also wanted me to order two J310
FET from Elecraft, but in light of this latest finding I was waiting to see
if he still wanted me to do that.

73 de John WB4GLJ

On Wed, May 1, 2019 at 9:03 AM Dave Van Wallaghen  wrote:

> Hi John,
>
> I just got back in town and I know I'm late into this. I see Don is
> stepping you through some things as well. Here are a couple of things I
> was
> thinking:
>
> Since you have a VFO output although low in frequency,  I think because
> the
> voltage at pin 7 of U6 is so high it is driving the VFO circuit low in
> frequency. 8.37v seems to me to be the 8v rail in that circuit and since
> you can't really move that voltage on U6 P7, I might suspect a short
> between U6 P7 and P8 or at least a short between U6 P7 and the 8v rail.
>
> Just something else to look at...
>
> BTW - Don or I would be the guy to reply from support if you asked
> something there. So I just replied to the list so we can keep everything
> in
> a single thread.
>
> 73,
> Dave, W8FGU
>
> On April 30, 2019 15:49:42 John Wingard  wrote:
>
> > Hi Don,
> >
> > No problem on the delay. OK, after removing 1 turn from T5, the freq. at
> > TP1 (at 4000) is now 8535.14, so it did come up from the previous value,
> > but clearly not enough. I have 4.19 V on pin 5 of U6 and I have 4.21 V on
> > pin 13 of U4.
> >
> > I wasn't sure of your schedule so I also put in a support request to
> > Elecraft but have not received a reply as of yet. Hopefully between your
> > help and their help I can get this resolved.
> >
> > 73 de John, WB4GLJ
> >
> > On Tue, Apr 30, 2019 at 2:48 PM Don Wilhelm 
> wrote:
> >
> >> John,
> >>
> >> Where did the  TP1  frequency go after you removed a turn?
> >>
> >> It is possible that the VFO frequency is not getting back to U4 pin 4 --
> >> the signal goes from U3 pin 6 thru C62 and then to U4.
> >>
> >> Did we verify that U6 pin 5 is near 4 volts?  What is the voltage at U4
> >> pin 13?
> >>
> >> Sorry to go over things, but I just returned from a few days away and my
> >> memory is not yet focused.
> >>
> >> 73,,
> >> Don W3FPR
> >>
> >> On 4/28/2019 6:00 PM, John Wingard wrote:
> >> > Don,
> >> >
> >> > Finally got back to the K2 this afternoon. I have confirmed that T5 is
> >> > on the yellow core, with 16 turns through the center on the red and 4
> >> > turns on the green. I mentioned earlier that I got all the toroids
> >> > from the Toroid Guy, so I felt confident that it was correctly wound.
> >> > I checked all the relay pins on K13, K14, and K15 and did not see any
> >> > solder bridges on any of them. Next, I pulled T5 and removed one turn
> >> > and re-installed. Unfortunately, nothing has changed. I'm still
> >> > getting that same 8.37 V at R30. Incidentally, I'm getting the 8.37 V
> >> > on either side of R30. Is that normal? I can also pull T5 and wind a
> >> > new one with the parts that came with the kit if you think that might
> >> > help, but something tells me that the problem lies elsewhere. I also
> >> > thought about pulling C72 and replacing it with another one, but
> >> > unfortunately there was only one of that value in the kit and I don't
> >> > have anything like it it my parts stash. Any new thoughts?
> >> >
> >> > de John, WB4GLJ
> >> >
> >> >
> >> >
> >> > On Sat, Apr 27, 2019 at 6:00 PM Don Wilhelm  >> > <mailto:donw...@embarqmail.com>> wrote:
> >> >
> >> > John,
> >> >
> >> > Both frequencies are too low.
> >> > You have either too much capacitance or too much inductance in the
> >> > VFO.
> >> > Count the number of times the red wire goes through the center of

Re: [Elecraft] K2 VCO Alignment Issue

[John Wingard]

Hi Don,

No problem on the delay. OK, after removing 1 turn from T5, the freq. at
TP1 (at 4000) is now 8535.14, so it did come up from the previous value,
but clearly not enough. I have 4.19 V on pin 5 of U6 and I have 4.21 V on
pin 13 of U4.

I wasn't sure of your schedule so I also put in a support request to
Elecraft but have not received a reply as of yet. Hopefully between your
help and their help I can get this resolved.

73 de John, WB4GLJ

On Tue, Apr 30, 2019 at 2:48 PM Don Wilhelm  wrote:

> John,
>
> Where did the  TP1  frequency go after you removed a turn?
>
> It is possible that the VFO frequency is not getting back to U4 pin 4 --
> the signal goes from U3 pin 6 thru C62 and then to U4.
>
> Did we verify that U6 pin 5 is near 4 volts?  What is the voltage at U4
> pin 13?
>
> Sorry to go over things, but I just returned from a few days away and my
> memory is not yet focused.
>
> 73,,
> Don W3FPR
>
> On 4/28/2019 6:00 PM, John Wingard wrote:
> > Don,
> >
> > Finally got back to the K2 this afternoon. I have confirmed that T5 is
> > on the yellow core, with 16 turns through the center on the red and 4
> > turns on the green. I mentioned earlier that I got all the toroids
> > from the Toroid Guy, so I felt confident that it was correctly wound.
> > I checked all the relay pins on K13, K14, and K15 and did not see any
> > solder bridges on any of them. Next, I pulled T5 and removed one turn
> > and re-installed. Unfortunately, nothing has changed. I'm still
> > getting that same 8.37 V at R30. Incidentally, I'm getting the 8.37 V
> > on either side of R30. Is that normal? I can also pull T5 and wind a
> > new one with the parts that came with the kit if you think that might
> > help, but something tells me that the problem lies elsewhere. I also
> > thought about pulling C72 and replacing it with another one, but
> > unfortunately there was only one of that value in the kit and I don't
> > have anything like it it my parts stash. Any new thoughts?
> >
> > de John, WB4GLJ
> >
> >
> >
> > On Sat, Apr 27, 2019 at 6:00 PM Don Wilhelm  > <mailto:donw...@embarqmail.com>> wrote:
> >
> > John,
> >
> > Both frequencies are too low.
> > You have either too much capacitance or too much inductance in the
> > VFO.
> > Count the number of times the red wire goes through the center of
> > the T5
> > core - it should be 16.
> >
> > Check relays K13, K14 and K15 for solder bridges.
> >
> > Make sure the core of T5 is yellow.
> > You might have to try removing a turn from T5 if you can find no
> > other
> > cause - there have been a few K2s in the long past where the
> > permeability if the T5 core was higher than expected, and removing 1
> > turn from T5 corrected things - I have not seen that recently, but
> > I do
> > mention it 'just in case'.
> >
> > If all else fails, you may have to "wind your way" through the relay
> > connections for the VFO Range Select area using the Relay Table on
> > the
> > Schematic Key page as your guide for the paths through the relays.
> >
> > 73,
> > Don W3FPR
> >
> > On 4/27/2019 5:37 PM, John Wingard wrote:
> > > Hi Don,
> > >
> > > Thanks for the quick response. I did check C72 again. It is a 271
> > > value. I then spread the red turns on T5 as far as I could. I'd say
> > > they cover about 90+% of the toroid. I put the L30 slug at
> > mid-point
> > > of travel and measured voltage at R30 and it is still right at 8.37
> > > V.  While there I checked the frequency at TP1 and it was 8247.90,
> > > which is considerably lower than the 8913 that you expected.
> > >
> > > Next I went up to 7100 and measured the voltage at R30. Still
> > right at
> > > 8.37 V, no change. Frequency at TP1 @ 7100 was 11558.11.
> > >
> > > So, it appears that the frequency at 4000 is not within the
> > expected
> > > range, and likely not at 7100 as well. Hope this tells you
> > something
> > > because I'm stumped.
> > > I've got some plans for this evening so I may not get back on it
> > until
> > > tomorrow afternoon, but if you've got any more things for me to
> > try I
> > > will do them then.
> > >
> > > John, WB4GLJ
> > >
> > > On Sat, Apr 27, 2019 at 1:57 PM Don Wilhelm
> >  

Re: [Elecraft] K2 VCO Alignment Issue

[John Wingard]

Don,

Finally got back to the K2 this afternoon. I have confirmed that T5 is on
the yellow core, with 16 turns through the center on the red and 4 turns on
the green. I mentioned earlier that I got all the toroids from the Toroid
Guy, so I felt confident that it was correctly wound. I checked all the
relay pins on K13, K14, and K15 and did not see any solder bridges on any
of them. Next, I pulled T5 and removed one turn and re-installed.
Unfortunately, nothing has changed. I'm still getting that same 8.37 V at
R30. Incidentally, I'm getting the 8.37 V on either side of R30. Is that
normal? I can also pull T5 and wind a new one with the parts that came with
the kit if you think that might help, but something tells me that the
problem lies elsewhere. I also thought about pulling C72 and replacing it
with another one, but unfortunately there was only one of that value in the
kit and I don't have anything like it it my parts stash. Any new thoughts?

de John, WB4GLJ



On Sat, Apr 27, 2019 at 6:00 PM Don Wilhelm  wrote:

> John,
>
> Both frequencies are too low.
> You have either too much capacitance or too much inductance in the VFO.
> Count the number of times the red wire goes through the center of the T5
> core - it should be 16.
>
> Check relays K13, K14 and K15 for solder bridges.
>
> Make sure the core of T5 is yellow.
> You might have to try removing a turn from T5 if you can find no other
> cause - there have been a few K2s in the long past where the
> permeability if the T5 core was higher than expected, and removing 1
> turn from T5 corrected things - I have not seen that recently, but I do
> mention it 'just in case'.
>
> If all else fails, you may have to "wind your way" through the relay
> connections for the VFO Range Select area using the Relay Table on the
> Schematic Key page as your guide for the paths through the relays.
>
> 73,
> Don W3FPR
>
> On 4/27/2019 5:37 PM, John Wingard wrote:
> > Hi Don,
> >
> > Thanks for the quick response. I did check C72 again. It is a 271
> > value. I then spread the red turns on T5 as far as I could. I'd say
> > they cover about 90+% of the toroid. I put the L30 slug at mid-point
> > of travel and measured voltage at R30 and it is still right at 8.37
> > V.  While there I checked the frequency at TP1 and it was 8247.90,
> > which is considerably lower than the 8913 that you expected.
> >
> > Next I went up to 7100 and measured the voltage at R30. Still right at
> > 8.37 V, no change. Frequency at TP1 @ 7100 was 11558.11.
> >
> > So, it appears that the frequency at 4000 is not within the expected
> > range, and likely not at 7100 as well. Hope this tells you something
> > because I'm stumped.
> > I've got some plans for this evening so I may not get back on it until
> > tomorrow afternoon, but if you've got any more things for me to try I
> > will do them then.
> >
> > John, WB4GLJ
> >
> > On Sat, Apr 27, 2019 at 1:57 PM Don Wilhelm  > <mailto:donw...@embarqmail.com>> wrote:
> >
> > John,
> >
> > That high voltage is trying to reduce the capacity of the varactors.
> > Which means there is either too much capacity or too much
> > inductance in
> > the circuit.
> >
> > Check the value of C72 first - it should be marked "271". Then set
> > the
> > L30 slug to about mid-position and spread the red turns of T5
> > enough so
> > the starting and ending turns are adjacent.  What is the voltage when
> > tuned to 4000 kHz?  Measure the frequency at TP1 - it should be near
> > 8913 kHz.
> >
> > Then change to 40 meters - 7100 kHz - What is the R30 voltage and
> > what
> > is the VFO frequency measured at TP1.
> >
> > The answer to those questions will help in determining what to do
> > next.
> >
> > 73,
> > Don W3FPR
> >
> > On 4/27/2019 1:32 PM, John Wingard wrote:
> > > Working on my 2nd K2 (S/N 7869) and have run into a problem with
> > the VCO
> > > alignment. I'm getting a constant 8.37 V at R30  at 4.000 MHz..
> > I cannot
> > > change it with the full range of L30. Correct type inductor is
> > installed at
> > > L30.  Dropping the VFO down to 3.500 doesn't change it either. I
> > have gone
> > > back through the archives and read just about every post
> > concerning this
> > > problem but nothing I have tried has made any difference. I have
> > double
> > > checked all correct parts placements and orientations, re-flowed
> all
> >   

Re: [Elecraft] K2 VCO Alignment Issue

[John Wingard]

Hi Don,

Thanks for the quick response. I did check C72 again. It is a 271 value. I
then spread the red turns on T5 as far as I could. I'd say they cover about
90+% of the toroid. I put the L30 slug at mid-point of travel and measured
voltage at R30 and it is still right at 8.37 V.  While there I checked the
frequency at TP1 and it was 8247.90, which is considerably lower than the
8913 that you expected.

Next I went up to 7100 and measured the voltage at R30. Still right at 8.37
V, no change. Frequency at TP1 @ 7100 was 11558.11.

So, it appears that the frequency at 4000 is not within the expected range,
and likely not at 7100 as well. Hope this tells you something because I'm
stumped.
I've got some plans for this evening so I may not get back on it until
tomorrow afternoon, but if you've got any more things for me to try I will
do them then.

John, WB4GLJ

On Sat, Apr 27, 2019 at 1:57 PM Don Wilhelm  wrote:

> John,
>
> That high voltage is trying to reduce the capacity of the varactors.
> Which means there is either too much capacity or too much inductance in
> the circuit.
>
> Check the value of C72 first - it should be marked "271".  Then set the
> L30 slug to about mid-position and spread the red turns of T5 enough so
> the starting and ending turns are adjacent.  What is the voltage when
> tuned to 4000 kHz?  Measure the frequency at TP1 - it should be near
> 8913 kHz.
>
> Then change to 40 meters - 7100 kHz - What is the R30 voltage and what
> is the VFO frequency measured at TP1.
>
> The answer to those questions will help in determining what to do next.
>
> 73,
> Don W3FPR
>
> On 4/27/2019 1:32 PM, John Wingard wrote:
> > Working on my 2nd K2 (S/N 7869) and have run into a problem with the VCO
> > alignment. I'm getting a constant 8.37 V at R30  at 4.000 MHz.. I cannot
> > change it with the full range of L30. Correct type inductor is installed
> at
> > L30.  Dropping the VFO down to 3.500 doesn't change it either. I have
> gone
> > back through the archives and read just about every post concerning this
> > problem but nothing I have tried has made any difference. I have double
> > checked all correct parts placements and orientations, re-flowed all
> > connections in the quadrant of the board around the VCO section. T5 is
> > wound as per the manual (from the Toroid Guy) and installed correctly. I
> > have tried both spreading and compressing the turns on T5 with no change
> > either way.
> >
> > Regarding the thermistor board,  I have 4.18 V on pin 5 of U6.
> >
> > Test in the previous section were within specs:
> >
> > 4 MHz Oscillator Cal using CAL FCTR was 12099.61 and confirmed with an
> > external counter.
> > Range of the PLL reference oscillator: 12099.61 - 12086.01 = 13.59 kHz
> > VCO oscillator test: 8162.60 MHz
> >
> > I'm about out of ideas at this point. What should I start checking next?
> >
> > Thanks for any help!
> >
> > 73 de John, WB4GLJ
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft@mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
>
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[Elecraft] K2 VCO Alignment Issue

[John Wingard]

Working on my 2nd K2 (S/N 7869) and have run into a problem with the VCO
alignment. I'm getting a constant 8.37 V at R30  at 4.000 MHz.. I cannot
change it with the full range of L30. Correct type inductor is installed at
L30.  Dropping the VFO down to 3.500 doesn't change it either. I have gone
back through the archives and read just about every post concerning this
problem but nothing I have tried has made any difference. I have double
checked all correct parts placements and orientations, re-flowed all
connections in the quadrant of the board around the VCO section. T5 is
wound as per the manual (from the Toroid Guy) and installed correctly. I
have tried both spreading and compressing the turns on T5 with no change
either way.

Regarding the thermistor board,  I have 4.18 V on pin 5 of U6.

Test in the previous section were within specs:

4 MHz Oscillator Cal using CAL FCTR was 12099.61 and confirmed with an
external counter.
Range of the PLL reference oscillator: 12099.61 - 12086.01 = 13.59 kHz
VCO oscillator test: 8162.60 MHz

I'm about out of ideas at this point. What should I start checking next?

Thanks for any help!

73 de John, WB4GLJ
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[Elecraft] K2: Looking for two kits for the K2

[John Wingard]

I am looking for two kits for the K2...the K6XX zero-beat indicator kit for
the K2 and the Rework Eliminators internal mic adapter kit for the K2. If
anyone has either of these kits that are excess to their needs, please
contact me off list.

73, John WB4GLJ
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Re: [Elecraft] Amber display for the K2?

[John Wingard]

K2 S/N 1057 here and my display is a pale yellow-green color when lit.
Definitely not what I would consider to be amber.

73, WB4GLJ

On Wed, Apr 5, 2017 at 4:51 PM, Tom McCulloch  wrote:

> When it's off it's sort of grayish.  When I power the K2 up there are
> (what looks to be) two small light bulbs on, or behind, the left and right
> sides of the display,  When lit they give an amber-ish (if that's a word)
> color.  It's actually the color from the two "clear" incandescent bulbs.
>
> Does anyone with a low serial number have this and can better explain it?
>
> Tom, wb2qdg
> K2 s/n 1103
>
> On 4/4/2017 3:18 PM, Harry Yingst wrote:
>
>>
>>
>> How did you get the Amber display?
>>
>>
>>
>>
>> 
>> *From:* Tom McCulloch 
>> *To:* elecraft@mailman.qth.net
>> *Sent:* Tuesday, April 4, 2017 9:46 AM
>> *Subject:* Re: [Elecraft] Amber display for the K2?
>>
>> Amber here.s/n 1103
>>
>> Tom
>>
>> wb2qdg
>>
>>
>>
> --
>
> I don't wear a watch because where I am is where I want to be.
> I don't carry a cell phone because who I'm with is who I want to talk
> to...yep I'm retired!
>
> __
> Elecraft mailing list
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>
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> Message delivered to jwin1...@gmail.com
>
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Re: [Elecraft] W3FPR

[John Wingard]

I may be the only one that has done this, but over the past dozen years or so 
that I've been on this list, I have printed out many of Don's troubleshooting 
suggestions and solutions, punched them and put them in a 3-ring binder. I have 
two binders right now that are full, and have started on a third. They are 
almost like having a service manual when and if I ever need them. Don is 
definitely a treasure!


73 de WB4GLJ




 From: Phil Hystad phys...@mac.com
To: Phil Wheeler w...@socal.rr.com 
Cc: elecraft@mailman.qth.net 
Sent: Monday, February 9, 2015 12:06 PM
Subject: Re: [Elecraft] W3FPR
 

Another kudos report...

I have always been impressed by Don's comments and his wealth of knowledge and 
his absolute encyclopedia knowledge of not only the innards and design of the 
K2 but knowledge of most problems that happen to the K2 and their solutions.  
Now, I don't
have a K2 but every now and then I think of buying the K2 kit knowing that 
there is safety in having Don around to answer
questions that likely would arise.

73, phil, K7PEH


 On Feb 8, 2015, at 8:16 PM, Phil Wheeler w...@socal.rr.com wrote:
 
 Aside from the social skills Ted has lauded in Don, he's also one of the most 
 valuable fix-it resources for Elecraft transceiver owners. He's sure been a 
 help to me several times over the years (1999 to present) I've been working 
 on and with Elecraft gear.
 
 Kudos to Don :-)
 
 73, Phil W7OX
 
 On 2/8/15 7:57 PM, Dauer, Edward wrote:
 I want to acknowledge publicly someone who is one of the principal pillars
 of this reflector.  This may embarrass Don, whose modesty is utterly
 graceful, though my purpose is not to embarrass but to thank.
 
 This past weekend I was in 4-land visiting my son and his family.  Sonny
 surprised me by taking his Old Man to the Richmond (VA) Hamfest, a
 selfless filial act if there ever was one.  But there was the Elecraft
 booth; and manning it was Don, W3FPR.  When I saw his name/call tag I had
 to introduce myself.  What followed was a memorable, helpful, and
 altogether delightful eyeball QSO with a truly First Class ham.
 
 Thanks, Don; here¹s to you.
 
 Ted, KN1CBR
 
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Re: [Elecraft] Leaving TP2 connected?

[John Wingard]

The counter probe is inside my k2/100 but not connected to TP2. However,
 it is still plugged into the control board. It's just parked along the 
left side panel and grounded in a dummy jack in the back corner of the
 rig (as per on old tip by Tom, N0SS). Is there a chance of creating problems 
if left this way? I left it
 in primarily to keep from misplacing it when needed.

73 de WB4GLJ

--- On Tue, 4/16/13, Don Wilhelm w3...@embarqmail.com wrote:

From: Don Wilhelm w3...@embarqmail.com
Subject: Re: [Elecraft] Leaving TP2 connected?
To: Eddy k6...@yahoo.com
Cc: elecraft@mailman.qth.net
Date: Tuesday, April 16, 2013, 8:36 AM

Ed,

If you are having trouble getting the K2 filters aligned, you might want to 
refer to the information in the K2 Dial Calibration article on my website 
www.w3fpr.com.  Use Spectrogram (or another audio spectrum analyzer) to be able 
to see the filter passband.
You can download Spectrogram from the home page on my website.

Leaving the counter probe in the K2 should only be done with an unamplified 
K2/10.  If you have the KPA100 or use an external amplifier, remove the probe.

73,
Don W3FPR


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[Elecraft] Elecraft Cases

[John Wingard]

I have just received my custom carrying case from Rose, N7HKW. It's designed to 
hold both my K2/100 and the KAT100 tuner, along with a couple of side pockets 
for small accessories. The quality and workmanship are great! Now I won't have 
any fears of scratching or dinging the equipment since the case is well padded. 
If you need any type of carrying case for any of the Elecraft radios, contact 
Rose at elecraftcov...@gmail.com. You won't be disappointed!

73 de WB4GLJ

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[Elecraft] K2 - Question on control board

[John Wingard]

I'm in the process of upgrading my K2/10 (SN 1057) to a K2/100. I am also 
finishing up the KAT100 tuner and have a question. The tuner instructions state 
to remove C44 from the K2 control board. I have a Revision A control board 
without a C44. It also states that if this is the case, a capacitor may have 
been soldered directly across R7. On my board, a resistor is installed at R7 
(no capacitor). Do I leave R7 in or take it out? Incidentally, I did all of the 
Rev A to B mods a number of years ago, so this looks like the only thing left 
to check on the control board before proceeding.

Tnx de John, WB4GLJ

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