[Elecraft] Elecraft Digest, Vol 264, Issue 21

Tue Apr 28 23:05:27 EDT 2026

Sent from my iPhone

> On Apr 28, 2026, at 12:02 PM, elecraft-request at mailman.qth.net wrote:
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> Today's Topics:
> 
>   1. Re: High SWR in to dummyload on 6/10M (Peter)
>   2. K3 vfo knob allen wrench size (Jim Rhodes)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 27 Apr 2026 19:01:22 +0200
> From: Peter <pc2a at pi4cc.nl>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] High SWR in to dummyload on 6/10M
> Message-ID: <9c79353b-bc8d-4161-975b-32c4149a3c21 at pi4cc.nl>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> Hi Joe
> 
> Thanks for your response.
> I have reinstalled the ATU in the K3, as you indicated, turned on the
> tuner and tuned it in a dummy load.
> Now everything is OK again, also in bypass mode.
> 
> That was simple :-)
> 
> 73 Peter
> PC2A
> 
> Op 27-4-2026 om 17:16 schreef Joe Subich, W4TV via Elecraft:
>> 
>> Did you try engaging the KAT3 on 10 and 6 meters and *tuning* into
>> the dummy load?? After that, bypass the tuner and check the SWR.
>> 
>> The KAT3 (as opposed to the KAT3A) has no hard bypass.? To bypass
>> the tuner, the K3 selects the "tuned to 50 Ohm" state.
>> 
>> Note: the tuning solutions (including bypass) are stored separately
>> for ANT 1 and ANT 2 but are not reset if one changes KAT3 boards.
>> 
>> 73,
>> 
>> ?? ... Joe, W4TV
>> 
>> 
>>> On 2026-04-27 10:19 AM, Peter via Elecraft wrote:
>>> Hi
>>> 
>>> I have a K3 that needs some maintenance.
>>> The SWR on 10 and 6 meters is high (1:2).??On the bands below it is
>>> OK (1:1).
>>> The ATU had a burnt L? (L10 (IF stage trap)). Both the C and the L
>>> have been removed and a jumper has been installed.
>>> 
>>> After reinstalling the ATU, there was hardly any change. The SWR was
>>> now 1:1.9 on 10 and 6 meters.
>>> After this, the ATU was swapped with another ATU from a properly
>>> working K3.
>>> However, the SWR on 10 and 6 meters remains unchanged and high.
>>> 
>>> A second test was swap the output pin from ATU to PL259. On ANT 1 the
>>> SWR remained bad and on ANT 2 it was good.
>>> 
>>> Then, I directly connected the PL259 on the back to P70 on pins 17-20.
>>> Now the SWR is OK on all bands.
>>> 
>>> In my view, the cause lies in the control via the P70 pin 1-5 because
>>> I tested it with 2 ATUs that react the same way.
>>> Does anyone have a tip on how to check its operation?
>>> 
>>> 73 Peter
>>> PC2A
>> 
>> 
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> 
> 
> ------------------------------
> 
> Message: 2
> Date: Mon, 27 Apr 2026 13:19:31 -0500
> From: Jim Rhodes <jimk0xu at gmail.com>
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 vfo knob allen wrench size
> Message-ID:
>    <CALhxr4Yobdf_LatKKyjDVTfqQU_zh=b7mqP=yL98pEyMMLmm+w at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
> 
> My K3 just got back from the mothership and I cannot get the light,
> original VFO knob back off of the shaft.  The 2 that I have in my K3 parts
> bin seem to both not fit the set screw in the original knob that I put back
> on to ship it to them.  The screw seems to be stripped out and the tiny
> little allen wrench that came in the kit just turns without moving the
> screw.  The Heavy knob has a set screw that fits the slightly larger wrench
> that came with it. The only thing I can think of to do is to get a reverse
> twist drill bit of the appropriate size and try to get it out that way.
> Any other suggestions?
> 
> --
> Jim K0XU
> jim at rhodesend.net
> 
> 
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> End of Elecraft Digest, Vol 264, Issue 21
> *****************************************