[Elecraft] Elecraft Digest, Vol 255, Issue 28

[Paul Ecker]

Mike
Test msg read
Paul
w2eck

On Sat, Jul 26, 2025 at 5:10 PM <elecraft-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Re: K2, distorted audio signal (Michael Carter)
>    2. K3 no effective TX on 3.5 or 10MHz bands
>       (andy.nehan at btinternet.com andy.nehan at btinternet.com)
>    3. Test message (Michael Carter)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 24 Jul 2025 18:27:39 +0000
> From: Michael Carter <Mike.Carter at unh.edu>
> To: Elecraft Reflector Reflector <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K2, distorted audio signal
> Message-ID:
>         <
> BN0P223MB03919963CC1B2F0C199DE8E3E45EA at BN0P223MB0391.NAMP223.PROD.OUTLOOK.COM
> >
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Wolfgang,
>
> You could try an experiment.  Disconnect your K2, put it in a household
> oven (not microwave oven!) at 100F for about 10-15 minutes, then remove it
> and reconnect to your power supply and antenna.  Check the audio on 40
> meters immediately upon finding a signal.  If that doesn't replicate the
> distortion you observed, then you'll have to wait.
>
> I'll have to think about what temperature-sensitive components might be
> present in the VCO that would be affected on 40 meters but not 20 meters.
> The varactors used in the VCO are switched depending on band, but I don't
> recall if 40 meters uses different varactors from 20 meters.  I'll look at
> the schematic again.
>
> 73,
> Mike, K8CN
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 24 Jul 2025 22:05:21 +0100 (BST)
> From: "andy.nehan at btinternet.com andy.nehan at btinternet.com"
>         <andy.nehan at btinternet.com>
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 no effective TX on 3.5 or 10MHz bands
> Message-ID: <2179cbe.4e54.1983e414346.Webtop.19 at btinternet.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
>
> This happened suddenly. It gives the usual output on all other bands
> using 5 watts as measured using a dummy load and my LP100A power meter.?
> ?
> There is NO output at all on the 3.5MHz band and only 0.4 watts on 10MHz
> band when in data or SSB modes. Interestingly it usually (but NOT
> always) passes the 5watt self test on all bands except the 10MHz band. I
> have the latest firmware installed.
> ?
> Any ideas of how I might fix this would be welcomed as there is no UK
> service available.
> ?
> G4HUE Andy
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 25 Jul 2025 10:14:30 +0000
> From: Michael Carter <Mike.Carter at unh.edu>
> To: Elecraft Reflector Reflector <elecraft at mailman.qth.net>
> Subject: [Elecraft] Test message
> Message-ID:
>         <
> BL3P223MB0385CDCCAE5C83CDA870B5B3E459A at BL3P223MB0385.NAMP223.PROD.OUTLOOK.COM
> >
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> This reflector has been strangely silent, and post I made yesterday has
> not appeared, hence this test message.
>
> Mike, K8CN
>
>
> ------------------------------
>
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> End of Elecraft Digest, Vol 255, Issue 28
> *****************************************
>