[Elecraft] Elecraft Digest, Vol 255, Issue 29

[andy.nehan@btinternet.com andy.nehan@btinternet.com]

So I reran the 5 watt calibration and found that I have 5 watts on EVERY 
band.
 
It receives on EVERY band 10MHZ sounds good and strong.
 
Redoing the tests as before I found the 3.5MHz band DID transmit and 
receive OK.
 
BUT the 10MHz band still has minimal output. 
 
I sometimes has to conduct tests a few times before I get an absolutely 
consistent view of whats going on.
 
So thats where I am - I would like to get TX working on 10MHz band, I 
dont use it often but I still want it working if possible.
 
Andy
------ Original Message ------
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To: elecraft at mailman.qth.net
Sent: Saturday, July 26th 2025, 22:37
Subject: Elecraft Digest, Vol 255, Issue 29
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digest..." Today's Topics: 1. Re: K3 no effective TX on 3.5 or 
10MHz bands (Michael Carter) 2. Re: K3 no effective TX on 3.5 or 10MHz 
bands (Michael Carter) 
---------------------------------------------------------------------- 
Message: 1 Date: Fri, 25 Jul 2025 19:24:05 +0000 From: Michael Carter 
To: Elecraft Reflector Reflector Subject: Re: [Elecraft] K3 no effective 
TX on 3.5 or 10MHz bands Message-ID: Content-Type: text/plain; 
charset="utf-8" Hi Andy, What is the receive sensitivity like 
on those affected bands? The 3.5 MHz and 10 MHz bands share no common 
components in either the bandpass filter or lowpass filter sections. 
Those are usually the first line of investigation for band specific lack 
of output power. If those bands have poor receive sensitivity, I would 
check the relays on the bandpass filters for those bands first to be 
sure that you have connectivity through the filter. The 3.5 MHz filter 
also is used on 160 meters with additional capacitors switched into 
place, and the 30 meter filter is shared with 20 meters using the same 
arrangement. Please let us know what your find in receive mode on each 
band. Thanks, and 73, ? Mike, K8CN ------------------------------ 
Message: 2 Date: Fri, 25 Jul 2025 20:57:07 +0000 From: Michael Carter 
To: Elecraft Reflector Reflector Subject: Re: [Elecraft] K3 no effective 
TX on 3.5 or 10MHz bands Message-ID: Content-Type: text/plain; 
charset="iso-8859-1" Another thought, Andy, after I re-read 
your post on this topic. The K3 permits per-band TX power control. I 
wonder if you inadvertently got into that mode on 80 and 30 meters? It 
is easy to check in the menu system. That would be much easier fix than 
looking into the bandpass filter bank. 73, Mike, K8CN 
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Elecraft Digest, Vol 255, Issue 29 
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