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List:       elecraft
Subject:    Re: [Elecraft] [K2] Odd AGC problem with K60XV installed
From:       Don Wilhelm <donwilh () embarqmail ! com>
Date:       2020-11-28 23:19:01
Message-ID: ef35046b-4700-0f44-a3fe-8f187b0e3d6c () embarqmail ! com
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Bill,

It is also a mystery to me that it is intermittent rather than a solid 
failure.  That might imply that something is breaking into oscillation 
and overwhelming the VRFDET line.  That is why I suggested you check the 
component placement and the diode orientation.
That intermittent condition can also be caused by a soldering problem 
that takes some time to appear.

For the non-transverter bands, it is only necessary that the 4.7pF 
capacitor be in the circuit and that relay K1 be in the reset position.

If you hear a relay click when this problem starts, then look to the 
firmware on the K60XV to make sure all its related components are in 
place - there are not many.  If you do hear the relay click, one thing 
you can do is to arbitrarily replace the resonator.  While I have never 
seen an intermittent resonator (dead one = yes), it is one possibility.

73,
Don W3FPR

On 11/28/2020 5:59 PM, Bill Coleman wrote:
> Thanks, Don, I’ll check it out when I have a chance next week. I appreciate your \
> suggestions. At the moment, the K60XV and the K2 are about 35 miles apart…. 
> 

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