[Elecraft] Re: Elecraft digest, Vol 1 #243 - 38 msgs

Fri Aug 16 03:52:01 2002

On 15 Aug 2002 at 4:01, Jim Larsen AL7FS wrote:

> I wrote to Gary and described pops or thumps at the end of a key down,
> i.e., if I key a string of dashes as each dash ends the headphones or
> the speaker thumps or pops at the end of each dash.  Sometimes it did
> not do it and at other times the rig was not very useable it was so
> bad.  I never could identify what variable made it happen or not
> happen.

I did get something similar the other week when I was operating 
portable but it was  difficult to be too sure out in the open.  I 
have never had anything like it during operation in the shack.  I put 
it down to possible RF feedback from the 300 ohm ribbon feeding the 
doublet.  There was no earth connection to the rig.  The effect was 
in fact intermittent, as if the feeder moving in the breeze caused it 
to come and go.  The K2 was being powered off a 4AH gel cell, but I 
don't think it had anything to do with the supply.

> Finally the sidetone quit.  I researched my 33,000+ Elecraft message
> files and found that it is possible to have set the sidetone source to
> the wrong source.  I checked.  It is ok.  I changed it over and
> changed it back several times.  I powered up the rig and down several
> times.  I unplugged the rig several times.

I had the sidetone disappear once while I was doing the initial tests 
on my K2 some months back.  Although the sidetone source setting was 
correct, there was no waveform coming out of the micro.  After some 
probing I switched off, and found it was restored when I powered on 
again.  It has worked flawlessly ever since. Judging from other 
mails, perhaps there is some intermittency with the sidetone which is 
not understood.

73s Dave G3YMC
K2 #2498

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