I would suggest that you have a 'dry' on one (or more) components, the
banging on the side makes another temporary good joint. The only thing
you can do is to go over the board checking all soldered joints and/or
tap individual components with a plastic stick to find the area with a
problem. I know it will be time consuming, but will save embarrassment
in the future
73 Dave G8EGG
From: W B Reese elecra...@radions.net
Subject: [Elecraft] K2 Intermitt
To: elecraft@mailman.qth.net
Message-ID: 200903041709.n24h9q3a003...@b.mail.sonic.net
Content-Type: text/plain; charset=us-ascii; format=flowed
Dear Elecrafters,
For some years now my K2/100 S/N 838 has had an intermitt.
When I take it to a new location, it is generally jostled somewhat in
moving it and hooking it up.
When all installed, everything works perfectly,... then...
Without warning, the received tone on the other guy gets holes in
it. Like a noise blanker is cutting out the audio on noise bursts,
only the noise blanker is off and these holes are much bigger than
noise blanker holes. The holes get bigger and bigger until you can't
read the other station, then, mysteriously, they go away and all is
normal. If you are transmitting during one of these episodes, the
other station will report that you are breaking up.
Whatever it is, affects both transmitt and receive the same.
Some years ago I discovered that unplugging the anderson power
connector on the rear and plugging it back in cleared the problem,
but it troubled me that this is not a very good way to turn
transistors on and off and it could result in transients. It
certainly made a loud pop in the loudspeaker. Obviously, there was
a problem in the power cord ! So the cord was replaced and the VCC
was measured during a breaking up episode and found to be stable
inside the K2/100. So it was not the power cord.
The next solution was to turn K2 on it's left side and hit it with a
good smart whack with my fist. After one or two of these, the
problem clears and does not come back until K2 is taken on a trip,
and then it starts up again.
An easy fix and much less potentially destructive than jerking the
power cord in and out. Never the less, still embarrassing on field
day when I'm out with the boys.
Does anyone have an idea what might be causing this ?
Thanks,
TR, WB6TMY
K2/100 S/N 838
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