My KPA-100 is finished and after a few trials and tribulations it
appears to be working extremely well now. My initial transmissions
were reported to be fuzzy and buzzy so after a few stressful nights I
tried to figure out what was going on. I also had no PO control on
SSB (CW was fine, and TUNE=20w was confirmed.)
I had a few responses to this issue and RFC15 on the board was fine.
The t-r diodes were fine and voltages around R12 were perfect (134.0v)
Facing the prospect of having to throw the project into the hands of
Elecraft, (I actually had the K2 and option boxed up and ready to
post) I decided to once more opened the KPA-100 up and pulled it apart
and did another final close inspection. The only thing that I noticed
was a small capacitor at the rear of the PC board was very close (if
not touching) the rear facia panel of the KPA-100. I moved it back
with a plastic knife. I ran my soldering iron over all the diodes
mentioned by Gary and Don. I also touched up some others joints
that may have been critical (i.e. around torroids and IC's. I went
through the final realignment procedures again and there wasn't much
to do except a minor bias readjustment.
I put the whole thing together again and bingo! Worked and get good
audio reports.
On 80 and 40mx it still seems to take some time for the PO control
(ALC) to regulate the Power Out (30mx and above it is perfect) on
SSB. But it's controllable now and working fine.
I would like to thank Don Wilhelm and Gary Surrency for their
extensive email assistance on this matter. In the face of dispair
these guys kept the faith.
Kind regards,
Dave.
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