I had a similar experience a few weeks back -- tuned up a 20m
hamstick dipole on 40m just for grins and had smoke come out when I
started using the rig. Returning to more normal conditions, it seemed
fine, but I took it to the bench anyway and pulled out the ATU and the PA.
I couldn't find anything that looked unhappy. The ATU had given me a flat
match, so I assumed that the PA was fine and the ATU was overheating. I
chalked the smoke up to left over flux burning off one of the ATU toroids
(there was a white reside at the base of one of them), but I never did
find anything conclusive. I might have had a better idea if I'd been able
to smell something, but whatever it was, it didn't leave an obvious oder.
On Mon, 1 Sep 2008, [EMAIL PROTECTED] wrote:
Was experimenting late at night with multiple antenna switches, switching
an amplifier in and out of line, etc, when I inadvertently transmitted CW @
100W through a combination of switches that resulted in no antenna at all
being connected.
Urghh. After two or three seconds of transmitting CW, dark smoke wafted up
from the top of the K3 cabinet.
I assumed that I had fried the final amplifiers, but after correctly
switching in an antenna, the rig went on working as if nothing had
happened.
Since that time I have worked domestic and DX, CW and SSB, no problem, full
output.
Anybody have any experience in this regard, any other tests I should make
other than looking at final output into a matched antenna? Any idea what I
could have cooked that didn't effect further operation?
best
Tim
N5IIT
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