[Elecraft] Torture Testing K3/100 #1278...

[Jessie Oberreuter]

      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, Timothy.Urban at wc.ey.com 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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