[Elecraft] K3 Stopped Transmitting

[Guy, K2AV]

I've had the same problem with #1239.  I have made some observations about
it.  

1) It does not involve the KPA3. 
2) The behavior is as if the power had been set to 0.0 by a program bug.
Cannot hear the carrier externally on CW -- when it's working I CAN hear the
carrier with power set to 0.1 w on the K2 setting next to it.  When it's
working and I set power to 0.0 I do NOT hear the carrier on K2 setting next
to it. 

When power is at 0.0 I still hear some VERY low level phase noise or keying
artifacts. When the trouble is in effect, I still hear the keying artifacts.  

I have several times caused the power to return by simply putting the rig in
TUNE and leaving it there. It will come back to power over a long interval
(5 minutes?) in a very jerky manner and suddenly kick in at 100 watts from
somewhere in the 5-6-7-8 watt range. Idea here was to burn it in or burn it
out.  But neither happens, and it happens semi-randomly -- Seems to happen
mostly when turning it on after cooling off overnight. 

Could this really be an ALC bug?

Is there a diagnostic we can run, or a test procedure to further isolate
this trouble?  Would really love to solve this before the contest season.

Guy.


Jim Brown-10 wrote:
> 
> On Sun, 17 Aug 2008 09:36:04 -0700 (PDT), Ed Schuller wrote:
> 
>>I was using my K3 in the NAQP contest yesterday
> 
> Hi Ed, 
> 
> My K3 is about two months old. Just before NAQP CW, I left it on 
> overnight, having verified that everything was working with N1MM and 
> SO2R (with the MP) the night before. When I came in the shack an 
> hour before start time Saturday morning, I had no RF out at all, but 
> the keyer/paddle made sidetone. By the time I had finished 
> troubleshooting, the keyer had stopped working. It's currently in 
> line for repair in Aptos. Initial diagnosis is that the 10W power 
> amp died. 
> 
> 73,
> 
> Jim K9YC
> 
> 
> 
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