[Elecraft] K3 - Strange problem on 10 Meter SSB with power out

[WA6L]

I have been having a similar problem on 30m through 160m.  Output is fine on
CW on all bands.  On SSB, I am gettting only about 50 watts on those low
bands.

It appears to be hardware related, at least in my case.  I have been doing a
lot of remote troubleshooting with Gary Surrency, and at this point and
awaiting my RSA for repair service.

73,

John, WA6L


williamsonr wrote:
> 
> If this has previously been discussed - please forgive me.
> This weekend ten meters was "open" (as much as it could be at the bottom
> of a cycle) and the 10-10 contest gave me a great opportunity to try out
> the 10 meter band on my recently completed K3 #1318(latest firmware).  All
> seemed well until I noticed that my power output on SSB was down as
> indicated on the K3 power meter and where I normally see 100 watt pep
> output on my tuners average reading meter.  So I grabbed my Bird 43 (with
> PEP option) and a dummy load.  Sure enough, only about 50 watts PEP even
> though the control on the K3 is at 100?  Placed the K3 into tune and
> 95-100 watts out?  Go back to SSB and now the PEP power is back where it
> should be at approx 100 watts PEP.  After a few more SSB transmission -
> low power again(still connected to the Bird and dummy load).  This went on
> for a while as I checked and re-checked all of my mic and comp settings. 
> All other bands worked correctly.  Power supply not current limiting, all
> connections/cables good (connection to my stati
>  o!
> !
> n ground verified), fresh battery in my studio mic, SWR on ten meter
> antenna below 1.4:1 etc. etc.  Took the LPA heat sink bottom cover off to
> make sure the LPA transistors were making good thermal contact.  (I had
> added a spot of heat sink compound to each transistor during my assy
> process) There was a clear outline of the TO-220 transistor and an even
> film of compound indicating good pressure and contact.  Put everything
> back together. Haven't seen the issue again - yet?  But I am not convinced
> I did anything to make it go away?
> 
> Anyone else had this experience?
> 
> Rodger
> N4NRW 
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