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

[aj9c at indy.rr.com]

For me this problem exists.  ATU bypassed.  Pwr to 100w.  Everything is nor.  Antenna is c31xr swr 1 to 1.1.  also testd with dummy load.


---- Alexandr Kobranov <kobranov at amoscz.cz> wrote: 
> Hi John,
> 
> can you - and the rest of suffering by this problem - put here some 
> more details about your setting:
> - POWER per Band active?
> - TUN PWR -nor- or any value defined?
> 
> Just to have complete picture.
> 
> Did you try to chenge some settings with some change in behaviour?
> 
> Thnaks,
> Lexa, OK1DST
> 
> 
> 
> WA6L napsal(a):
> > 
> > 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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