[Elecraft] KPA-1500 Power Output Variation

[Jim McCook]

Don,

I'm seeing the power changes on the front panel of the amp, on the 
Utility, and on the Bird external to the amplifier.  The Bird 2500w slug 
is about 40 years old, so it probably needs recalibrating.  Still, I can 
see the relative differences at all 3 spots.  There is no fault in the 
amp when it hits the high power level around 1700w.

My attenuator idea was to put it at the input of the transmit section of 
the amp, out of the receive line..... in the same place as the built in 
attenuator.  It still seems to me it would help for reasons I mentioned 
before.  With low drive levels the output is most sensitive to 
relatively small changes in drive.  I think the idea of running the K-3 
closer to rated output is still desirable.

Thanks, guys, for all the input.

Jim W6YA