[Elecraft] K3 and KX3 questions for Wayne

[Edward R Cole]

I am getting 100w on all HF bands with about 4w drive.  Supply 
voltage is 13.71v in Rx and runs 13.12v with 100w output and 13.07v 
with 110w output with 5.2w drive (tests on 14-MHz into a Bird Power 
meter (100H) and Bird Load).
I compared the reading of the 100H element at 50w on 6m with a 50A 
element with nearly identical reading.

But on 6m it takes 7.2w drive and I only see 72w output at 
13.15v.  Advancing drive higher engages the auto-ATT, so it would 
suggest drive is high enough.

A little disappointed that 6m did not develop output per spec (80w) 
though I guess no one would note the difference of 72 vs 80.  I am 
running a 50A Astron PS which indicates 13.71v at the PS terminal  I 
have not measured what that is under load of the KXPA-100 as PS 
terminals are difficult to reach.  Voltage measured with Fluke model 17B+.

I may try adjusting the Astron to 14.2v to see if that will improve 
output; assuming similar 0.6v drop under load would result in 13.6v.

I substituted a No.10 PP power cord for the No.12 cord provided with 
the amp with no discernable difference.

73, Ed - KL7UW
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