[Elecraft] Strange KPA100 behavior

[Don Wilhelm]

Mike,

Is the K2 displaying 165 watts?  Or is the K2 displaying 0.2 watts or 
lower while an external wattmeter is displaying 165 watts?
What is your test setup that gives you a 7:1 SWR?  If you are feeding a 
resistive 50 ohm dummy load with good coax, the wattmeter (either 
internal or external) should read 1:1 even with a KPA100 problem.

Tell us more so we can help with your problem -
Taking a very wild guess, you either have a non-functioning wattmeter in 
the KPA100, or the KPA100 wattmeter is not calibrated, or you have a 
parasitic oscillation in the KPA100.

Since this is a new kit - do you have blue toroid cores at L16 and RFC1 
or do you have red toroids at L15 and L16?  And tell us what the value 
of C31 is and whether you determined the value by looking at the 
capacitor (preferred) or whether you just looked at the parts 
list/schematic.

We need the answers to all these questions before we can advise you further.

73,
Don W3FPR

Mike Geddes wrote:
> Greetings. I recently finished my K2 KPA100 kit. It seemed to work okay 
> initially, then last night started to exhibit some strange behavior.  It 
> would transmit correct power on tune under 11 watts (and show low SWR), 
> but on anything over 11 watts, on tune, it would transmit around 165 
> watts and show an SWR of around 7:1!!  And giving High Current message 
> Is there anything I should start looking for initially?
> 
> Any suggestions are appreciated.
> 
> Thanks,
> Mike
> N4JX