[Elecraft] K2/100, half power output on 17-10M

[Don Wilhelm]

Jeff,

Before we give any answer, we need to know the level of the KPA100.
Did you build it from the manual Revision D or the earlier Rev C?
Another way of checking - do you have a toroid at L15 and is RFC10 present?

It is not likely to be a sticking relay problem - that almost never 
happens with the KPA100.

73,
Don W3FPR

Jeff Kinzli N6GQ wrote:
> My K2/100 (#5945) has been working well lately, until I started
> noticing higher output at times, more pronounced with higher SWR
> antennas (i.e. it would more often spike it's output power if
> connected to an antenna with more than 1.3:1 SWR, the output power
> would rise to 140W).
> 
> About the same time, I started noticing lower output power on 10, 12,
> 15, and 17M. Output remains full on 20, 30, 40 and 80M.
> 
> Today I pulled the KPA100 apart, went though and checked and
> resoldered everything around the SWR bridge, and anything that looked
> remotely cold-soldered.
> 
> Put it back together, same issue (well, at least the lower power issue).
> 
> With a setting of anything over 50W, the max output is 50-52W, as
> indicated on the K2 internal wattmeter, or my external wattmeter.
> 
> Any ideas why I'd only get half power on half the bands (and this is a
> new occurrance, I was getting full power before).
> 
> Thanks for any ideas,
> 
> Jeff