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

[Jeff Kinzli N6GQ]

Don, thanks, it's the newest KPA100, just bought/built it about a
month or two ago...

-Jeff

On 4/7/07, Don Wilhelm <w3fpr at earthlink.net> wrote:
> 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
>