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

[Jeff Kinzli N6GQ]

Don, C31 is the new value, just replaced it a few weeks ago...

-J

On 4/7/07, Don Wilhelm <w3fpr at earthlink.net> wrote:
> Jeff,
>
> In that case, what is the size of C31?  If it is the old .033 uF it must
> be changed to the new .22 uF value.  You can get one from Elecraft when
> they get back in the office, but if you have two .1 uF caps with a
> voltage rating of 50 volts or more, you can parallel them for the time
> being.
>
> 73,
> Don W3FPR
>
> Jeff Kinzli N6GQ wrote:
> > 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
> >>
> >
>