Steve,
I have found that behavior in K2s that have some problem with RFC3. Make
certain the leads are well stripped and tinned (you should see some
tinned wire above the board) and RFC3 is wound on the right core - I
have found a few where the builder used the black powdered iron core
instead of the ferrite core.
The winding of T2 can reduce the power on higher bands, but not as
severe as you have, but check anyway to be sure T2 is wound as indicated
in the manual and spaced 1/16 to 1/8 inch above the board.
You will likely have to do some modified transmit troubleshooting using
the test points indicated in the manual, but at a higher power setting
than 5 watts (I would recommend 10 watts setting). At each test point,
compare the RF voltage for 20 meters with that for 15 meters. When you
find the place where the RF voltage for 15 meters is substantially less
than that for 20 meters, you have identified the output of the failing
stage.
73,
Don W3FPR
On 11/8/2014 10:42 AM, Steve Kavanagh wrote:
As I proceed with checking the new-to-me (S/N 5133, bare-bones, no options) K2
out, I'm finding that the maximum transmit power output drops markedly as the
frequency goes up. If I set the power to maximum, I can get the following
approximate powers (on CW):
80m: 15 W
40m: 15 W
30m: 15 W
20m: 7 W
17m: 4 W
15m: 4 W
12m: 1.5 W
10m: 1.5 W
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