Steve,
When comparing the RF voltages between bands, I meant to say to use 30
meters instead of 20 meters as stated.
The idea is to compare one band that is producing full output with
another band that has the low output.
73,
Don W3FPR
On 11/8/2014 2:24 PM, Don Wilhelm wrote:
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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