[Elecraft] Question about K2 power meter

[David Douglass]

Just in case anyone else is suffering from unstable power out in tune =
mode,
I followed Don=92s advice (as below) and changed R98 on the RF (270ohm) =
board
for a 1.5K resistor (I actually had a measured value of 1.64K on the POT =
but
1.5k was the closest fixed resistor I had).

Now when I enter tune, power output is much more stable, although it =
still
creeps up slightly with time. This makes tuning my DX-1 a lot easier and =
I'm
not tripping the amp out! Power out on 10m is down a little on the basic =
K2
(about 12w max), but I'm still getting 100w with the K2/100..

David, VK2NU






>If the variation is quite bothersome, your K2/100 may be a candidate =
for=20
>increasing the value of R98 (on the bottom of the RF Board) to slow =
down=20
>The power variation.  If you increase it too much, the power output on=20
>the higher bands may decrease (check that with the basic K2, not with=20
>the KPA100 powered).  In most cases, about 1k is the upper limit for =
the=20
>value, but if your K2 has greater gain than the average, you may find=20
>success with even higher values.  It is easiest to substitute a 2k pot=20
>for R98 when testing for the best value, then measure the pot =
resistance=20
>and put in the nearest fixed value resistor.

>This procedure is listed on the Elecraft website - in Builder's=20
>Resources IIRC.

>73,
>Don W3FPR


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5:26 PM
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