[Elecraft] K2/100 Power dither and R98

[W3FPR - Don Wilhelm]

Bill,

As stated in the change documentation, the limiting factor is the power
output on 10 meters.  Change it to a higher value and see what happens.

73,
Don W3FPR

> -----Original Message-----
>
> In setting up to use the K2/100 with my newly acquired AL-80A, I
> found that the K2/100 power output 'dithers' about 5-9 watts a few
> seconds after being keyed, depending on the band a power level. This
> makes it difficult to tune the amplifier, as the shifts in power
> output cause changes in Ip, Ig and power out that are unrelated to
> the tuning adjustments.
>
> I found the technical article on adjusting for this by changing the
> value of R98. Rather than go through the complicated procedure, I
> just changed the value of R98 to 1k, then re-checked the power output.
>
> Interestingly, before the change, the output on 10m was about 90
> watts, max. After the change to 1k, it is still about 90 watts.
>
> The amount of dither has decreased quite a bit, but it is still
> evident enough when tuning the amplifier. I wonder if it would be OK
> to try larger values, such as 1.5 or 2 k. What's the limiting factor
> in choosing this resistor?
>
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>              -- Wilbur Wright, 1901
>
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