K2 Power Fluxuation Question

I have not used by K2/100 - KAT2 in quite some time.  If I set the power control to 80 watts...the unit jumps to 112...then to 101...then to 90 and then to 82 watts and it seems to stabilize there.  Then I key it again at it goes to around 40 watts...jumps to 55 watts and then goes to 82 watts.  

If I let it sit for a minute or two then the first scenario starts again.  When I key it again right after that...the power goes to the second scenario.

It seems to jump to 10 watt increments either up or down.

Never seen this before.  Have anyone seen this before?

Lee - K0WA



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[Don Wilhelm-4]

Lee,

That would seem to be the Power Stability problem with the K2 - it is
caused by too much gain in the RF chain with the KPA100 added in-line.
The cure is to increase the value of R98 on the bottom of the RF Board.
Follow the instructions in the Optional K2 Power Control Mod in the
Builder's Resource page at the Elecraft website or use the direct link
of http://www.elecraft.com/Apps/Power_Control_Mod.html.

73,
Don W3FPR

Lee Buller wrote:

> I have not used by K2/100 - KAT2 in quite some time.  If I set the power control to 80 watts...the unit jumps to 112...then to 101...then to 90 and then to 82 watts and it seems to stabilize there.  Then I key it again at it goes to around 40 watts...jumps to 55 watts and then goes to 82 watts.  
>
> If I let it sit for a minute or two then the first scenario starts again.  When I key it again right after that...the power goes to the second scenario.
>
> It seems to jump to 10 watt increments either up or down.
>
> Never seen this before.  Have anyone seen this before?
>
> Lee - K0WA
>  
>

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