[Elecraft] K2/100 Flat topping on 30m?

[peter barville]

I wonder if any of you have looked at your K2/100 on a monitor 'scope
with a standard (ssb) two tone test?

Mine looks very good indeed, except on 30m where it begins to flat top
at a power level of around 75 watts. 

Dropping the power to 10 watts (ie with the 100 watt PA stage out of
circuit, but the basic K2 running pretty much at full power) shows a
clean trace. Therefore I have to assume that the flat topping is
occurring in the PA stage.

My first suspicion would be that the low pass filter isn't quite right
at 30m, but the rig will happily run the full 100 watts on cw, and so I
guess it can't be that far off. (Come to think of it, it would be worth
me checking the current drain at 100 watts cw on 30m.)

"Why worry about the rig's ssb performance on a band where we shouldn't
be using ssb" I hear you ask, but that's not really the point. I would
like to think the rig, and PA, are performing correctly.
-- 
7K2, peter g3xjs