Ok
What's the exact procedure for finding the ..'1db compression point' on a HF
amp ??
I have conflicting info on the procedure. With hardly any drive, the typ HF
amp has a
lot of gain. As drive levels increase, the gain goes down. Question is....
where is the
starting point of all this?? With 1 watt of drive... or 5w or what ? It
makes a big diff
to the results.
I'm assuming the amp is 1st tuned to say normal power output... like
1200-1500w out..
IE: tune and load tweaked for max power out at normal power, then maybe
increase the
loading a tiny bit [ slightly more Un meshed].
Then leave the tune and load caps alone... and reduce drive to a very small
amount... and then measure
both the drive to the amp... and also the power output of the amp [ say 1-5 w
of drive.. and 20-100w out]
Then start increasing drive level a bit and measure the gain once more [
it should be dropping off a bit]
Does this procedure have to be done with a cxr.. or can we do it pulse tuned ??
Have I even got the
procedure any where near correct??
I take it, we don't want to operate the amp beyond the point where the gain
drops by 1 db ? But
where is the starting point ?
I can also tweak the bias on the GG amp quite a bit.
tnx.... Jim VE7RF
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