> If I operate my amplifier at it's rated maximum power input of 4 KW (into
> a dummy load), and the (hypothetical values) plate impedance is 2000 ohms
> and a Q of 12. The tuning capacitance is 45pF and the fixed inductance
> value for that band is 4.5uH.
>
> If I reduce the Ep to 3000 volts and adjust the loading, etc. until the
> anode current gives me a plate impedance, again, of 2000 ohms, will the
> tune capacitor (again) resonate at 45pF? If the tune capacitor value is
> different, what factors will affect the difference?
>
> Thank you for your input on this subject.
>
> Dave, WT8R
You didn't say what you started from for HV.
If HV is nearly constant, and current is reduced, operating Q will
increase and the tank will have to be re-adjusted.
Of course if you adjust the tank for 2000 ohms and the loadline
remains the same from high power to low power, the Q remians the
same. If current and voltage are reduced in the same approximate
proportion Q will remain nearly the same, and the tank won't need
retuned at all.
73, Tom W8JI
w8ji@contesting.com
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