[AMPS] A Question re Power Levels

[Tom Rauch]

> 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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