[AMPS] resonance

[Rich Measures]

>
>John, NS1Z, says
>
>
>>I'll concede the pi is back to back Ls but, if it is not resonant at the
>>operating frequency, what is it that everyone is tuning it to....
>
Maximal output and minimal input SWR. 

>Firstly, it depends on how you define resonance. When the Q is low, then it
>matters very much which definition you use. The one that is useful when
>applied to all circuits is that the voltage and current at the input are in
>phase. 
>
>Especially if there is ANY load reactance, then that's different from the
>sum of the inductive reactances being equal to the sum of the capacitive
>reactances.
>
>So Rich could be right, or he could be wrong, depending on how you look at
>it.
>
>This time, I agree with him.
>
An experiment:   optimize/tuneup an amplifier's output tank and input pi 
networks for a specific band using a 50 ohm termination on the amplifier. 
 Shut the amplifier down.  Use a dipmeter to measure the resonant 
frequencies of the input and output pi-networks.  .  It may be helpful to 
check the dipmeter accuracy with a freq. counter.  



Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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