>
>Rich replied:
>
>>If the VHF current path through Lsup encounters a different anount of
>>inductance than the VHF current through the through Rsup path encounters
>> (and the magnetic fields from the two current paths are not coupled)
>>two anode-circuit resonances are created. The effect is like tuning an
>>IF transformer for wider bandwidth -- i.e., the primary of the IF
>>transformer is tuned to a different frequency than the secondary is tuned
>>to. The result is increased bandwidth/lower-Q.
>
>I'm having trouble following this. It appears to say that the suppressor
>choke should be made to be self resonant at the same frequency as the
>parasitic resonance circuit, and then damped to have a Q of 1.
No. The two anode-circuit resonances have nothing to do with the
self-resonance of Lsup.
Typical anode-circuits resonate at 60 - 160 MHz. Typical, 100nH Lsups
for 1000w amplifiers self-resonate above 500MHz.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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