[AMPS] Tank circuit pi-network at VHF

[Jon Ogden]

Ok all,

I've done some more thinking about a couple of my posts this evening.

If the output pi-network of an amp operates like a filter and filters out 
or rejects VHF energy, then how possibly could a VHF parasitic 
oscillation cause a bandswitch arc?  Unless I am way, way off on my 
filter concepts, the majority of any VHF energy should be  reflected back 
toward the anode upon it hitting the pi-network.

If VHF energy can get through the pi-net and to the bandswitch, then we'd 
also see lots of harmonics in the output spectrum since an oscillation 
and the PAs harmonics are at the same frequency.

Anyone care to poke some holes in this?

73,

Jon
KE9NA


-------------------------------------
Jon Ogden
KE9NA

http://www.qsl.net/ke9na


"A life lived in fear is a life half lived."


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