[AMPS] Oscillation

[Jon Ogden]

on 3/6/00 9:42 PM, Ed Diyorio at k6odv@clubnet.net wrote:

> If I key my amplifier (any amp) and run the tank cap from minimum to
> maximum and the grid current shows no change, can I safely assume the amp
> does not have a oscillation problem??

As far as I am concerned, if you are able to do that, then you have a stable
amplifier.  I would put the tank coil on the 10 meter position.  It may not
make any difference, but that's what I did.  Better yet, step it through
every position, etc.

This is similar to doing a load pull test on an amplifier.  You are
presenting a complex load that is basically being rotated around at varying
phase angles. 

This is how I was able to find oscillation problems with my amplifier.

73,

Jon
KE9NA

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

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

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


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