Re: RF power chain mods and improvements..

ajparent1/kb1gmx
 

On Sat, Jun 9, 2018 at 01:48 pm, Tim Gorman wrote:
As you predicted earlier, this is not optimum. While it increased my
output on 10m from 2w to 4w it also oscillates like crazy. The in/out
are just too close together for a 12db gain amp.
There is the are problem but the power increase didn't track either
as an additional 12DB should have driven the finals to well over 20W....
From 2-4W is only 3db increase.

Why didn't it?  First the pre-driver and driver have issues. and then 
the mmic took off oscillating as the input and output are way too close.

The amplifier from Q90 though the irf510s have to be taken as a system.
Every part of the chain has to meet some reasonable specs or the whole
mess fails.  This is why there is no simple fix.

Allison

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