[Amps] Grounded Screen 4CX1500B

[Shawn Tayler]

I have done just the opposite direct for this test, injecting the signal
on the output and watching the level in the input.  I would adjust the
input and output tunning for maximum coupling then the neutralization
adjustment for minimum, watch to keep the loss > 10dB better than the
expected stage gain.

Shawn 
N7LQ


On Tue, 08 Nov 2005 12:09:02 +0000 David Kirkby <david.kirkby at onetel.net>
exclaimed:

> RF feedback was measured by injecting RF in the input and measuring it 
> coming out the output socket with no DC applied, but DC paths in tact. 
> We managed to get that to in excess of 50 dB isolation. Of course it 
> will have no doubt changed at full power as tube capacitances changed, 
> but stability was never knowingly a problem - it never took off.

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