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@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.
--
Mitchell's Law of Committees:
Any simple problem can be made insoluble if enough meetings are
held to discuss it.
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