> I have procured a set of Decibel D4140-2C cavity filters
> (just 2 cans) setup for 153.695 pass and 153.290 reject.
> These are notch-type cavities (I guess) since they have
> only one loop port each.
I'm not familiar with those particular cavities, but many of
the Decibel pass-reject cavities only have one loop /
connector. Is there a piston trimmer right beside the RF
connector?
> I've been thinking about trying
> the "hybrid ring" technique with these, cascaded on the
> rx side (leaving the tx side as straight through to the
> antenna). It's a quiet site, and the antenna will be a
> Ringo mounted on the side of the tower at about 50 feet.
Umm... I need to review the operating principle of the
hybrid ring duplexer, but how would you get both protection
from the TX carrier and TX noise on the RX freq with that
configuration? This may be a stupid question... as I said
I need to review the theory on that... been a LONG time...
Paul, N1BUG
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