> >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.
Do they have short lengths of coax from the Coax T
connector to the top of each cavity or is the T
mounted directly to the top of the cavity? The coax
connectors are all SO-239 and PL-259 type?
> 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?
Probably not in that vintage of cavity.
> > 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.
Depends on the numbers... how much tx power, how good is
the receiver. The problem is the 600KHz split and the Q
of the older bottles. I'd say you're going to need more
parts or help to make something that works as you would
like it to preform.
cheers,
skipp
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