Cap the unused cavity port, don't leave it
open, the port end of the cavity is the
high energy side of the can. You should a
also use a good quality metal.
I've got some engineering paperwork on the
hybrid ring I would share with anyone intersted,
but you'd need three cups of strong coffee
to get through the first few pages.
cheers,
skipp
> Paul Kelley <[EMAIL PROTECTED]> wrote:
> > Paul, when you say "capping"
> > the other port, do you mean shorting it or leaving open,
> > or with stub or what?
>
> Best is to put a cover on the connector to shield it so no
> RF can leak in or out. A type N cap will fit the threads
> of an SO-239 connector. Second choice is to leave it open,
> connect nothing to it. I have been successfully running
> some pass cavities as notch cans this way (open) for some
> time, but I would recommend the cap.
>
> > And, if these old cans are single port, no shunt Ls or
> > Cs, does this mean they will notch as-is or will they
> > need external help?
>
> If they are single port and have no second adjustment (other
> than the main tuning plunger) they should notch without any
> help.
>
> I'm still trying to find a good explanation of the hybrid
> ring theory. Something I just read implied it converts a
> notch can to a pass/notch and probably makes the notch much
> deeper than it would be without the ring... but it was
> pretty fuzzy on the details.
>
> Paul, N1BUG
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