> 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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