--- w7aor <[EMAIL PROTECTED]> wrote:
> Eric Lemmon WB6FLY gave the best response to my
> question of "how
> common is it to place a bandpass fillter betweeen
> antenna and
> duplexer. Most assumed a ham repeater with tx
> circulator and high
> rejection pass/reject duplexer which is correct.
>
>
About 25 years ago I had Wacom retrofit a 4 cavity
bp/br 2 meter duplexer with two pass cavities. One
for the receive side to provide out of band rejection
and one on the transmitt side to make it ballanced
looking if for nothing else. The repeater was in an
area with lots of other transmitters near it. Must
have been over 100 antennas in a 3 block area. Later
I noticed they were offering that design in their
catalog.
Seems most bp/br duplexers do not really have taht
much rejection of out of band signals.
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