At 10:12 AM 3/28/05, "axe1990" <[EMAIL PROTECTED]> wrote:
>I have what I think is an old vhf mobile phone duplexer. It has four
>cavities. The cavities are marked with three as TX and one as RX. Can
>anyone tell me are these all pass type cavities ? Or could any of them
>be notch type ? This seems to be the common pattern of cavity set-up
>for these mobile phone duplexers.
>
>Thanks
If it's the kind I'm thinking of it's a notch-only device, and
only works with lower powered TXs. There is absolutely no
pass functionality, thereby allowing any and all nearby RF
complete and free access to the RX front end. This means
that they are only practical at a repeater site unless you
are the only system there.
The 4-cavity units come in both three-and-one and two-and-two
designs. I've also seen 6-cavity units in four-and-two and
three-and-three arrangements.
Mike WA6ILQ
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