Tony,
That model does not appear in any of my Celwave books- is it possible
that you have a 633-6A-8 unit?
A notch duplexer normally has only one adjustment per resonator, and
most such products can be tuned for almost any split greater than 4
MHz. I wonder if someone tried to invert the tuning- that is, change
the high pass side to low pass, and vice-versa. Doing that will
definitely result in a nearly useless duplexer.
I once bought a clean Celwave 633 duplexer at a hamfest for $3 because
the seller said it wouldn't work. He lived in that part of California
where the 70cm repeaters have a low-in, high-out split, and he thought
that he had to tune the TX side up and the RX side down in order to use
it! Once I got the duplexer on my bench, I simply undid his tuning and
restored it to the correct "polarity." It's still performing very well
in a portable repeater. It doesn't make any difference which side is
used for TX, since both can handle rated TX power.
If the tuning polarity seems okay, go to www.rfsworld.com for technical
support.
73, Eric Lemmon WB6FLY
Tony Dinkel wrote:
>
> Having trouble retuning a 633 8A duplexer from 10 MHz to 5 MHz split.
> Insertion loss seems to be excessive. Does anybody have any experience with
> this model in this circumstance?
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