I am assuming you mean 2.2dB of insertion loss, not isolation?
4 cavity duplexers typically offer 75-85dB of isolation and 1.2-1.5dB
of insertion loss, Where 6 cavitys are from 90-110dB. But can your
reciever handle the extra noise?
I would be more concerned about desensing the RX than going the extra
quarter mile or so by making up the .7 - 1dB in loss. You could make
this up by a better cable/less connectors, better antenna, or both.
I saw someone with a Hamtronics repeater that said in the spec sheet
the minimum isolation had to be 105dB to work right and they sold him
a 85dB duplexer, so right out of the box it didn't work right, until
he split the duplexer and ran 2 antennas.
On 5/25/05, Mathew Quaife <[EMAIL PROTECTED]> wrote:
> Just for curiosity sake, and please no debates, I'm only curious at
> this point for knowledge, and to satisfy a question that was asked of
> me. Currently I have a 6 cavity TX/RX duplexer system, which has 2.2
> dB of isolation. The system is running 125 watts into the duplexer,
> getting just somewhat under 90 watts out. How much difference would
> be noticed if the duplexer's were changed to use only 4 cans. The
> difference that I am looking at is how much father would the repeater
> be heard, versus how far it would hear, how much noticable difference,
> considering I get no decense. The repeater is in virtually an RF free
> location. Other than the isolation issue, what else would fall into
> the matter. Thanks again, as I was asked why six cans over 4.
>
> Mathew
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> Yahoo! Groups Links
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