KA3SGM
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Premium
join:2006-01-17
West Chester, PA
clubs:
 ·Verizon FIOS
| said by UHF  :with 600khz spacing you need really good duplexers, pass only isn't going to cut it, there will be de-sense. You need the bigger pass/reject cavities. Most duplexers made for non-ham use just won't tune for ham use. Not always true, most of the WACOM cavities that I have seen in HAM use work quite well, and they are only 5.5" diameter, and maybe 24" tall.
They however are usually rated for 137-170MHz.
Mind that I am also referring to a set of 4 cavities(2 TX Pass/ 2 RX Reject)
Depending on TX power, other co-located repeaters on nearby frequencies, or using 2 antennas(1 TX/1 RX) with a bit of vertical separation, it might still work.
Due to the high silver plating content inside the cavities, is the option a $1k+ replacement, or can you have the cheaper solution make do??
Not saying it will work, but there are quite a bit of other variables in your situation to consider.
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