Group,
I have 3 UHF repeaters (TKR850) at one site, and one is getting some
inteference. The system has a single, top mounted (60') DB420
feeding a RX multicoupler (Sinclair with a window filter). From
there it goes to each repeater receiver. On the TX side, each
repeater has it's own antenna, a DB408D (there are two TX antenna at
about the 20' level, antennas are about 6' apart horizontally). I
tried running without any cavities or duplexers, and it worked OK,
but one receiver would get hit and key up. I put a single duplexer
can in the RX path and it helped a lot.
My question has to do with the type of cavity filter to use. I have
some of the MOT square duplexers lying around (BPBR), and some 8"
diameter TXRX cavities (BP only). In a system like this, which is
normally used? Is it normal to put the cavity on the RX side only,
TX side only, or both sides?
I have never seen a multicoupler / seperate TX antenna system up
close, so I dont know what is normally done in industry.
Thanks,
Tracy
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