UHF 380-512MHz 50W DUPLEXER for Two Way Radio Repeater N/M/BNC Connector

I've been jumping through hoops blaming and replacing everything else before finally narrowing it down to the receiving frequency on this duplexer. I don't think it was tuned properly when I received it. When I don't use the repeater, I get a loud and clear signal over 30 miles away but once I use the repeater, the receiving signal is weak. I've replaced the Antenna, Cables, and Power Supply and it still didn't solve the problem. Now I have to figure out how to test and tune this thing by buying even more equipment. I haven't been able to use it.

Nice unit that works well. No reflected power what so ever. Reads the same as the antenna by itself!

As it turns out, this duplexer is not so great. It absolutely will not hold alignment. It was ordered tuned to a specific pair. Upon arrival it was close, but off. Placed on the bench by an experienced LMR tech with service monitor; it aligns well: achieving over 85 dB separation. However when you come back to it hours later it has wandered and has lost its isolation, closer to 60db isolation. Replaced it with a Sinclair MR356 and issues resolved. I’d steer clear of this one.

Works well. I'd buy another.