I have been looking at UHF duplexers in case I decide I should "upgrade" or not after I do some range and desense testing. I currently have a UHF repeater with a Celwave 6 cavity mobile duplexer. Looking at the specs it says it has 75dB isolation. Looking at Sinclair mobile and the larger Res-Lok 4 cavity the isolation specs are similar (again 75 dB). The obvious difference I see is power handling capability and maybe some insertion loss differences. The mobiles are limited to 50W and the bigger ones are 350W or so.
Bottom line is that for a low power station (25W) in a low RF environment, I am not seeing that the benefit is there. You have to step up to very expensive Sinclair 6 cavity Res-Lok or PD526 before you get to 90+ dB isolation. If your running 100-200W, sure I can see it.
Everyone says to use a external duplexer, but unless you go top of the line, I don't see the benefit over a good mobile duplexer (assuming lower power). I feel like I must be missing something, At lower power, why would the Sinclair Q322E be better then their (or Celwave's) mobile duplexer?
Thanks
Bottom line is that for a low power station (25W) in a low RF environment, I am not seeing that the benefit is there. You have to step up to very expensive Sinclair 6 cavity Res-Lok or PD526 before you get to 90+ dB isolation. If your running 100-200W, sure I can see it.
Everyone says to use a external duplexer, but unless you go top of the line, I don't see the benefit over a good mobile duplexer (assuming lower power). I feel like I must be missing something, At lower power, why would the Sinclair Q322E be better then their (or Celwave's) mobile duplexer?
Thanks