Time to reopen this subject just a little !!
I'm currently looking at Icom V-8000 radios for the simplex and repeater radios (0.15uV sensitivity (-123dbm) and 75db spurious/image rejection) The most any transmitter in the system will ever be running is 50 watts (+47dbm) Transmit and receive paths will be separate with 30db of isolation (either split antennas, or a 30db isolation circulator just before the feed to the antenna) That brings the transmit power down to +17dbm (55mw) before any other splitting and filtering to get to the 3 receivers I need to understand the sensitivity and rejection numbers on the radios a bit better. I would think that sensitivity + rejection would indicate the strongest nearby signal that the receiver front end can handle without de-sense .. which would mean (if I'm not totally blowing smoke) that the V8000 could handle a nearby signal at -50dbm. leaving me 67db of isolation that I need to account for in the splitter/filter system connected to the receivers. Am I blowing smoke ?? Is there a way to figure from the usual receiver specs just how much signal can be handled before de-sense occurs ??
