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biff44 said:There are 2 chief things.
First, you have to have enough isolation so that the transmitter does not blow up the receiver front end.
Second, transmitters put out a lot of broadband noise. That broadband noise can leak to the receiver front end, and cause the system to have something like a 40 dB noise figure! Either you have to turn off the transmitter amplifier when receiving, or have enough isolation and/or bandpass filtering so that the broadband transmit noise is 10 dB less than the the receiver's equivalent input noise. The equivalent input noise might be thermal noise, or environmental noise if you are in a big city.
Rich