DUPLEX OPERATING CURVES
 
The curves indicate the amount of attenuation (isolation) required between a "typical" transmitter (50 watt) and receiver to prevent greater than 1 dB reduction in a 12 dB SINAD ratio, due to (1) transmitter noise and (2) receiver desensitization. As an example, a 150 MHz duplex station would require approximately 51 dB attenuation of transmitter noise at the receive frequency, and approximately 48 dB receiver desensitization isolation (receiver isolation from the transmitter carrier frequency).
CAUTION: These curves are typical curves and should not be used when accuracy is desired. They are meant to serve only as a guide. For exact requirements of a specific duplex station, contact the manufacturer of the radio equipment.
150 Mhz Duplex Stations

150 Mhz Duplex Stations