Application notes on control of base station transmitter reradiated intermodulation in the land mobile services

RF energy coupled between two or more transmitters radiating simultaneously at the same location can produce reradiated spurious interference at levels exceeding FCC and operational limitations. These notes discuss some practical system design methods for the reduction and control of such intermodulation products. Methods of control including transmitter PA high conversion loss, RF attenuation, isolation and filtering are presented. Examples of system design in the 150 Mc band using these methods are given along with techniques for measuring the results obtained.