Validation of the Cosite Analysis Model (COSAM) for Selected VHF FM Equipments
IIT RESEARCH INST ANNAPOLIS MD
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Measurements were made of numerous interactions at a typical cosite installation results were compared with predictions made by the Cosite Analysis Model COSAM developed by the D0D Electromagnetic Compatibility Analysis Center ECAC. Tests involved six FM voice communications transceivers operating in the 30-76 MHz VHF range. Twenty-five frequency assignments were tested, with several desired signal levels. Types of interactions included adjacent signals, spurious responses, spurious emissions, receiver and transmitter intermodulation 2 and 3-signal mixes 2nd, 3rd, 5th and 7th orders. Results show that model accuracy is adequate for predicting the operational performance of collocated VHF-FM tactical communications equipment. Confidence levels are presented.
- Radiofrequency Wave Propagation
- Radio Communications