October 1974 | NTIA Technical Memo OT TM 74 182

AN/FRC-80(V)3 retune and time division multiplex interface investigation

Joseph E. Farrow

Abstract: An analog FM microwave radio was tuned and tested to published specifications. Appropriate interface changes were determined and made to permit this radio to handle a 12.6 Mb/s 3-level partial response digital baseband. Pilot, orderwire, and combiner operation were investigated. Bit error rate perfor­mance as a function of received signal level, orderwire sub­carrier frequency and deviation, and radio pilot level were investigated and reported. The radiated spectra for several variations of the above parameters are included.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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