Abstract: A communications system programmable to operate at a selected one of multiple frequency ranges and any one of a plurality of modulations schemes and data rights including an open architectural bus line for linking a plurality of board level units. A single board receiver exciter operates to receive and transmit signals at a plurality of frequencies and contains means for interfacing the single board receiver exciter with the open architectural bus line. A single board modulator demodulator allows for modulation/demodulation and for encoding/decoding of signals. The single board modulator demodulator also includes means for interfacing with the open architecture bus lines so that instruction and programming commands may be received. A single board processor multiplexer controls operations of the single board receiver exciter and the single board processor multiplexer over the communications link created by the open architecture bus line.

Abstract: A system for RF communications utilizing an open architecture bus line is disclosed. The system consists of a single-board receiver exciter, a single-board modulator and a system control processor all interfaced to a standard bus line. All three units are implemented on single-board assemblies and are programmable to perform over a variety of frequency ranges, to operate at one of a variety of modulating schemes, and to utilize varying data rates.