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Abstract

A frequency division multiplex communications system groups a plurality of communications terminals such that they are coupled onto the communications bus at a single node. Each terminal comprises a fixed-frequency receiver, a frequency-agile transmitter, or both. Each receiver in the system is tuned to a different carrier frequency. Furthermore, the receivers grouped at each node are tuned to carrier frequencies within narrow frequency bands, typically within 2.5 percent of a center frequency, with no overlap between the frequency bands of the several groups. Using this configuration, only one receiver amplifier, one preselector bandpass filter, and one transmitter low pass harmonic filter are required for the plurality of terminals within the grouping.

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First Claim