Tag generator for a same-frequency repeater

Details Tag generator for a same-frequency repeater Tag generator for a same-frequency repeater

1980-08-11

1982-02-23

Ng, Jin F.

Telecommunications

Carrier wave repeater or relay system

Transmitter/receiver feedback compensation

455 22, H04B 714

Patent

active

043172172

ABSTRACT:
Spillover of RF signal from the output of a same-frequency repeater to the input is reduced by attaching a tag to the output signal. The tag is double-sideband, suppressed carrier to place two spectral spikes, one above and one below the carrier. The tag is applied to the signal in the IF. A tagged signal of variable amplitude and phase is added to the received signal so as to cancel the tag and hence the spillover signal, leaving only the desired signal. A feedback system controls the amplitude and phase of the cancelling signal.

REFERENCES:
patent: 2671850 (1954-03-01), Marcou
patent: 2875328 (1959-02-01), Hare et al.
patent: 3696429 (1972-10-01), Tressa

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