Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1986-10-31
1989-03-28
Griffin, Robert L.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455182, 455197, 455200, 375 97, H04B 140
Patent
active
048171921
ABSTRACT:
An automatic frequency control (AFC) circuit is disclosed for use in an SSB radio transceiver having the capability of transmitting and receiving SSB and FM data signals over any one of a number of communication channels having equal bandwidths. The dual-mode AFC circuit includes AFC circuitry which is capable of tracking the frequency of either: (a) a first radio frequency (RF) carrier having voice signals modulated via a signal sideband amplitude modulation within a first channel bandwidth by locking to the reduced pilot carrier transmitter with the SSB signals; or of (b) a second RF carrier having high speed data signals modulated by narrowband frequency modulation within the designated channel bandwidth. The AFC circuit also includes control circuitry to memorize the AFC control voltage during the time the mobile is transmitting, and to assist the acquisition of the FM data carrier by varying the AFC sweep rate on the signalling channel.
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Eastmond Bruce C.
Phillips Sharon E. T.
Boehm Douglas A.
Griffin Robert L.
Kuntz Curtis
Motorola Inc.
Warren Charles L.
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