Title: Two-way communications system and method of synchronizing

Abstract: A control unit and a remote unit each including a transmitter and receiver with the remote unit transmitter and control unit receiver being synchronized first by means of a variable oscillator in the control unit and connected to the receiver in a closed loop, and the transmitter of the control unit and receiver of the remote unit being synchronized second by sensing errors between a received signal and the operating frequency of the receiver in the remote unit and transmitting the error signal back to the control unit by way of the previously synchronized transmitter/receiver for controlling the frequency of the transmitter in the control unit.

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Inventors: Groth, Jr., Edward J. (Scottsdale, AZ, US)

Application Number: 019378
Filing Date: 1979-03-12
Publication_date: 1980-10-21
Assignee: Motorola, Inc. ()
Primary Class(es): 370/294 178/69.6, 370/507, 375/356, 375/358
Other Classes:
US Patent Ref:

3546701	Dec, 1970	Kurth	343/179.
3550134	Dec, 1970	Kurth	343/179.
3795772	Mar, 1974	Hill	179/15.
3825830	Jul, 1974	O'Connor	343/181.
4019138	Apr, 1977	Watanabe	325/17.
4053889	Oct, 1977	Johnson	343/17.
4075427	Feb, 1978	Matisson	179/15.

Other Refs:
Primary Examiner: Stewart, David L.
Assistant Examiner:
Attorney: Parsons; Eugene A.