Multiple address radio system having automatic radio calibration

Details Multiple address radio system having automatic radio calibration Multiple address radio system having automatic radio calibration

1996-03-14

1999-04-27

Eisenzopf, Reinhard J.

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

455 69, 455 75, 455 76, H04B 714

Patent

active

058989030

ABSTRACT:
A multiple address radio network in which there is a central station and remote radio sites. The central station transmits control and data acquisition signals to the radios at the remote radio sites and the radios at the remote radio sites transmit to the central station acquired data. Each remote radio has an automatic frequency calibration circuit for adjusting its associated remote radio to reduce frequency offset between the radio frequency carrier transmitted by the remote radio and the radio frequency carrier transmitted by the central station by adjusting the temperature compensated crystal oscillator of the automatic frequency calibration circuit. Toward this end, a microprocessor of the frequency calibration circuit detects and measures the offset frequency and controls a digital potentiometer for adjusting the temperature compensated crystal oscillator.

REFERENCES:
patent: H1217 (1993-08-01), Phelps
patent: 4901368 (1990-02-01), Arnold et al.
patent: 4921467 (1990-05-01), Lax
patent: 4932072 (1990-06-01), Toko
patent: 5471657 (1995-11-01), Gharpuray
patent: 5477194 (1995-12-01), Nagakura
patent: 5493710 (1996-02-01), Takahara et al.
patent: 5542095 (1996-07-01), Petranovich
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Article titled "EFM Units Monitor Gas Flow" published in Pipeline & Gas Journal Feb. 1994.
Brochure titled Model 1888 MAS Remote Transceiver was published by Alligator Communications, Inc. Prior to Mar. 10, 1995.
Article titled "Alligator Remote MAS Radios offer `Over-the-Air` Monitoring And Control" published by Alligator Communications, Inc. prior to Mar. 10, 1995.
Brochure titled Model 1800 Master Station Radio published by Alligator Communications, Inc. Prior to Mar. 10, 1995.

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