Communications: electrical – Systems – Selsyn type
Patent
1981-04-09
1982-10-19
Yusko, Donald J.
Communications: electrical
Systems
Selsyn type
328169, 328171, 333173, H04B 302, H04B 1500
Patent
active
043553036
ABSTRACT:
A receiver for a distribution network power line carrier communication system is magnetically coupled to a distribution power line. A carrier signal, phase-shift keyed modulated by an information signal and carried by the distribution power line, is thereby coupled to the receiver circuitry. A first receiver amplification circuit includes an automatic gain control circuit, to prevent saturation of the receiver electronics, and a feedback circuit to determine the gain. The automatic gain control circuit utilizes a field effect transistor which cooperates with the amplifier's feedback circuit to modify the gain. The drain source resistance of the field effect transistor is varied in accord with the magnitude of the received noise or modulated carrier signal to lower the amplifier's gain when excessive positive or negative noise or modulated carrier signal peaks are encountered. The modulated carrier signal is then processed through several filter stages and further amplified. Finally, the information signal is removed from the modulated carrier by a phase shift keyed demodulator. The information is available for input to a remote device which is responsive thereto for performing any of a variety of automated functions.
REFERENCES:
patent: 3857048 (1974-12-01), deLaage deMeux et al.
patent: 3868605 (1975-02-01), Poole
patent: 3898573 (1975-08-01), Sherman
patent: 4016429 (1977-04-01), Vercellotti et al.
patent: 4103243 (1978-07-01), Orban
patent: 4134074 (1979-01-01), Hershberger
patent: 4142178 (1979-02-01), Whyte et al.
patent: 4298970 (1981-11-01), Shawhan et al.
"Automatic Gain Control Operates Over Two Decades", Carl Marco, Electronics, Aug. 16, 1973, pp. 99-100.
Melvin, Jr. Waymon A.
Phillips John S.
Lackey D. R.
Westinghouse Electric Corp.
Yusko Donald J.
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