Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Patent
1980-07-29
1982-02-23
Bookbinder, Marc E.
Telecommunications
Transmitter
Measuring, testing, or monitoring of transmitter
324 78Z, 324 82, 328141, 331 64, 340658, 455226, H04B 1700
Patent
active
043172237
ABSTRACT:
An RF generator monitor circuit is provided for checking for variation in frequency of an RF generator outside predetermined limits. The circuit includes means for sampling the output of an RF generator, means for clamping the sample signal to prevent damage to the circuit from an exceptionally strong signal, means for converting the clamped sample signal to a positive going square wave, and for amplifying the square wave. Also included is a phase locked loop integrated circuit having the amplified square wave as an input. The phase locked loop integrated circuit includes a linear voltage-controlled oscillator and two different phase comparators. The input square wave signal is compared to the voltage controlled oscillator and an error voltage proportion to phase differences is produced. The error voltage is used as a control for the voltage controlled oscillator. When the input square wave signal is within the predetermined frequency limits the error voltage causes the voltage controlled oscillator to be adjusted to a frequency equal to that of the input signal. When the input signal is outside the predetermined limits the phase comparators provides output signals indicative thereof.
REFERENCES:
patent: 3649909 (1972-03-01), Ort et al.
patent: 3750177 (1973-07-01), Rooks
patent: 3992670 (1976-11-01), Gittins et al.
patent: 4152656 (1979-05-01), Udvari-Lakos
Bookbinder Marc E.
Hallacher Lester L.
Irlbeck Dennis H.
RCA Corporation
Whitacre Eugene M.
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