FM band multiple signal modulator

Details FM band multiple signal modulator FM band multiple signal modulator

1994-01-28

1995-10-31

Mis, David

Modulators

Frequency modulator

332119, 327119, 331 37, 455 59, 455112, H03C 300, H04B 700, H04B 712

Patent

active

054633567

ABSTRACT:
Apparatus and a method for generating all of the assignable carrier frequencies in the FM broadcast band and for frequency modulating the generated carriers includes a generator of a train of pulses having a crystal-controlled repetition frequency and a specific pulse shape which together produce a spectrum of odd harmonics of the pulse repetition frequency whose separation in frequency is identical to that of the assignable carrier frequencies. This pulse train is then mixed with a 98.0 MHz sine wave to translate the spectrum to the FM band. Simultaneous modulation of all the carriers is achieved by frequency modulating the 98.0 MHz sine wave, whereby the same modulation is imparted simultaneously to all of the carriers.

REFERENCES:
patent: 3541266 (1970-11-01), Klayman et al.
patent: 3739283 (1973-06-01), Colligan
patent: 3806811 (1974-04-01), Thompson

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