Narrow band, SSB, FM transmitter

Details Narrow band, SSB, FM transmitter Narrow band, SSB, FM transmitter

1984-09-10

1986-11-25

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 62, 332 17, H03C 152

Patent

active

046253190

ABSTRACT:
A circuit for producing SSB, FM signals comprises an FM modulator connected to a balanced modulator, both modulators being fed by an audio digital pulse source. When the audio source is off, the balanced modulator will also be off, and the FM signal will not be passed. When the audio signal is turned on, it will be trasmitted by the FM modulator and also turn on the balanced modulator. The FM carrier will be suppressed by the balanced modulator, and the number of FM sidebands will increase, thereby increasing the output bandwidth. Also, the output power/sideband will be decreased. Hence, subsequent filtering to obtain a selected single FM sideband is made easier. The output signal is then passed through a limiter to remove the AM components, and the SSB component is amplified for transmission.

REFERENCES:
patent: 2923887 (1960-02-01), Aiken
patent: 3069679 (1962-12-01), Sweeney et al.
patent: 3275951 (1966-09-01), Maass
patent: 3517313 (1970-06-01), Vasile
patent: 3679992 (1972-07-01), Yerman
patent: 3868599 (1975-02-01), Hirasaki et al.
patent: 3974460 (1976-08-01), Hongu et al.
patent: 4170764 (1979-10-01), Salz et al.
patent: 4321490 (1982-03-01), Bechdolt
patent: 4481642 (1984-11-01), Hanson

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