PLL-mode radiofrequency module

Details PLL-mode radiofrequency module PLL-mode radiofrequency module

1995-12-22

1998-08-25

Chin, Stephen

Pulse or digital communications

Transmitters

Angle modulation

375376, H03C 300

Patent

active

057990450

ABSTRACT:
A PLL-mode radiofrequency module capable of being connected to a transmitter of any kind. The PLL-mode module is provided therein with a CPU, which functions to vary a waveform of a PPM signal fed thereto from a transmitter body so as to permit a pulse duty ratio of the PPM signal to be about 50%. The PPM signal thus varied is fed to a modulation circuit and then subjected to FSK modulation, so that a PLL oscillator constituted by a PLL circuit and a modulation circuit or voltage control oscillator generates a frequency as indicated by a rotary switch. A carrier frequency controller thus constructed is arranged on a side of the PLL-mode radiofrequency module rather than the transmitter body, so that the PLL-mode radiofrequency module may be connected to a transmitter of any kind.

REFERENCES:
patent: 3562671 (1971-02-01), Honma et al.
patent: 3858116 (1974-12-01), Friedl et al.
patent: 4177426 (1979-12-01), Gaishin et al.
patent: 4368439 (1983-01-01), Shibuya et al.
patent: 5412353 (1995-05-01), Chaplik et al.

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