Radio control device having crystal high frequency module and hi

Details Radio control device having crystal high frequency module and hi Radio control device having crystal high frequency module and hi

1993-07-15

1997-03-04

Chin, Wellington

Pulse or digital communications

Pulse width modulation

375219, 327 31, 455260, H03K 708

Patent

active

056087586

ABSTRACT:
A radio control device includes a transmitter, in which a crystal type high frequency module equipped with a high frequency circuit corresponding to a frequency band of a carrier and a PLL high frequency module equipped with the high frequency circuit and a PLL circuit for controlling a frequency of the carrier depending on a phase difference between the carrier and a reference signal of oscillator are detachably mounted. Such construction permits the crystal type high frequency module and PLL high frequency module to be selectively used as desired and transmission data to be output by means of the carrier of a desired frequency set depending on the high frequency module. Also, the radio control device includes a receiver which employs a frequency synthesizer system in which a PLL circuit for controlling an oscillation frequency depending on a phase difference between a reference signal and the oscillation frequency is used and includes a frequency selecting means for selecting a required frequency from a plurality of predetermined frequency data and a frequency setting means for fixedly setting a receive frequency on the frequency selected by the frequency selecting means when a power supply is turned on.

REFERENCES:
patent: 4298988 (1981-11-01), Dages
patent: 4317228 (1982-02-01), Hendrickson
patent: 4521916 (1985-06-01), Wine
patent: 4905305 (1990-02-01), Garner et al.

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