Transmitter for a radio control device

Details Transmitter for a radio control device Transmitter for a radio control device

1996-04-16

1998-06-09

Pham, Chi H.

Pulse or digital communications

Pulse position, frequency, or spacing modulation

375295, 375371, 332112, 455 92, 455126, 370213, 34082569, 34082572, H03K 704, G08C 1900

Patent

active

057646970

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: 4870699 (1989-09-01), Garner et al.

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