Transmitting and receiving apparatus for incorporation into an i

Details Transmitting and receiving apparatus for incorporation into an i Transmitting and receiving apparatus for incorporation into an i

1995-12-18

1998-05-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 87, 455318, 455264, 331 2, 331 8, 331177R, 331108R, H04B 140

Patent

active

057582653

ABSTRACT:
A transmitting and receiving apparatus configured in superheterodyne form, includes a receiving circuit for receiving a signal on one channel of a predetermined pair of channels and a transmitting circuit for transmitting a signal on the other channel of the predetermined pair of channels. The receiving circuit has a first voltage-controlled oscillator including a first oscillating transistor and generating a local oscillated signal used for receiving the signal on one of the channels, and a first current control means for controlling a collector current of the first oscillating transistor. The transmitting circuit has a second voltage-controlled oscillator including a second oscillating transistor and generating a signal of the frequency of the other channel, and a second current control means for controlling a collector current of the second oscillating transistor. The current control means corresponding to the voltage controlled oscillator generates a signal with a higher one of the frequencies of the predetermined pair of channels increases the collector current of the corresponding oscillating transistor.

REFERENCES:
patent: 4057760 (1977-11-01), Koch
patent: 4380827 (1983-04-01), Moon
patent: 5566360 (1996-10-01), Fenk et al.
International Application WO 93/16530 A1, Aug. 19, 1993.

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