DC decoupled radio communication system

Details DC decoupled radio communication system DC decoupled radio communication system

1988-12-15

1990-09-11

Olms, Douglas W.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 89, 455 74, 455344, 374 58, 374100, 358400, H04B 144

Patent

active

049568760

ABSTRACT:
A radio communication system includes a radio unit, an interface circuit, a microphone and a fascimile unit. The interface unit includes a transformer through which signals are transferred between the radio unit and a seelcted one of the microphone and the facsimile unit so that d.c. components of the signals cannot be transferred. The interface circuit also includes a first relay connected between one winding of the transformer and the microphone and the facsimile unit and a second relay connected between the other winding of the transformer and the radio unit. The system also includes a mode select switch which is operatively coupled to the first and second relays. Thus, mode select signals are also d.c. decoupled signals.

REFERENCES:
patent: 4106025 (1978-08-01), Katz
patent: 4773080 (1988-09-01), Nakajima et al.
patent: 4796091 (1989-01-01), Nohtomi
patent: 4809297 (1989-02-01), Polansky et al.

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