Mobile radio transmitter with normal and talk-around frequency b

Details Mobile radio transmitter with normal and talk-around frequency b Mobile radio transmitter with normal and talk-around frequency b

1997-02-18

2000-07-18

Tsang, Fan

Telecommunications

Transmitter

Plural modulation

455103, 375261, H04B 102

Patent

active

060919396

ABSTRACT:
A transmitter circuit for use in a mobile radio using both a normal frequency transmission band and a talk-around frequency transmission band is disclosed. The transmitter employs a local oscillator in the modulation circuit that operates at only a single frequency band characteristic. At the output of the modulation circuit, one of two transmission paths is selected by an RF switch. In the normal transmission path, the input signal is output in the normal frequency band. Alternatively, in the talk-around transmission path, the input signal is modulated to the talk-around frequency band and then output. The present circuitry eliminates the requirement for local oscillators having dual operational characteristics.

REFERENCES:
patent: 5373265 (1994-12-01), Davis et al.
patent: 5438684 (1995-08-01), Schwent et al.
patent: 5519732 (1996-05-01), Chester
patent: 5717719 (1998-02-01), Park et al.

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