Mobile radio transmitter with normal and talk-around frequency bands
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United States of America Patent
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Jul 18, 2000
Grant Date -
N/A
app pub date -
Feb 18, 1997
filing date -
Feb 18, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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