Single frequency time division duplex transceiver
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United States of America Patent
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Jun 16, 1992
Grant Date -
N/A
app pub date -
Mar 13, 1989
filing date -
Mar 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A time division duplex transceiver incorporating a dual conversion superheterodyne receiver, and in which the first receiver local oscillator doubles as the frequency source for the transmitter. The oscillator is a voltage controlled oscillator VCO forming part of a mixer-type phase locked loop. Frequency deviation in the loop is achieved by mixing the VCO output with a selected harmonic of the output of the second receiver local oscillator. The reference oscillator is a crystal controlled oscillator whose output is switched as between transmit mode and receive mode at a switch before being passed to the loop phase detector. The transceiver is able to rapidly and repeatedly alternate between transmit and receive modes and is thus well suited to time division multiplex operation.
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