Multiplex communications – Wide area network – Packet switching
Patent
1989-03-13
1992-06-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
455 86, 370 24, H04L 514, H04B 156, H04B 140
Patent
active
051230089
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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Kizou H.
Olms Douglas W.
Shaye Communications Limited
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