Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1991-01-03
1992-04-28
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455272, 333134, 333202, H04B 148, H04B 702, H01P 512, H01P 120
Patent
active
051095360
ABSTRACT:
A single-block ceramic filter (102) is coupled to two antennas (142 and 144) for providing both antenna duplexing and antenna-summed diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132) and to a receiver (130), and a second antenna (144) is switchably coupled by the filter (102) to the receiver (130) by diversity control circuitry (101) in response to a diversity control signal (137). A microcomputer (134) in the transceiver (100) is coupled to the receiver (130) for monitoring the received signal strength (135). When the received signal strength (135) drops in level indicating that the signal being received on the antennas (142 to 144) has become degraded due to fading or other interference, the microcomputer (134) changes the binary state of the diversity control signal (137) for switching the receiver (130) between antenna (142) and both antennas (142 and 144).
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Charouel Lisa
Eisenzopf Reinhard J.
Hackbart Rolland R.
Motorola Inc.
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