Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1983-10-19
1985-06-25
Bookbinder, Marc E.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
H04B 148
Patent
active
045258635
ABSTRACT:
A transmit/receive switching circuit for radio transceivers includes a switch, which, when closed, provides conduction for two serially connected, polarity opposed diodes. When these diodes conduct, a path is provided for signals from an amplifier, or antenna, to pass through to the receiver. When the switch is open, that path is inoperative so that signals from the antenna (for example, lightning pulses) do not pass through those diodes to the receiver (which passage would cause overloading and damage). Automatic override means, for causing a transistor switch to cease conduction in the event the transistor had been conducting when transmission signals are initiated from the amplifier, include a comparator circuit coupled to compare the magnitude of voltage obtained via a coupling to the transistor switch or to the antenna, against a standard, to cause the transistor switch to cease conduction in the event that the magnitude exceeds the standard.
REFERENCES:
patent: 2924704 (1960-02-01), Horowitz et al.
patent: 3227954 (1966-01-01), Fichter, Jr.
patent: 4203109 (1980-05-01), Ballard et al.
Bookbinder Marc E.
GTE Laboratories Incorporated
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