Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1983-10-18
1985-10-22
Bookbinder, Marc E.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 58, H04B 144
Patent
active
045493090
ABSTRACT:
A simplex radio transmitting and receiving apparatus, has a transmission blocking means which prevents selection of the transmitting mode of the apparatus if a signal of predetermined strength is being received by the apparatus at the time the press-to-talk key is operated. An over-ride circuit enables the blocking means to be disabled in an emergency or if another transmitter has been left operating in error. The over-ride circuit can be activated by, for example, repeated operation of the press-to-talk key, and ceases to operate when the key is released to return the apparatus to its receiving mode. Also disclosed is a transmission control means which can be used to modify existing transceivers to operate in accordance with the invention. In a further feature of the invention, means are provided to detect the higher power consumption of the transceiver in the transmit mode and thereby to give a warning of an unduly extended transmission, e.g. by faulty equipment.
REFERENCES:
patent: 2721935 (1955-10-01), Dorff
patent: 4082919 (1978-04-01), Day et al.
Bookbinder Marc E.
Striker Michael J.
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