Control circuit for a radio transceiver

Claim 2

A circuit for controlling the operation of a radio transceiver in a mobile vehicle or the like comprising input means for sensing the opening and closing of switching means, a power supply circuit having a control input for supplying power from a power source to said radio transceiver in response to a supply signal applied to a control input, second means coupled between said input means and said control input for providing a first supply signal to said control input in response to and during the closing of said switching means, and third means coupled between said input means and said radio transceiver for providing a second supply signal to said control input in response to and during operation of said radio transceiver.

Claim 3

A circuit as claimed in claim 1, wherein said switching means include a vehicular ignition switch and a radio transceiver on-off switch.

Claim 4

A circuit as claimed in claim 1, wherein said radio transceiver is powered after and in response to said first supply signal.

Claim 5

A circuit as claimed in claim 2, wherein said radio transceiver is powered after and in response to said first supply signal.

Claim 6

A control circuit for a radio transceiver comprising a first input for a vehicular ignition switch having open and closed conditions, a second input for a transceiver on-off switch having open and closed conditions, first means coupled to said first and second inputs for sensing the closed conditions of both of said switches and producing a power-on signal in response to both said closed conditions being sensed, second means coupled to said radio transceiver for sensing a communication thereon and producing a latch signal in response to and for the duration of said communication, and third means coupled to said first means and to said second means for supplying power to said radio transceiver in response to said power-on signal or in response to said latch signal, or in response to both said power-on signal and said latch signal.

Claim 7

A control circuit for a radio transceiver comprising a first input for a vehicular ignition switch having open and closed conditions, a second input for a transceiver on-off switch having open and closed conditions, first means coupled to said first and second inputs for sensing the closed conditions of both of said switches and producing a power-on signal in response to both said closed conditions being sensed, second means coupled to said radio transceiver for sensing a communication thereon and producing a latch signal in response to and for the duration of said communication, and third means coupled to said first means and to said second means for supplying power to said radio transceiver in response to said power-on signal or in response to said latch signal, or in response to both said power-on signal and said latch signal.

Claim 8

A circuit as claimed in claim 5, wherein said third means continue to supply power to said transceiver in response to and for the duration of said latch signal, despite the absence of said power-on signal.

Claim 9

A circuit as claimed in claim 5, and further comprising timing means coupled to said first means for producing a predetermined timing signal in response to the termination of said power-on signal, and fourth means coupled to said timing means for terminating said latch signal in response to the termination of said timing signal.

Claim 10

A circuit as claimed in claim 7, and further comprising means for producing an alerting signal in response to said timing signal.

Claim 11

A circuit as claimed in claim 6, and further comprising timing means coupled to said first means for producing a predetermined timing signal in response to the termination of said power onisignal, and fourth means coupled to said timing means for terminating said latch signal in response to the termination of said timing signal.

Claim 12

A circuit as claimed in claim 9, and further comprising means for producing an alerting signal in response to said timing signal.

Claim 13

A circuit for controlling the operation of a radio transceiver substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.

Claim 14

A circuit for controlling the operation of a radio transceiver substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.