US4549309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transmitting and receiving apparatus
Assignee: Individual
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Filing: 1983-10-18
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Granted: 1985-10-22
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Expires: 2003-10-18
Abstract
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.
Inventors
- 👤 Nigel M. Corrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
In a simplex radio transmitting and receiving apparatus comprising a selector switch means, operation of which causes the apparatus to change from a receiving mode into a transmitting mode, transmission blocking means arranged to prevent selection of the transmitting mode if a signal of predetermined strength is being received by the apparatus at the time the selector switch means is operated, and an over-ride circuit whereby operation of the transmission blocking means may be selectively over-ridden to enable the transmitting mode to be selected, the improvement which comprises means within said over-ride circuit responsive to a control signal generated by said selector switch means to initiate operation of said over-ride circuit, and means within said over-ride circuit responsive to return of said selector switch means to select the receiving mode of the apparatus to terminate operation of said over-ride circuit.
Claim 2
Dependent Claim
140 words
In a simplex radio transmitting and receiving apparatus comprising a selector switch means, operation of which causes the apparatus to change from a receiving mode into a transmitting mode, transmission blocking means arranged to prevent selection of the transmitting mode if a signal of predetermined strength is being received by the apparatus at the time the selector switch means is operated, and an over-ride circuit whereby operation of the transmission blocking means may be selectively over-ridden to enable the transmitting mode to be selected, the improvement which comprises means within said over-ride circuit responsive to a control signal generated by said selector switch means to initiate operation of said over-ride circuit, and means within said over-ride circuit responsive to return of said selector switch means to select the receiving mode of the apparatus to terminate operation of said over-ride circuit.
Claim 3
Dependent Claim
35 words
Apparatus as claimed in claim 1, wherein said means within said over-ride circuit responsive to the control signal is adapted to respond to repeated operation of said selector switch means within a predetermined time interval.
Claim 4
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein said selector switch means comprises a plurality of selector switches electrically connected in parallel.
Claim 5
Dependent Claim
144 words
In a simplex radio transmitting and receiving apparatus, comprising a selector switch, operation of which causes the apparatus to change from a receiving mode into a transmitting mode, transmission blocking means arranged to prevent selection of the transmitting mode if a signal of predetermined strength is being received by the apparatus at the time the selector switch is operated, and an over-ride circuit to cause the operation of the transmission blocking means of preventing transmission mode selection to be selectively over-ridden to enable the transmitting mode to be selected, the improvement which comprises means for generating a control signal, means within said over-ride circuit responsive to said control signal to initiate operation of said over-ride circuit, and means within said over-ride circuit responsive to return of said selector switch to select the receiving mode of the apparatus to terminate operation of said over-ride circuit.
Claim 6
Dependent Claim
144 words
In a simplex radio transmitting and receiving apparatus, comprising a selector switch, operation of which causes the apparatus to change from a receiving mode into a transmitting mode, transmission blocking means arranged to prevent selection of the transmitting mode if a signal of predetermined strength is being received by the apparatus at the time the selector switch is operated, and an over-ride circuit to cause the operation of the transmission blocking means of preventing transmission mode selection to be selectively over-ridden to enable the transmitting mode to be selected, the improvement which comprises means for generating a control signal, means within said over-ride circuit responsive to said control signal to initiate operation of said over-ride circuit, and means within said over-ride circuit responsive to return of said selector switch to select the receiving mode of the apparatus to terminate operation of said over-ride circuit.
Claim 7
Dependent Claim
23 words
Apparatus as claimed in claim 4, wherein the means for generating a control signal comprises an over-ride switch adjacent to said selector switch.
Claim 8
Dependent Claim
213 words
Transmission control means for a radio transmitting and receiving apparatus having a transmitter circuit and a receiver circuit, the apparatus comprising: a transmit press-switch coupled to a transmitter control circuit, operation of the press-switch causing the transmitter control circuit to operate to select operation of the transmitter circuit of the apparatus; a switching means connected between the transmit press-switch and the transmitter control circuit; a detector connected to the receiver circuit of said apparatus, the detector being operably connected to said switching means and arranged to detect receipt of a signal by the receiver circuit, whereby when a signal is detected the detector causes the switching means to open the circuit between the press-switch and the transmitter control circuit until said signal is no longer detected; and an over-ride circuit which comprises control signal detecting means, an over-ride control circuit, and mode-detecting means, the over-ride control circuit being activated by the control signal detecting means upon receipt of a control signal to over-ride operation of the switching means by the detector to close again the circuit between the press-switch and the transmitter control circuit, the mode-detecting means detecting the mode in which the apparatus is operating, and serving to de-activate the over-ride control circuit when a return to the receiving mode is detected.
Claim 9
Dependent Claim
213 words
Transmission control means for a radio transmitting and receiving apparatus having a transmitter circuit and a receiver circuit, the apparatus comprising: a transmit press-switch coupled to a transmitter control circuit, operation of the press-switch causing the transmitter control circuit to operate to select operation of the transmitter circuit of the apparatus; a switching means connected between the transmit press-switch and the transmitter control circuit; a detector connected to the receiver circuit of said apparatus, the detector being operably connected to said switching means and arranged to detect receipt of a signal by the receiver circuit, whereby when a signal is detected the detector causes the switching means to open the circuit between the press-switch and the transmitter control circuit until said signal is no longer detected; and an over-ride circuit which comprises control signal detecting means, an over-ride control circuit, and mode-detecting means, the over-ride control circuit being activated by the control signal detecting means upon receipt of a control signal to over-ride operation of the switching means by the detector to close again the circuit between the press-switch and the transmitter control circuit, the mode-detecting means detecting the mode in which the apparatus is operating, and serving to de-activate the over-ride control circuit when a return to the receiving mode is detected.
References Cited (Backward Citations)
US2721935A
Cited
US4082919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |