US3668525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication system
Assignee: Individual
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Filing: 1970-03-12
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Granted: 1972-06-06
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Expires: 1990-03-12
Abstract
Abstract A communication system wherein a relay station comprising a single receiver and a single transmitter is adapted to selectively monitor a plurality of frequencies and transmit the monitored signal in one of a plurality of predetermined frequencies. To accomplish this end a sensing system is operated in conjunction with the receiver and transmitter to sense the incoming signal and lock the receiver and transmitter in an operating condition corresponding to the sensed incoming signal. Assuming that the receiver portion of the relay station is of an FM type, the squelch circuit thereof may be utilized in conjunction with the sensing device to lock the receiver on frequency.
Inventors
- 👤 Robert E Mcgraw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:53
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/15528; H04B7/15542
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A communication relay system for the reception and transmission of radio signals, said system comprising, in combination: a receiver adapted to selectively receive radio signals on a plurality of preselected frequencies; a transmitter adapted to selectively transmit radio signals on a plurality of preselected frequencies, and a sensing device cooperating with said receiver and transmitter including means adapted to sense a voltage amplitude change in the receiver when an RF signal is present on one of said preselected frequencies and upon thus detecting an incoming signal on one of said preselected frequencies to lock said receiver on the frequency of said detected incoming signal and against the receipt of incoming signals on said preselected frequencies which are different from the detected signal so long as the first detected signal is present and key said transmitter for operation on one of said preselected frequencies, said one frequency being different from that one which the receiver is operating.
Claim 2
Dependent Claim
156 words
A communication relay system for the reception and transmission of radio signals, said system comprising, in combination: a receiver adapted to selectively receive radio signals on a plurality of preselected frequencies; a transmitter adapted to selectively transmit radio signals on a plurality of preselected frequencies, and a sensing device cooperating with said receiver and transmitter including means adapted to sense a voltage amplitude change in the receiver when an RF signal is present on one of said preselected frequencies and upon thus detecting an incoming signal on one of said preselected frequencies to lock said receiver on the frequency of said detected incoming signal and against the receipt of incoming signals on said preselected frequencies which are different from the detected signal so long as the first detected signal is present and key said transmitter for operation on one of said preselected frequencies, said one frequency being different from that one which the receiver is operating.
Claim 3
Dependent Claim
39 words
The communication system of claim 1 wherein said sensing device includes switching means connected to said transmitter and receiver for locking said transmitter and receiver on different operating frequencies when said incoming signal is detected and keying the transmitter.
Claim 4
Dependent Claim
43 words
The communication system of claim 1 wherein said receiver is frequency modulated and includes a squelch circuit, said sensing device being connected to an output of said squelch circuit to determine the existence of an incoming signal on one of said preselected frequencies.
Claim 5
Dependent Claim
137 words
A sensing device for use in a relay communication system including a receiver adapted to selectively receive radio signals on a plurality of preselected frequencies and a transmitter adapted to selectively transmit radio signals on a plurality of preselected frequencies wherein in operation signals are received on one frequency and transmitted on another, said sensing device comprising: an oscillator circuit; frequency channel selecting means driven by said oscillator circuit for sensing a voltage amplitude change in The receiver when an RF signal is present on one of said preselected frequencies and thus detecting the presence of an incoming signal on one of said preselected frequencies; and means responsive to the detection of the presence of an incoming signal to lock said frequency channel selecting means against further sensing so long as the first detected signal is present.
Claim 6
Dependent Claim
137 words
A sensing device for use in a relay communication system including a receiver adapted to selectively receive radio signals on a plurality of preselected frequencies and a transmitter adapted to selectively transmit radio signals on a plurality of preselected frequencies wherein in operation signals are received on one frequency and transmitted on another, said sensing device comprising: an oscillator circuit; frequency channel selecting means driven by said oscillator circuit for sensing a voltage amplitude change in The receiver when an RF signal is present on one of said preselected frequencies and thus detecting the presence of an incoming signal on one of said preselected frequencies; and means responsive to the detection of the presence of an incoming signal to lock said frequency channel selecting means against further sensing so long as the first detected signal is present.
Claim 7
Dependent Claim
42 words
The sensing device of claim 4 further comprising switch means responsive to the locking of said sensing circuit to operate said receiver on the frequency of said detected signal and to key said transmitter for operation on one of said predetermined frequencies.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |