Patent US3919642A successfully refreshed from Google Patents.
US3919642A
Expired / Lapsed
US
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Low cost telemeter for monitoring a battery and DC voltage converter power supply
Assignee: United States Department of the Army
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Filing: 1974-05-17
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Granted: 1975-11-11
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Expires: 1994-05-17
Abstract
Abstract A telemetry circuit for monitoring the battery and DC-to-DC converter voltages of a projectile fuze which includes a frequency modulated transmitter to which signals are fed alternately from a pair of voltage-controlled oscillators. The output frequency of each voltage-controlled oscillator are determined by the battery voltage and the converter output voltage of a fuze circuitry, respectively. A constant frequency signal is provided by a relaxation oscillator to define the sampling rate by which the two DC voltages are monitored on a time-sharing basis. The constant frequency signal is fed to a pair of transistor switches which alternately disable each of the two voltage-controlled oscillators such that the outputs of each of the voltage-controlled oscillators, which comprise a frequency varying modulation signal, are alternately fed to the frequency modulated transmitter.
Inventors
- 👤 Floyd Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/06; G08C15/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A telemetry circuit for transmitting an F-M signal indicative of a pair of DC voltages in a projectile fuze, which comprises: first and second sources of varying DC voltages; first and second voltage-controlled oscillator means, each having an oscillation transistor and a frequency determining capacitor, responsive to the outputs from said first and second sources of DC voltages, respectively, for producing first and second oscillating signals whose frequencies are respectively proportional to the magnitude of said first and second DC voltage source outputs; means for transmitting a frequency modulated carrier wave which alternately receives said first and second oscillating signals for use as the modulating signal for said carrier wave; and control means for alternately disabling said first and second voltage controlled oscillator means whereby said transmitting means receives only a single modulating signal at any given time, said control means comprising means for producing a constant frequency oscillating signal and switching means responsive to said constant frequency oscillating signal for alternately grounding said frequency determining capacitor of said first and second voltage-controlled oscillator means, respectively.
Claim 2
Dependent Claim
176 words
A telemetry circuit for transmitting an F-M signal indicative of a pair of DC voltages in a projectile fuze, which comprises: first and second sources of varying DC voltages; first and second voltage-controlled oscillator means, each having an oscillation transistor and a frequency determining capacitor, responsive to the outputs from said first and second sources of DC voltages, respectively, for producing first and second oscillating signals whose frequencies are respectively proportional to the magnitude of said first and second DC voltage source outputs; means for transmitting a frequency modulated carrier wave which alternately receives said first and second oscillating signals for use as the modulating signal for said carrier wave; and control means for alternately disabling said first and second voltage controlled oscillator means whereby said transmitting means receives only a single modulating signal at any given time, said control means comprising means for producing a constant frequency oscillating signal and switching means responsive to said constant frequency oscillating signal for alternately grounding said frequency determining capacitor of said first and second voltage-controlled oscillator means, respectively.
Claim 3
Dependent Claim
31 words
The telemetry circuit according to claim 1 wherein each of said voltage-controlled oscillator means further comprises a frequency determining resistance means for receiving said output from the respective DC voltage source.
Claim 4
Dependent Claim
39 words
The telemetry circuit according to claim 2 wherein said switching means comprise first and second transistor switches which are alternately rendered conductive for a time period equivalent to one-half the period of oscillation of said constant frequency oscillating signal.
Claim 5
Dependent Claim
26 words
The telemetry circuit according to claim 3 wherein said means for producing a constant frequency oscillating signal comprises a relaxation oscillator which includes a unijunction transistor.
Claim 6
Dependent Claim
24 words
The telemetry circuit according to claim 4 wherein said constant frequency oscillating signal comprises a sawtooth signal having a frequency of approximately one Hertz.
Claim 7
Dependent Claim
43 words
The telemetry circuit according to claim 3 wherein said oscillation transistor of each of said voltage-controlled oscillator means comprises a unijuncTion transistor and wherein said frequency determining capacitor and said frequency determining resistance means are connected to the emitter of said unijunction transistor.
Claim 8
Dependent Claim
49 words
The telemetry circuit according to claim 6 wherein said frequency determining resistance means comprises the parallel combination of a resistor and a transistor, said transistor having an emitter, base and collector, said emitter and base of said transistor connected to receive said output from the respective DC voltage source.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |