US3919646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning receiver
Assignee: HY GAIN ELECTRONICS CORP
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Filing: 1974-05-06
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Granted: 1975-11-11
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Expires: 1994-05-06
Abstract
Abstract To permit a scanning receiver to automatically or manually scan a plurality of crystals of a local oscillator, a counter receives short-duration timing pulses, with the coincidence of certain of the timing pulses and a signal derived from the squelch circuit in the automatic mode causing the counter to step from position to position, energizing a different crystal at each position, the stepping in the manual mode only occurring when a push-button switch is closed. To conserve power, indicator lamps and, in one embodiment, other portions of the receiver such as the IF and audio portions of the receiver are energized with timing pulses during scanning, with the timing pulses being relatively short in duration.
Inventors
- 👤 Eugene L Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:53
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J5/00; H03J5/24; H03J5/246
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
453 words
A radio receiver comprising means for receiving radio frequency electrical energy and signal processing means for selecting certain wavelengths of said radio frequency electrical energy and for producing audio intelligence froM said wavelengths of radio frequency electrical energy, said signal processing means comprising: a plurality of pulse-controlled circuits for intermittent operation upon the application of electrical pulses; a pulse generator; means for connecting said pulse generator to certain of said plurality of pulse-controlled circuits during at least a portion of the operation of said radio receiver, whereby certain portions of said radio receiver operate intermittently so as to conserve power; variable tuning means for selecting certain wavelengths of said radio frequency electrical energy; said variable tuning means comprising at least one mixer; variable frequency oscillator means for applying any one of several different frequencies to said mixer, whereby certain wavelengths of said radio frequency energy are selected; a counter for providing counts represented by output potential levels on counter output terminals; and scan-control means for preventing counting of said counter while said radio receiver is receiving electrical energy at one of said certain wavelengths; said variable frequency oscillator means including means for applying signals of said different frequencies to said mixer in response to corresponding counts of said counter; said pulse generator being electrically connected to said counter whereby said counter is counted by said pulse generator to cause variable frequency oscillator means to apply a series of different frequencies to said mixer in response to said output potential levels; said pulse generator including pulse means for applying a series of pulses of predetermined duration to at least some of said pulse-controlled circuits, which predetermined durations are less than the durations of certain of said output potential levels; said pulse-controlled circuits including a plurality of lamps; each of said lamps indicating a different one of certain of said selected frequencies, whereby said lamps are illuminated to indicate the frequency being scanned for a period of time shorter than the time said counter is at a corresponding stage; each of said lamps including first and second terminals; each of said first terminals being electrically connected to said pulse means for applying a series of pulses of predetermined durations to at least some of said pulsecontrolled circuits, whereby pulses having a duration less than the duration of certain of the output potential levels are applied to said first terminal of said certain of said lamps; each of said second terminals of said certain lamps being electrically connected to a different one of said counter output terminals, whereby a circuit is completed from the pulse means and a selected counter output terminal for said duration less than the duration of certain of the output potential levels.
Claim 2
Dependent Claim
453 words
A radio receiver comprising means for receiving radio frequency electrical energy and signal processing means for selecting certain wavelengths of said radio frequency electrical energy and for producing audio intelligence froM said wavelengths of radio frequency electrical energy, said signal processing means comprising: a plurality of pulse-controlled circuits for intermittent operation upon the application of electrical pulses; a pulse generator; means for connecting said pulse generator to certain of said plurality of pulse-controlled circuits during at least a portion of the operation of said radio receiver, whereby certain portions of said radio receiver operate intermittently so as to conserve power; variable tuning means for selecting certain wavelengths of said radio frequency electrical energy; said variable tuning means comprising at least one mixer; variable frequency oscillator means for applying any one of several different frequencies to said mixer, whereby certain wavelengths of said radio frequency energy are selected; a counter for providing counts represented by output potential levels on counter output terminals; and scan-control means for preventing counting of said counter while said radio receiver is receiving electrical energy at one of said certain wavelengths; said variable frequency oscillator means including means for applying signals of said different frequencies to said mixer in response to corresponding counts of said counter; said pulse generator being electrically connected to said counter whereby said counter is counted by said pulse generator to cause variable frequency oscillator means to apply a series of different frequencies to said mixer in response to said output potential levels; said pulse generator including pulse means for applying a series of pulses of predetermined duration to at least some of said pulse-controlled circuits, which predetermined durations are less than the durations of certain of said output potential levels; said pulse-controlled circuits including a plurality of lamps; each of said lamps indicating a different one of certain of said selected frequencies, whereby said lamps are illuminated to indicate the frequency being scanned for a period of time shorter than the time said counter is at a corresponding stage; each of said lamps including first and second terminals; each of said first terminals being electrically connected to said pulse means for applying a series of pulses of predetermined durations to at least some of said pulsecontrolled circuits, whereby pulses having a duration less than the duration of certain of the output potential levels are applied to said first terminal of said certain of said lamps; each of said second terminals of said certain lamps being electrically connected to a different one of said counter output terminals, whereby a circuit is completed from the pulse means and a selected counter output terminal for said duration less than the duration of certain of the output potential levels.
Claim 3
Dependent Claim
210 words
A radio receiver according to claim 1 in which said variable tuning means further includes: manual scanning means for selecting manual operation of said radio receiver; said manual means having its output electrically connected to said counter and its input electrically connected to said pulse generator; said manual means including manual-automatic switch means having a first position and a second position and push-button switch means having a first position and a second position; said manual means further including means for electrically disconnecting said pulse generator from said counter without disconnecting said pulse generator from at least certain of said pulse-controlled circuits while both said manual-automatic switch means and said push-button switch means are in said first position and electrically connecting said pulse generator to said counter when said manual-automatic switch means is in said second position and said radio receiver is not receiving electrical energy of any of said certain wavelengths, whereby said counter counts continuously while said manual-automatic switch means is in said second posItion and said radio is not receiving radio frequency energy at any of said certain wavelengths and counts only upon the switching of said push-button switch means to said first position from said second position while said manual-automatic switch means is in said second position.
Claim 4
Dependent Claim
38 words
A radio receiver according to claim 2 in which said push-button switch means includes means for applying a single pulse to said counter whenever said push-button switch means is switched from said first position to said second position.
Claim 5
Dependent Claim
69 words
A radio receiver according to claim 2 in which said push-button switch means includes means for applying pulses from said pulse generator to said counter at a slower repetition rate when said push-button switch means is in said second position and said manual-automatic switch means is in said first position than said manual means applies to said counter when said manual automatic switch means is in said second position.
Claim 6
Dependent Claim
182 words
A radio receiver according to claim 2 in combination with battery power means adapted to provide electrical power from a battery to the radio receiver in which: said certain pulse-controlled circuits include at least one or more of RF amplification stage, IF amplification stage and first and second mixers; said signal processing means further comprises an audio stage for amplifying audio signals; noise detector means for applying power from said battery power means to said audio stage, and one or more of said RF amplification stage, IF amplification stage and first and second mixers when a carrier is detected and for blocking power from said audio stage, and one or more of said RF amplification stage, IF amplification stage and first and second mixers in the absence of a detected carrier signal; said gate means for connecting including gate means for electrically connecting said pulse means to one or more of said RF amplification stage, IF amplification stage and first and seconnd mixers; and said pulse means includes the power source for at least one of the RF, IF and audio stages.
Claim 7
Dependent Claim
88 words
A radio receiver according to claim 5 in which: said signal processing means includes a discriminator having a first and second discriminator output means; said discriminator including means for energizing said first discriminator output means when a carrier signal is detected and said second discriminator output means when a carrier signal is not detected; said noise detector means being a bistable device having a set input terminal electrically connected to the first discriminator output means and a reset input terminal electrically connected to the second discriminator output means.
Claim 8
Dependent Claim
14 words
A radio receiver according to claim 1 in which said lamps are LED lamps.
Claim 9
Dependent Claim
182 words
A radio receiver according to claim 1 in combination with battery power means adapted to provide electrical power from a battery to the radio receiver in which: said certain pulse-controlled circuits include at least one or more of RF amplification stage, IF amplification stage and first and second mixers; said signal processing means further comprising an audio stage for amplifying audio signals; and noise detector means for applying power from said battery power means to said audio stage, and one or more of said RF amplification stage, IF amplification stage and first and second mixers when a carrier is detected and for blocking power from said audio stage, and one or more of said RF amplification stage, IF amplification stage and first and second mixers in the absence of a detected carrier signal; said means for connecting including gate means for electrically connecting said pulse means to one or more of said RF amplification stage, IF amplification stage and first and second mixers; and said pulse means includes the power source for at least one of the RF, IF and audio stages.
Claim 10
Dependent Claim
88 words
A radio receiver according to claim 8 in which: said signal processing means includes a discriminator having a first and second discriminator output means; said discriminator including means for energizing said first discriminator output means when a carrier signal is detected and said second discriminator output means when a carrier signal is not detected; said noise detector means being a bistable device having a set input terminal electrically connected to the first discriminator output means and a reset input terminal electrically connected to the second discriminator output means.
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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 |