US4047121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF signal generator
Assignee: United States Department of the Navy
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Filing: 1975-10-16
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Granted: 1977-09-06
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Expires: 1995-10-16
Abstract
Abstract An RF test signal generator including a driving oscillator, a pulse generr for generating narrow spikes at the oscillator frequency (such as a step recovery diode), a modulator and an attenuator. Since the very narrow pulse exhibits nearly constant amplitude in the frequency domain, a constant amplitude comb spectrum with frequency spacing at the oscillator frequency is generated so as to facilitate automated testing techniques.
Inventors
- 👤 Kenneth J. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:47
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03B; H03B19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
In a signal generator for generating modulated RF signals available for testing key parameters of receivers the combination comprising: (a) signal generating means for generating an output signal of a predetermined frequency; (b) pulse generating means coupled to said signal generating means for generating spike output pulses at said predetermined frequency; (c) balanced mixer modulator circuit means coupled to said pulse generator means; (d) a source of amplitude modulating signal means coupled to said modulator circuit means for modulating said narrow pulses to provide a plurality of RF signals at the output of said modulator circuit means.
Claim 2
Dependent Claim
97 words
In a signal generator for generating modulated RF signals available for testing key parameters of receivers the combination comprising: (a) signal generating means for generating an output signal of a predetermined frequency; (b) pulse generating means coupled to said signal generating means for generating spike output pulses at said predetermined frequency; (c) balanced mixer modulator circuit means coupled to said pulse generator means; (d) a source of amplitude modulating signal means coupled to said modulator circuit means for modulating said narrow pulses to provide a plurality of RF signals at the output of said modulator circuit means.
Claim 3
Dependent Claim
16 words
The signal generator of claim 1 wherein said pulsed generating means is a step recovery diode.
Claim 4
Dependent Claim
15 words
The signal generator of claim 1 wherein said signal generating means is a driving oscillator.
Claim 5
Dependent Claim
46 words
The signal generator of claim 3 wherein said pulse generating means is a step recovery diode pulsed generator coupled to said driving oscillator and being responsive to the output signal from said driving oscillator to generate very narrow pulses at the frequency of said driving oscillator.
Claim 6
Dependent Claim
31 words
The signal generator of claim 4 wherein said source of amplitude modulating signal means is a sine wave signal with a variable DC offset for adjusting the amount of carrier suppression.
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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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |