Patent US3808528A successfully refreshed from Google Patents.
US3808528A
Expired / Lapsed
US
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Modulation and noise analyzer
Assignee: Westinghouse Electric Corp
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Filing: 1972-09-25
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Granted: 1974-04-30
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Expires: 1992-09-25
Abstract
Abstract A system for analyzing an RF signal to determine the noise and modulation components of the signal is disclosed there. The system is capable of analyzing an unknown signal to determine the random AM, FM and PM noise components as well as the intentional AM, FM and PM modulation components. The system includes a phase lock loop through which controls the frequency of a signal which is mixed with the signal to be analyzed such that the resulting signal is within a frequency band which can be easily analyzed.
Inventors
- 👤 J Nugent
- 👤 H Claypool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:53
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
An analyzer for determining the noise and modulation components of an RF carrier comprising in combination: a. a first reference oscillator for generating a first microwave signal; b. a second voltage controlled oscillator for generating a first VHF signal; c. means for combining said first microwave signal with said first VHF signal to generate a second microwave signal having a predetermined frequency relationship to said first microwave and VHF signals; d. means for combining said second microwave signal with a third microwave signal to produce a second VHF Signal, said third microwave signal being a signal whose noise and modulation components are to be determined; e. means for generating a third VHF signal; f. means for combining said second VHF signal with a third VHF signal to produce a fourth signal; and g. means responsive to said fourth signal to generate a voltage signal, said voltage signal being coupled to said first VHF oscillator such that the frequency of said first oscillator is controlled such that the frequency components of said second VHF signal are within a predetermined frequency band and have a predetermined relationship to the carrier and modulation components of said third microwave signal.
Claim 2
Dependent Claim
196 words
An analyzer for determining the noise and modulation components of an RF carrier comprising in combination: a. a first reference oscillator for generating a first microwave signal; b. a second voltage controlled oscillator for generating a first VHF signal; c. means for combining said first microwave signal with said first VHF signal to generate a second microwave signal having a predetermined frequency relationship to said first microwave and VHF signals; d. means for combining said second microwave signal with a third microwave signal to produce a second VHF Signal, said third microwave signal being a signal whose noise and modulation components are to be determined; e. means for generating a third VHF signal; f. means for combining said second VHF signal with a third VHF signal to produce a fourth signal; and g. means responsive to said fourth signal to generate a voltage signal, said voltage signal being coupled to said first VHF oscillator such that the frequency of said first oscillator is controlled such that the frequency components of said second VHF signal are within a predetermined frequency band and have a predetermined relationship to the carrier and modulation components of said third microwave signal.
Claim 3
Dependent Claim
26 words
An analyzer in accordance with claim 1 wherein said means for combining said first microwave signal with said first VHF signal in a single sideband modulator.
Claim 4
Dependent Claim
21 words
An analyzer in accordance with claim 2 further including means for selecting the sideband to be used as an output signal.
Claim 5
Dependent Claim
25 words
An analyzer in accordance with claim 1 wherein said means for combining said second microwave signal with said third microwave signal comprises a microwave mixer.
Claim 6
Dependent Claim
37 words
An analyzer in accordance with claim 4 further including power dividing means coupled to the output of said microwave mixer with at least one output terminal of said microwave power divider being coupled to an AM detector.
Claim 7
Dependent Claim
25 words
An analyzer in accordance with claim 3 wherein said means for combining said second VHF signal with a third VHF signal is a phase detector.
Claim 8
Dependent Claim
22 words
An analyzer in accordance with claim 6 further including filter and signal analyzing means coupled to the output of said phase detector.
Claim 9
Dependent Claim
24 words
An analyzer in accordance with claim 7 wherein the output of said filter is coupled to the input terminal of said voltage controlled oscillator.
Claim 10
Dependent Claim
26 words
An analyzer in accordance with claim 8 wherein said signal analyzer means includes means for analyzing a carrier which is modulated with a plurality of subcarriers.
Claim 11
Dependent Claim
25 words
An analyzer in accordance with claim 9 wherein sais signal analyzing means includes means for individually analyzing the modulation components of said plurality of subcarriers.
References Cited (Backward Citations)
GB894003A
Cited
US3649909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |