US4258436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichannel RF signal generator
Assignee: United States Department of the Navy
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Filing: 1979-08-01
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Granted: 1981-03-24
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Expires: 1999-08-01
Abstract
Abstract A device for generating a plurality of RF signals, all possessing identicalodulation characteristics. A clock source triggers an oscillator to produce a precise pulse train that is filtered and fed to a first double balanced mixer for mixing with the output of a variable frequency oscillator. This output signal is then fed to a second double balanced mixer for mixing with additional modulation inputs which may be Am, FM, PSK and FSK.
Inventors
- 👤 Kenneth J. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A multichannel RF signal generator comprising: oscillatory pulse circuit means for providing a pulse train with a predetermined prf; low pass filter means connected to said circuit means for removing undesired high frequency components; first mixer circuit means having a first input coupled to the output of said filter and having a second input coupled to receive a variable frequency signal and having an output; and second mixer means having a first input coupled to the output of said first mixer means, a second input coupled to receive a variable amplitude signal and having an output signal spectrum comprising a plurality of identically modulated RF signals separated by a frequency spacing equal to the predetermined PRF; wherein the output of the second mixer means is substantially the output of the generator.
Claim 2
Dependent Claim
131 words
A multichannel RF signal generator comprising: oscillatory pulse circuit means for providing a pulse train with a predetermined prf; low pass filter means connected to said circuit means for removing undesired high frequency components; first mixer circuit means having a first input coupled to the output of said filter and having a second input coupled to receive a variable frequency signal and having an output; and second mixer means having a first input coupled to the output of said first mixer means, a second input coupled to receive a variable amplitude signal and having an output signal spectrum comprising a plurality of identically modulated RF signals separated by a frequency spacing equal to the predetermined PRF; wherein the output of the second mixer means is substantially the output of the generator.
Claim 3
Dependent Claim
19 words
The RF signal generator of claim 1 wherein said first and second mixer circuit means are double balanced mixers.
Claim 4
Dependent Claim
22 words
The RF signal generator of claim 2 wherein said second input to said first mixer circuit means is a voltage controlled oscillator.
Claim 5
Dependent Claim
18 words
The RF signal generator of claim 3 wherein said voltage controlled oscillator is controlled by frequency modulation signals.
Claim 6
Dependent Claim
47 words
The RF signal generator of claim 3 wherein said second mixer circuit means has the capability to vary the amplitude and phase of the output of said first mixer circuit means as a function of the signal applied to the second input of said second mixer circuit.
Claim 7
Dependent Claim
21 words
The RF signal generator of claim 3 wherein said voltage controlled oscillator is controlled by a frequency shift keyed modulated signal.
Claim 8
Dependent Claim
17 words
The RF signal generator of claim 1 wherein said variable amplitude signal is an amplitude modulated signal.
Claim 9
Dependent Claim
19 words
The RF signal generator of claim 1 wherein said variable amplitude signal is a double side band modulation signal.
Claim 10
Dependent Claim
19 words
The RF signal generator of claim 1 wherein said variable amplitude signal is a phase shift key modulation signal.
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |