US4660182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable multichannel sonobuoy transmitter
Assignee: United States Department of the Navy
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Filing: 1984-06-20
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Granted: 1987-04-21
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Expires: 2004-06-20
Abstract
Abstract A programmable phase-locked loop frequency synthesizer for a multi-channelonobuoy transmitter is disclosed. The phase-locked loop, including a counter/divider utilizing variable modulus prescaling techniques, is modulated at its voltage-controlled oscillator (VCO) by an external signal which is preemphasized by a compensation network in order to correct for the roll-off characteristic response of the loop below its natural frequency.
Inventors
- 👤 Albert M. Bates
- 👤 Wayne H. Sandford, Jr.
- 👤 Michael T. Junod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:33
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/193
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A programmable RF transmitter for transmitting data with frequencies from 10 to 20,000 hertz on any one of a plurality of channels comprising in combination: compensating means for receiving and preemphasizing a data signal as a function of its frequency and producing a preemphasized signal; first oscillator means for receiving a voltage signal, which voltage signal causes said oscillator means to oscillate at a carrier frequency, and for receiving the preemphasized signal, which preemphasized signal modulates the carrier frequency, said oscillator means producing an output signal indicative of the preemphasized signal; second oscillator means for producing a reference signal of constant frequency; detector means for receiving the reference signal for phase comparing with a second input signal thereto and producing the voltage signal to said first oscillator means; programming means receiving the output signal of said first oscillator means for dividing the frequency thereof and producing the second input of said detector means; and antenna means receiving the output of said first oscillator means; whereby a constant modulation sensitivity is maintained over the entire range of modulating frequencies.
Claim 2
Dependent Claim
178 words
A programmable RF transmitter for transmitting data with frequencies from 10 to 20,000 hertz on any one of a plurality of channels comprising in combination: compensating means for receiving and preemphasizing a data signal as a function of its frequency and producing a preemphasized signal; first oscillator means for receiving a voltage signal, which voltage signal causes said oscillator means to oscillate at a carrier frequency, and for receiving the preemphasized signal, which preemphasized signal modulates the carrier frequency, said oscillator means producing an output signal indicative of the preemphasized signal; second oscillator means for producing a reference signal of constant frequency; detector means for receiving the reference signal for phase comparing with a second input signal thereto and producing the voltage signal to said first oscillator means; programming means receiving the output signal of said first oscillator means for dividing the frequency thereof and producing the second input of said detector means; and antenna means receiving the output of said first oscillator means; whereby a constant modulation sensitivity is maintained over the entire range of modulating frequencies.
Claim 3
Dependent Claim
26 words
A programmable RF transmitter as in claim 1 wherein said compensating means comprises: a low-pass filter; and a differentiator connected in series with said low-pass filter.
Claim 4
Dependent Claim
37 words
A programmable RF transmitter according to claim 2, wherein said low-pass filter is configured to cutoff at ten hertz and said differentiator is operable in the range of 100 hertz to a cutoff frequency of 20,000 hertz.
References Cited (Backward Citations)
US3701088A
Cited
US3860874A
Cited
US4068198A
Cited
US4114110A
Cited
US4259744A
Cited
US4494090A
Cited
US4501019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |