Circuit for producing frequency-modulated signals
Abstract
Abstract FREQUENCY-MODULATED SIGNALS ARE PRODUCED BY A CIRCUIT HAVING FIRST AND SECOND RADIO-FREQUENCY AMPLIFIERS CONNECTED BY A LIMITER, THE OUTPUT OF THE SECOND RADIO-FREQUENCY AMPLIFIER IS CONNECTED TO A HYBRID COUPLER HAVING TWO OUTPUTS. ONE COUPLER OUTPUT IS CONNECTED THROUGH A VARIABLE PHASE-SHIFT CIRCUIT TO THE INPUT OF THE FIRST RADIOFREQUENCY AMPLIFIER TO PRODUCE OSCILLATIONS WHICH ARE FREQUENCY-MODULATED BY VARYING THE PHASE SHIFT IN RESPONSE TO AN APPLIED SIGNAL. THE FREQUENCY-MODULATED OSCILLATIONS HAVE A RELATIVELY WIDE DEVIATION AND A RELATIVELY HIGH DEVIATION RATE. THE OSCILLATIONS ARE DERIVED FROM THE OTHER OUTPUT OF THE DIRECTIONAL COUPLER FOR UTILIZATION IN ANY DESIRED MANNER.
Inventors
- 👤 John H Denny Jr
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |