Automatic gain stabilization and calibration system for a radio receiver
Abstract
Abstract DISCLOSED IS AN AUTOMATIC GAIN STABILIZATION AND CALIBRATION SYSTEM FOR A RECEIVER A RECEIVER FOR MONITORING LOCAL OSCILLATOR SIGNALS FROM TELEVISION SETS IS PROVIDED WITH A DIRECTIONAL SWEEP ANTENNA AND A CALIBRATING ANTENNA. AS THE RADIATION PATTERN OF THE SWEEP ANTENNA PASSES OVER THE CALIBRATING ANTENNA, A CALIBRATING SIGNAL IS SET FROM THE LATTER TO THE FORMER. THIS SIGNAL IS AT THE FREQUENCY OF THE RECEIVER IF AND IS FIRST MIXED WITH A SWEEP OSCILLA- TOR IN THE RECEIVER. THE TRANSMITTED SIGNAL PASSES THROUGH THE RECEIVER AND IS COMPARED IN A SYNCHRONOUS DETECTOR WITH THE MODULATION ON THE UNMIXED CALIBRATING SIGNAL. ANY ERROR OUTPUT FROM THE SYNCHRONOUS DETECTOR IS USED TO CORRECT THE GAIN OF A RECEIVER AMPLIFIER.
Inventors
- 👤 Hansel B Mead
- 👤 Scott V Campbell
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |