Method for automatically searching for an RF station
US4367558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1980 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Dec 22, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J1/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of automatically searching for an RF carrier uses a synthesized frequency. The synthesized frequency is generated by a voltage controlled oscillator which is part of a phase locked loop. The phase locked loop has a programmable divider which is controlled by a phase locked loop controller. The phase locked loop controller receives inputs from a frequency discriminator which is a portion of an RF receiver which is receiving the RF signals. The search is accomplished by using a frequency sweep rather than searching for a carrier at allocated frequency positions. When the search is initiated, large frequency steps are taken until a carrier signal is passed up and then the steps are decreased in size and inversed until the carrier signal is encountered again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.