Tuning system for RF receiver
US4528698A · kind A · utility
13Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1983 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Dec 22, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system is disclosed for tuning a heterodyne receiver. The system preferably includes a voltage tunable preselector filter whose output is applied to a mixer, a voltage tunable injection filter for filtering a local oscillator signal and for applying the filtered signal to the mixer, and tuning control circuitry. The tuning control circuitry senses the power output from the injection filter and develops varying tuning voltages for tuning both filters until a peak output is developed by the injection filter, whereby the filters are tuned for heterodyning an incoming RF signal to a desired IF frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.