Radio receiver
US4672640A · kind A · utility
4Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Feb 27, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/1525
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio pager for receiving FSK signals has optimally narrow gaussian bandpass filters (F1, F2) and a phase lock loop (11, 12, 13, 14) for preventing local oscillator drift controlled in dependence of the derivation frequency (.+-.4.5 KHz) which is accurately controlled at the transmitter and which is derived from the decoder logic circuit (20). A significant increase in sensitivity is achieved over existing pagers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.