Frequency synthesized multichannel radio apparatus
US4688261A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1985 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Mar 4, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J5/0281
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency synthesized multichannel radio apparatus comprising a synthesized tranceiver and a remotely mountable control unit. All the possible channel frequencies available to users in a large geographical area are stored in a PROM mounted in the transceiver said PROM serving as a look-up table. The addresses of those channel frequencies in the PROM which are available to a particular user are stored in an electrically alterable storage means, such as an EAROM or a E.sup.2 PROM, contained in the control unit. In normal operation a channel selector in the control unit selects a particular channel in the electrically alterable storage means which in turn reads-out addresses of predetermined locations in the PROM which supplies data for example synthesizer divide numbers to the frequency synthesizer. If the channel frequencies available to a user have to be changed then with the apparatus remaining in situ a data transfer unit which has been preprogrammed with the addresses of the new channel frequencies is connected to the electrically alterable storage means and the new sequence of channel frequency addresses is stored therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.