Mobile radio system
US4317219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1980 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Jul 9, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/26
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radio system for communications transmission between transmitting/receiving stations moving along prescribed routes and stationary transmitting/receiving stations arranged along these routes at prescribed intervals and effective in both route directions, provides that the stationary stations of one route are connected by way of cable to a central transmitting/receiving station. A carrier signal generator is connected to that end of the cable which is farthest from the central transmitting/receiving station and an amplitude modulator is connected parallel at the locations along the cable provided for the input of signals and formed by the stationary transmitting/receiving stations, and are respectively connected by way of a transformer having a high transmission ratio. A demodulator having a threshold value circuit is inserted in the central transmitting/receiving station at the end of the cable. The radio system is of particular advantage in railway radio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.