The TRS line radio system is a communication system interconnected with a vehicle safety system and the line operation control. The system ensures duplex connection between the engine driver, a station dispatcher and other persons involved in operation. The TRS system, working in the 450 MHz band, complies with the UIC 751-3 recommendations. It is operated along approximately 5,000 km of railways within the Czech Republic.
Basic characteristics
- Voice communication between the controller, station dispatcher, and engine driver
- Communication in the 450 MHz band at a pre-selected frequency quad consisting of A, B, C and D frequencies, where A, B, and C are transmission frequencies of basic radio stations and D is a vehicle radio station transmission frequency
- FFSK modulation for the transmission of telegrams and other digital and diagnostic information
- Auto-diagnostics of the whole system
Basic functions
- General selection of a controller or a station dispatcher for all mobile devices
- Emergency calls
- Identification transmission (a 6-digit train number)
- Selective locomotive calls (by means of a train number)
- Transmission of routine telegrams (command – report)
- Remote addressed STOP (by means of a train number)
- General STOP (stopping all trains on the line)
Radio station parameters
| HF signals | 450 MHZ |
| Operating mode | Duplex |
| Output power | 6 W/1.5 W/0.6 W |
| Receiver sensitivity | < 1μV |
| Modulation | 16 F3 |
| MTBF | 15,000 hours |
