The FM Tokenless Transmitter & Receiver is a safety-critical railway signaling system
designed for reliable tokenless block working. It operates on a nominal 24V DC supply and ensures
secure communication between railway stations using precision frequency modulation technology.
The transmitter and receiver units are engineered to work efficiently under varying environmental
conditions and provide stable operation with carrier frequencies of 1800 Hz and
2700 Hz.
Product Model
| Type |
Transmitter Frequency |
Receiver Frequency |
| 1800 Type |
1800 Hz |
1800 Hz |
| 2700 Type |
2700 Hz |
2700 Hz |
Transmitter Specifications
| Item |
Rating |
Remarks |
| Transmission Frequency |
1800 Hz or 2700 Hz |
±2% |
| Transmission Output |
1 mW, 3 mW, 5 mW (Adjustable) |
±10%, -5% |
| Output Impedance |
600 Ohm / 1120 Ohm (Adjustable) |
±10% |
| Modulation System |
Frequency Modulation |
- |
| Modulation Frequency |
65 Hz or 85 Hz |
±1.5 Hz |
| Power Consumption |
1.2 Watt or Less |
At 24V DC |
| Input Power Supply |
24V DC |
±20% |
| Shift Frequency |
160 Hz |
±15% |
Receiver Specifications
| Item |
Rating |
Remarks |
| Receiving Frequency |
1800 Hz or 2700 Hz |
±2% |
| Level Range |
1 to 28 dB |
In steps of 2dB or less |
| Input Impedance |
600 Ohm, 1120 Ohm adjustable |
±10 % |
| Relay output voltage |
24V DC or above |
21V Min. |
| Power Consumption |
8 Watt or less |
At 24V DC |
| Input Power Supply |
24V DC |
±20 % |
| Sense level for Receiving |
More than -19 dBm |
- |
| No sense level for receiving |
Less than -22 dBm |
- |
Applications
- Railway Signaling Systems
Environmental Conditions
- Operating Temperature: -40°C to +75°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 90% (Non-condensing)