The MOST radio (radio modem) is designed for digital data exchange via radio channel in a simplex and (or) half-duplex mode.
The radio is connected to peripherals via RS-232 standard serial port. Power cables and antennas are connected to jacks on the modem rear panel. Metal housing ensures high level of protection against external disturbance. Transceiver and power modules are rigidly attached to one another.
The radio (radio modem) has a wide range of service functions that increase its performance characteristics: measurement and data output of input signal status, voltage standing-wave ratio of an antenna-feeder device, supply voltage, temperature inside the transmitter housing, etc.
| Modification | Configuration | Frequency band, MHz | Power supply votage, V | Weight, kg | Dimensions, mm |
|---|---|---|---|---|---|
| MOST-M/MOST-MM automobile version | PP-D/PP-М | 450—470/ 146—174 | 13.2 | 1.7 ±0.2 | 220x230x48 |
| MOST-М1/MOSТ-ММ1 locomotive version | PP-D/PP-М, BP 48/12 V | 48.0 | 4.1 ±0.3 | 280x240x97 | |
| MOST-S/МOST-SМ fixed version | PP-D/PP-М, BPS 220/12 V | 220.0 | 7.3 ±0.3 | 280x230x171 | |
| MOSТ-S1/МОSТ-SМ1 fixed version | PP-D/PP-М, BPS 220/12 V* | 220.0 | 7.3 ±0.3 | 360x230x171 | |
| МОSТ-L locomotive version | PP-ML, BP 48/12 V | 146—174 | 48.0 | 4.1 ±0.3 | 280x240x97 |
| МOSТ-V van version | PP-МV | 13.2 | 1.3 ±0.2 | 206x142x60 | |
| МОSТ-МL automobile version | PP-МL | 13.2 | 1.7 ±0.2 | 220x230x48 | |
| МОSТ-SL fixed version | PP-МL, BP 48/12 V | 220.0 | 7.3 ±0.3 | 280x230x171 | |
| МОSТ-SL1 fixed version | PP-МL, BPS 220/12 V* | 220.0 | 7.3 ±0.3 | 360x230x171 |
* — with the RS-232/RS-422 interface converter board
| Parameter | Value |
|---|---|
| Transceiver operation mode | simplex and (or) half-duplex |
| Frequency band: | |
| — «PP-М» | 146—174 МHz |
| — «PP-D» | 450—470 МHz |
| Data rate | 9600 bit/s |
| Minimum frequency spacing | 25 kHz |
| Transmitter output power | 5; 10; 20* W |
| Probability of invalid bits reception at 2 µV input and 9600 bit/s rate, (PP-М and PP-D), not worse than | 1х10-6 |
| Probability of invalid bits reception at 0.7-2 µV input and 9600 bit/s rate, (PP-МL and PP-MV), not worse than | 1х10-6 |
| Probability of data set delivery in noise free mode at 2 µV input and 9600 bit/s rate (PP-ML and PP-MV), not worse than | 0,9999 |
| Number of channels | up to 16 |
| Modulation | GMSK |
* — other 3 values can be programmed within 3—30 W
| Parameter | Value |
|---|---|
| Operating temperature range | –40…+60 °С |
| Storage temperature | –50…+70 °С |
| Time to failure | 40000 h |
| Average lifetime, up to | 15 years |
PP-3U transmitter
PP-3U transmitter is compatible with protocols of PP-ML transmitter but has smaller dimensions, mass, power consumption and the possibility of choosing communications interface.
МОSТ-3U radio modem
МОSТ-3U radiostation consisits of transmitter PP-3U and locomotive radio components supply unit, it is compatible with protocols of MOST-L radiostation.
