TCAS/LocoTrol Digital Channelized RF Repeaters

Train Collision Avoidance System is widely known as TCAS is meant to provide mainly:

  • Movement authority with display of signal aspect in Loco;
  • Preventing trains to pass signal at danger;
  • Speed supervision.

TCAS shall consist of On-board, Station, Trackside & On-track equipments. A UHF full-duplex radio communication unit with hot stand-by along with its antenna equipped in each Loco to communicate with other TCAS units. A UHF full-duplex radio communication unit with hot stand-by along with its antenna equipped in Station to communicate with Loco TCAS units. RFID tags shall be fitted on point zones, near Signals & track in block section for giving Track Identification Number (TIN) information to loco TCAS, location correction, identifying signal by Loco TCAS & for direction determination in tunnels.

For goods trains, more locomotives are required to haul goods trains on the track with steep gradients. Due to limitation of coupler capacity, all the locomotives cannot be attached in front of the train. For such heavy haul operation on steep gradients, normally three or more locomotives are utilized in consist placed at the front, middle and rear of the train. A remote system "LocoTrol" for controlling locomotives placed in the train consist from the leading locomotive through a wireless link is, therefore, required.

Simultaneous repetition & execution of commands, given by “Lead” locomotive to “Remote” locomotive by a wireless link, such as traction, air/vacuum braking, dynamic braking or any other functions performed by the driver of the lead unit and duplicated (transmitted) in “Remote” units.

In some special scenarios, construction, hill or mountains will block the communication, especially in tunnels. To solve the communication between Loco and Station/IBS equipment, communication between Loco equipments, HELIOS® Critical Communication Off-Air Repeaters or Digital Optical Transport System is designed to extend the coverage of Railways Radio into Tunnels sections and Trackside areas blind to BTS coverage.

HELIOS® Digital Dual Band Repeater is a carrier-grade, consumer-friendly digital smart booster that maximizes a subscriber’s indoor wireless experience by eliminating in-building dead zones. It is really cost-effective and intelligent solution to solve the last mile coverage problem, which is adopting SDR (Software Define Radio) technology basis on FPGA & DSP (Digital Signal Processing) platform. It enables on-the-fly filter be changed / upgraded by software without expensive hardware upgrading.

  • Supports LocoTrol and TCAS Dual Band system
  • Supports upgrading filter parameters in case of frequency re-farming by software
  • SOC & embedded architecture enables to delivery significantly improving network coverage with very low power consumption
  • Better out of band rejection than analog SAW filter
  • Built-in RJ-45 interface for local control
  • Additional RJ-45 port for remote Web Browser GUI viewing via external ethernet or wireless modem
  • Built-in AGC & ALC function
  • Aluminum-alloy casing with IP67 protection and compact design with natural cooling
  • LocoTrol and TCAS separate TX and RX Donor Antennas required with a minimum of 80dB Isolation between them

Electrical Specification

Frequency Range: 406.500MHz / 406.250 MHz(Locotrol); 441.8MHz / 466.8MHz(TCAS)

Number of Filter: 1(Locotrol); 3(TCAS)

Filter Bandwidth: 25KHz

Max Composite Output Power: 27±2dBm/27±2dBm

Max Gain: Max 85±2dB

AGC Control Range: Min 25dB

Gain Control Range: 30dB (1dB Step)

VSWR: <1.5

Ripple in Band: Max ±1.5dB

In-Band IMD: ≤ -13dBm

Spurious Emissions: 9KHz-1GHz: Max -36dBm; 1GHz-12.75GHz: Max -30dBm

I/O Impedance: 50 ohm

Uplink Noise Figure: ≤ 6dB@ Max Gain

Group Time Delay: Max 30µS

MTBF: Min. 50000 hrs

Power Supply: AC220V (+/-15%), 50Hz (Dual Redundant Power Supply available)

Power Consumption: Max 180W

Remote Control: Additional RJ-45 Port to connect external Ethernet or wireless modem for Remote IP viewing

External and Antenna Connection

RF Connector: TX / RX separate (N-type Female)

Local Alarm Indications: LED alarm display

Local Control: Built-in RJ-45 port for Local Control (Web Browser GUI)

Mechanical Specification

Temperature Range: -25℃ to +55℃

Humidity Range: Max 95%

IP Rating: IP67

Dimensions: 499*399*225mm

Weight: Max 34kg