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Radio Control System for railcar movers

  • March 17, 2016

Work Area Alert System

When the operator energizes the transmitter, amber warning lights mounted on the cab roof and bodyframe railings illuminate. This serves as a warning to anyone in the area that the Trackmobile unit is about to move under radio control. It also signals the operator that positive communication between the transmitter and receiver has been established. A decal on the transmitter reminds the operator to remotely sound the air blast horn, and then when forward or reverse is selected, the amber warning lights begin to flash. Along with the Radio Control operator’s manual, the customer receives a quantity of high-visibility caution signs to display in the work area advising of a vehicle operating under radio control.

The Work Area Alert System also includes a visual train brake pressure indicator to assist the remote operator. Red lights are mounted on the cab roof and off-side railing. As the train air brake pipe pressure builds from 0 psi to approximately 60 the red lights are blinking, indicating that the pipe pressure is below the operating range. As pressure continues to build from 60 psi to 85 psi the lights are illuminated solid. When pipe pressure approaches 90 psi the lights go out. From then on, the red lights are visual indicators to the operator of the pipe pressure status: As the operator takes pressure reductions and pipe pressure drops below 90 psi the red lights illuminate solid. When pipe pressure drops below approximately 60 psi the red lights blink. The operator always has a visual indication of system pressure status.

As additional security, the Work Area Alert System has two Emergency Shutdown buttons, one on each side. When one of the buttons is activated

  • the transmission shifts to neutral
  • the engine is decelerated to idle
  • the train and service brakes are applied
  • the hydraulic functions are deactivated

Radio Transmitter

  • Environmentally sealed with replaceable and rechargeable battery
  • 3 paddle-controlled proportional outputs
Operator Inputs
  • Weatherproof toggle switches (up to 16 contacts)
  • Emergency STOP and ON buttons
Output Power 100 mW
Antenna Internal
Operating Range (minimum) 2500 ft (762m) line of sight
Battery 9.6v Makita tool battery, 1.2 Ahr
Battery Life, Continuous Use, Selectable Power-down modes 8 hours
Weight 6.3 lbs (2.8 kg)
Battery Charger 110 VAC or 12VDC input

Radio Receiver

Compact installation, entire transmitter is located inside cab instrument panel.


Frequency 902-928 MHz
Power Supply 10-30VDC
Sensitivity -110dBm
Selectivity 60dB, min
Antenna 5 inch (127mm) whip
External Indicators Three LED mounted LEDs (Power, Carrier, Link)
Internal Indicators Power LEDs plus output state and alarm LEDs per channel. Status information also available on terminal through RS232 port
Proportional Outputs 16 uni-directional PWM 33 or 100 Hz
Solid State Outputs 8 x 1Amp drivers
Relay Outputs 4 Form C 5Amp
Main Output 1 Form C 5 Amp (on when radio is on)
Protection, Solid State Outputs All outputs are current sourcing and protected for shorts to ground and supply over voltage, transients and thermal stress
Protection, Relay Outputs All outputs are fuse protected and equipped with transient protection

Radio System Specs

Frequency 902-908MHz
Channel Use Spread Spectrum
Modulation Digital FM (FSK) 9600 baud
Packets/second 48
Response Latency (type) 40 ms
Operating Range, maximum 2500 ft (762m) line of sight
ON/OFF channels with 1A solid state O/P 8 or 12
ON/OFF channels with 5A relay O/P 4
Proportional PWM channels 8 or 6
Proportional resolution 1% steps from 0 to 100%
  • Red latching mushroom emergency E-STOP button shuts down entire system, 1 mounted on each side of machine, 1 on transmitter
  • Hardware watchdog shuts down output for processor malfunction
  • Tilt switch in transmitter shuts system down
  • “Main” output activated only when valid data is received from correct transmitter and receivers
Operating Temperature -22®F to 131®F (-30®C to 55®C)
Storage Temperature -67®F to 185®F (-55®C to 85®C)
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