Unit for reception ALSN signals

Unit for reception ALSN signals

Unit for reception ALSN signals

Unit for reception and registration of ALSN signals is used within advanced locomotive safety systems and provides for their versatility (possibility for the locomotive units to operate on the sites with radio-blocking as well as on the sites with ALSN).

Unit for reception and registration of ALSN signals provides the reception of amplitude-modulated signals according to one of three switchable channels with assigned frequencies of 25, 50 or 75 Hz with the following electrical parameters:

1) Threshold sensitivity at the frequency:

  • 25 Hz 55 – 70 mV;
  • 50 Hz (automatic traction). 90 – 110 mV;
  • 50 Hz (electric traction) 130 – 170 mV;
  • 75 Hz 150 – 200 mV;

2) Selectivity to adjacent channels (except for channel 75 Hz to carrier 25 Hz and channel 25 Hz to carrier 75 Hz) and to the harmonics of AC 50 Hz, not less than 40 dB;

3) Switching of channels on commands received via CAN–interface;

4) Value of the half bandwidth – not less than 7 Hz.

Realized projects:

  • During the period from 19.10.2012 till 03.06.2013 service testing of the unit for receipt, registration and deciphering of ALSN signals was arranged at the site of JSC “Lokomotiv”’s branch – Karaganda locomotive repair depot (Test sheet as of 19.10.2012).
  • On 03.06.2013 final acceptance of BPRS-ALS within Bombardier STM system was successfully passed at the site of Astana locomotive repair depot.

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