WIRE-LESS CALL BOX SYSTEM TESTED

BRIEF DETAILS ARE GIVEN OF A USER-POWERED CALL BOX SYSTEM TRANSMITTING A RADIO SIGNAL TO A CONTROL CONSOLE AT A LOCAL POLICE HEADQUARTERS. DUBBED THE ADT HELP SYSTEM, EACH OF THE UNITS IS BATTERYLESS, WIRELESS RADIO TRANSMITTER, WHICH WHEN ACTIVATED EMITS A TONE CODED SIGNAL IN THE FREQUENCY RANGE 72-76 MEGAHERTZ. A BUILT-IN MANUAL POWER SOURCE DOES AWAY WITH POWER INPUT LINES OR BATTERY PACKS, BOTH OF WHICH REQUIRE REGULAR MAINTENANCE. MOTORISTS PULL DOWN THE HANDLE AND PRESS ONE OF FOUR BUTTONS MARKED "POLICE", "FIRE", "SERVICE", OR "AMBULANCE". BY DEPRESSING THE DOOR LEVER, THE MOTORIST ACTIVATES AN ALTERNATOR WHICH DEVELOPS AN ELECTRIC CHARGE AND STORES IT TEMPORARILY IN A POWER CELL MODULE. VISUAL EQUIPMENT ON THE RECEIVING CONSOLE INDICATES TO THE DUTY OFFICER THE LOCATION OF THE CALL BOX AND TYPE OF A ASSISTANCE REQUIRED.

• Publication Date: 1973-2

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 17
• Serial:
  • Highways Design and Construction
  • Volume: 41n1
  • Issue Number: n58

Subject/Index Terms

• TRT Terms: Call boxes (Driver aid devices); Equipment; Police; Transmission; Warning signs
• Old TRIS Terms: Call boxes; Emergency warning devices; Radio transmission
• Subject Areas: Highways; Safety and Human Factors; Security and Emergencies;

Filing Info

• Accession Number: 00224728
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: TRIS
• Created Date: May 15 1974 12:00AM