FREQUENCY SPECTRUM AVAILABILITY

THE ELECTROMAGNETIC SPECTRUM IS EXAMINED TO DETERMINE WHICH RADIO FREQUENCY BANDS MIGHT BE AVAILABLE FOR USE BY AN URBAN VEHICLE LOCATION AND COMMUNICATIONS SYSTEM. THESE SYSTEMS ARE UNDER DEVELOPMENT TO PROVIDE INSTANTANEOUS MONITORING OF FLEET OPERATIONS IN AN URBAN AREA. THEY EMPLOY AUTOMATIC DATA TRANSMISSION AND COMMUNICATIONS BETWEEN VEHICLES AND A CONTROL CENTER USING CONVENTIONAL RADIO FREQUENCIES. THE ENTIRE AVAILABLE SPECTRUM IS ANALYZED WITH REFERENCE TO FREQUENCY CATEGORIES, THE RESPECTIVE SERVICES ALLOCATED TO THEM (PRINCIPALLY MARINE COMMUNICATIONS AND A AIRCRAFT RADIONAVIGATION), SHARED PERCENTAGE, AND EQUIPMENT COMMONLY USED. BANDS PRESENTLY ASSIGNED TO COMMUNICATION SERVICES CANNOT BE USED BY AN L/C SYSTEM BECAUSE OF OVERCROWDING AND POTENTIAL INTERFERENCE. THE AVAILABILITY OF FREQUENCIES IN THE 400-1525 MHZ RANGE WHICH ARE CURRENTLY ALLOCATED TO RADIONAVIGATION SERVICES IS DISCUSSED. THESE SERVICES INCLUDE EXISTING LAND MOBILE COMMUNICATIONS WHICH COMPRISE APPROXIMATELY 1/3 OF THE TRANSMITTERS AUTHORIZED TO DATE. A NARROW REGION BETWEEN 450 AND 470 MHZ IS THE ONLY ONE AVAILABLE FOR NON-GOVERNMENT MOBILE SERVICES. ALTHOUGH A LIKELY CHOICE FOR USE BY L/C SYSTEMS AND ATTRACTIVE FOR APPLICATIONS OF EXISTING HARDWARE, IT IS RAPIDLY BECOMING OVERCROWDED. HEARINGS CONDUCTED BY RESPONSIBLE CONGRESSIONAL COMMITTEES AND RELEVANT DOCKETS OF THE FEDERAL COMMUNICATIONS COMMISSION PERTAINING TO THE REALLOCATION OF THIS RANGE FOR MOBILE AND OTHER USERS ARE DESCRIBED. THE REPORT INVESTIGATES THE APPLICABILITY OF SEVERAL ALTERNATIVE SERVICE ALLOCATIONS TO DETERMINE WHETHER L/C OPERATIONS COULD QUALIFY. /UMTA/

• Supplemental Notes:
  • PROJ NO MD-MTD-4
• Corporate Authors:

  IIT Research Institute

  10 West 35th Street
  Chicago, IL  United States  60616
• Publication Date: 1969-12

Subject/Index Terms

• TRT Terms: Automatic vehicle monitoring; Communication systems; Equipment; Frequency (Electromagnetism); Monitoring; Politics; Radio; Radio transmitters; Spectrum analysis; Urban areas
• Uncontrolled Terms: Monitors
• Old TRIS Terms: Governmental processes
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226482
• Record Type: Publication
• Source Agency: Urban Mass Transportation Administration
• Files: TRIS, USDOT
• Created Date: Nov 7 1972 12:00AM