AIRCRAFT COMMUNICATIONS INTERFERENCE TESTS

This report covers tests conducted to determine the possible causes of interference to aircraft very high frequency (vhf) voice communications resulting from transmissions from the vhf digital data link system operating onboard the same aircraft. Tests were conducted to determine aircraft vhf antenna isolation and vhf receiver response. The tests show that isolation depends on the physical positioning of the antennas on the airframe and that existing isolation (found to be as little as 23 dB) can realistically cause interference or quieting between transceivers even though they are operating at different frequencies up to 4 MHz apart. It was also found that transceiver design affects the rejection of undesired received signals. It was recommended that maximum isolation be maintained between aircraft antennas, receiver design be optimized for rejection of undesired signals, and cockpit communications discipline be used. (Author)

• Corporate Authors:

  NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER

  ATLANTIC CITY, NJ  United States 
• Authors:
  • Bernstein, J
• Publication Date: 1976-3

Media Info

• Pagination: 21 p.

Subject/Index Terms

• TRT Terms: Aircraft; Airframes; Antennas; Couplers; Data communications; Interference; Pulse modulation; Radio; Speech; Transmission; Very high frequency; Voice communication
• Uncontrolled Terms: Data links
• Old TRIS Terms: Aircraft antennas; Pulse communications; Radio interference; Radio transmission
• Subject Areas: Aviation; Vehicles and Equipment;

Filing Info

• Accession Number: 00133022
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FAA-NA-75-56
• Files: NTIS
• Created Date: Jun 23 2002 12:00AM