Goto Section: 87.477 | 87.481 | Table of Contents
FCC 87.479
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 87.479 Harmful interference to radionavigation land stations.
(a) Military or other Government stations have been authorized to establish
wide-band systems using frequency-hopping spread spectrum techniques in the
960-1215 MHz band. Authorization for a Joint Tactical Information
Distribution Systems (JTIDS) has been permitted on the basis of
non-interference to the established aeronautical radionavigation service in
this band. In order to accommodate the requirements for the system within
the band, restrictions are imposed. Transmissions will be automatically
prevented if:
(1) The frequency-hopping mode fails to distribute the JTIDS spectrum
uniformly across the band;
(2) The radiated pulse varies from the specified width of 6.4 microseconds
±5%;
(3) The energy radiated within ±7 MHz of 1030 and 1090 MHz exceeds a level
of 60 dB below the peak of the JTIDS spectrum as measured in a 300 kHz
bandwidth. The JTIDS will be prohibited from transmitting if the time slot
duty factor exceeds a 20 percent duty factor for any single user and a 40
percent composite duty factor for all JTIDS emitters in a geographic area.
(b) If radionavigation systems operating in the 960-1215 MHz band experience
interference or unexplained loss of equipment performance, the situation
must be reported immediately to the nearest office of the FAA, the National
Telecommunications and Information Administration, Washington, DC 20504, or
the nearest Federal Communications Commission field office. The following
information must be provided to the extent available:
(1) Name, call sign and category of station experiencing the interference;
(2) Date and time of occurrence;
(3) Geographical location at time of occurrence;
(4) Frequency interfered with;
(5) Nature of interference; and
(6) Other particulars.
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Goto Section: 87.477 | 87.481
Goto Year: 2014 |
2016
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