Radio Services Operating in the Band 4400-5000 MHz
Sharing Arrangement Between the Department of Communications of Canada and the National Telecommunications and Information Administration of the United States Concerning the Use of the Band 4400–5000 MHz
This sharing arrangement between the Department of Communications (DOC) of Canada and the National Telecommunications and Information Administration (NTIA) of the United States provides for the use and coordination of radio services in the band 4400–5000 MHz pending revision of the Agreement Between the Government of Canada and Government of the United States Concerning Coordination and Use of Radio Frequencies above 30 Megacycles per Second, Arrangement D.
2. The Use and Coordination of the Band 4400–5000 MHz: Fixed and Mobile Services
2.1 United States (U.S.) and Canadian terrestrial (excluding airborne) line of sight systems in the bands 4400–4460 MHz and 4540–4900 MHz will be coordinated in accordance with Arrangement D.
2.2 U.S. fixed, airborne, or other mobile systems operating in the bands 4460–4540 MHz and 4900–4990 MHz will not require coordination with Canada, except as specified in paragraph 2.5. Except for military usage as per paragraph 2.5, Canadian systems in these bands will be on an unprotected and non-interference basis to U.S. systems. However, information may be exchanged to determine the usage of these bands by fixed systems in Canada.
2.3 U.S. airborne or other mobile systems may use frequencies in the bands 4400–4460, 4540–4900 or 4990–5000 MHz if necessary. Canadian systems in these bands will be protected from such U.S. uses.
2.4 U.S. troposcatter systems operating in the band 4400–5000 MHz, except in the two sub-bands 4460–4540 MHz and 4900–4990 MHz, will be subject to coordination with Canada. The coordination zone is defined as the area within 500 km (300 miles) from the Canada/U.S. border.
2.5 In Canada, the bands 4460–4540 MHz and 4900–4990 MHz may be used by the Canadian Department of Defence for troposcatter links and mobile service. Usage of these bands by either country will be coordinated between the U.S./Canada military agencies according to Arrangement D.
Note: Eventually the arrangement referred to in 2.5 will be Arrangement C.
3. Use of the Band 4800–5000 MHz by the Radio Astronomy Service
3.1 The United States and Canada will provide protection to the Radio Astronomy Service in the band 4990–5000 MHz in accordance with note 795 of the ITU Radio Regulations.
3.2 Radio Astronomy has primary status in Canada in the bands 4825–4835 MHz and 4950–4990 MHz. Canada will notify the United States of the location and characteristics of Radio Astronomy stations operating in Canada in this frequency range, with the intent that every reasonable effort will be made to protect them from harmful interference in accordance with notes 778 and 794 of the ITU Radio Regulations.
Robert A. Gordon
Assistant Deputy Minister
Department of Communications
Alfred C. Sikes
The Assistant Secretary for
Communications and Information
United States Department of
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