CFR > Title 47 - Telecommunication > CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION > SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES (Parts 80–101) > PART 101—FIXED MICROWAVE SERVICES > SUBPART O—Multiple Address Systems (§101.1301 to §101.1333) > 101.1333—Interference protection criteria.

101.1333—Interference protection criteria.

(a) Frequency coordination. All EA licensees are required to coordinate their frequency usage with co-channel adjacent area licensees and all other affected parties.
(b) EA licensees are prohibited from exceeding a signal strength of 40 dBµV/m at their service area boundaries, unless a higher signal strength is agreed to by all affected co-channel, adjacent area licensees.
(c) EA licensees are prohibited from exceeding a signal strength of 40 dBµV/m at incumbent licensees' 40.2 kilometer (25-mile) radius composite contour specified in § 101.1331(c).
(d) In general, licensees shall comply with the appropriate coordination agreements between the United States and Canada and the United States and Mexico concerning cross-border sharing and use of the applicable MAS frequencies.
(1) Canada—932.0-932.25 MHz and 941.0-941.25 MHz. (i) Within Lines A, B, C, and D, as defined in § 1.928(e) of this chapter, along the U.S./Canada border, U.S. stations operating in the 932.0-932.25 MHz and 941.0-941.25 MHz bands are on a secondary basis and may operate provided that they shall not transmit a power flux density (PFD) at the border greater than −100 dBW/m 2 nor −94 dBW/m 2, respectively. The U.S. has full use of the frequencies in these regions up to the border in the bands 932.25-932.50 MHz and 941.25-941.50 MHz, and Canadian stations may operate on a secondary basis provided they do not exceed the respective PFDs shown above. PFD can be determined using the following formula: PFD (dBW/m 2) = 10 log [EIRP/4π(D 2 ], where EIRP is in watts, D is in meters, and the power is relative to an isotropic radiator. The technical parameters are also limited by tables 1 and 2:
Table 1—Maximum Radiated Power
Class of station Band MHz Maximum EIRP Maximum ERP 1
Watts dBW Watts dBW
Master 941.0-941.5 1000 30 600 27.8
Fixed Remote and Master 932.0-932.5 50 17 30 14.8
1 Where ERP = EIRP/1.64.>
(ii) Maximum antenna height above average terrain for master stations operating at a maximum power shall not exceed 150 meters. Above 150 meters, the power of master stations shall be in accordance with following table:
Table 2—Antenna Height—Power Reduction Table
Antenna height above average terrain (meters) EIRP ERP
Watts dBW Watts dBW
Above 305 200 23 120 20.8
Above 275 to 305 250 24 150 21.8
Above 245 to 275 315 25 190 22.8
Above 215 to 245 400 26 240 23.8
Above 180 to 215 500 27 300 24.8
Above 150 to 180 630 28 380 25.8

Code of Federal Regulations

Note to Table 2: This information is from the Arrangement between the Federal Communications Commission and the National Telecommunications and Information Administration of the United States of America, and Industry Canada concerning the use of the bands 932 to 935 MHz and 941 to 944 MHz along the United States-Canada border signed in 1994. This agreement also lists grandfathered stations that must be protected.
(2) Canada—928-929 MHz and 952-960 MHz. Between Lines A and B and between Lines C and D, as defined in § 1.928(e) of this chapter, along the U.S./Canada border, U.S. stations operating in the 928.50-928.75 MHz and 952.50-952.75 MHz bands are on an unprotected basis and may operate provided that they shall not transmit a power flux density (PFD) at or beyond the border greater than −100 dBW/m 2. The U.S. has full use of the frequencies in these regions up to the border in the bands 928.25-928.50 MHz and 952.25-952.50 MHz, and Canadian stations may operate on an unprotected basis provided they do not exceed the PFD above. Frequencies in the bands 928.00-928.25 MHz, 928.75-929.00 MHz, 952.00-952.25 MHz, and 952.75-952.85 MHz are available for use on a coordinated, first-in-time, shared basis subject to protecting grandfathered stations. New stations must provide a minimum of 145 km (90 miles) separation or alternatively limit the actual PFD of the proposed station to −100 dBW/m 2, at the existing co-channel master stations of the other country, or as mutually agreed upon on a case-by-case basis. Coordination is not required if the PFD at the border is lower than −100 dBW/m 2. The technical criteria are also limited by the following:
Maximum EIRP for master stations in the MHz band: 1000 watts (30 dBW) 952-953
Maximum EIRP for fixed remote stations or stations in the 928-929 MHz band: 50 watts (17 dBW) master
Maximum EIRP for mobile master stations: 25 watts (14 dBW)
Maximum antenna height above average master or control stations: 152 m at 1000 watts terrain for EIRP, power derated in accordance with the following table:
Antenna height above average terrain (m) EIRP
Watts dBm
Above 305 200 53
Above 275 to 305 250 54
Above 244 to 274 315 55
Above 214 to 243 400 56
Above 183 to 213 500 57
Above 153 to 182 630 58
Below 152 1000 60

Code of Federal Regulations

Note to table in paragraph (d)(2): This information is from the Arrangement between the Department of Communications of Canada and the Federal Communications Commission of the United States of America Concerning the Use of the Bands 928 to 929 MHz and 952 to 953 MHz along the United States-Canada Border signed in 1991. This agreement also lists grandfathered stations that must be protected.
(3) Mexico. Within 113 kilometers of the U.S./Mexico border, U.S. stations operating in the 932.0-932.25 MHz and 941.0-941.25 MHz bands are on a secondary basis (non-interference to Mexican primary licensees) and may operate provided that they shall not transmit a power flux density (PFD) at or beyond the border greater than −100 dBW/m 2. Upon notification from the Commission, U.S. licensees must take proper measures to eliminate any harmful interference caused to Mexican primary assignments. The U.S. has full use of the frequencies in these regions up to the border in the bands 932.25-932.50 MHz and 941.25-941.50 MHz, and Mexican stations may operate on a secondary basis (non-interference to U.S. primary licensees) provided they do not exceed the PFD shown above. Stations using the 932-932.5 MHz band shall be limited to the maximum effective isotropic radiated power of 50 watts (17 dBW). Stations using the 941-941.5 MHz band shall meet the limits in the following table:
Antenna height above average mean sea level (meters) EIRP
Watts dBW
Above 305 200 23
Above 274 to 305 250 24
Above 243 to 274 315 25
Above 213 to 243 400 26
Above 182 to 213 500 27
Above 152 to 182 630 28
Up to 152 1000 30

Code of Federal Regulations

Note to table in paragraph (d)(3): This information is from the Agreement between the Government of the United States of America and the Government of the United Mexican States Concerning the Allocation and Use of Frequency Bands by Terrestrial Non-Broadcasting Radiocommunication Services Along the Common Border, Protocol #6 Concerning the Allotment and Use of Channels in the 932-932.5 and 941-941.5 MHz Bands for Fixed Point-to-Multipoint Services Along the Common Border signed in 1994.
[65 FR 17450, Apr. 3, 2000, as amended at 68 FR 4961, Jan. 31, 2003]