47 CFR 25.208 - Power flux density limits.

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§ 25.208 Power flux density limits.
(a) In the band 3650-4200 MHz, the power flux density at the Earth's surface produced by emissions from a space station for all conditions and for all methods of modulation shall not exceed the following values:
−152 dB(W/m2) in any 4 kHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−152 (δ−5)/2 dB(W/m2) in any 4 kHz band for angles of arrival δ (in degrees) between 5 and 25 degrees above the horizontal plane; and
−142 dB(W/m2) in any 4 kHz band for angles of arrival between 25 and 90 degrees above the horizontal plane
These limits relate to the power flux density which would be obtained under assumed free-space propagation conditions.
(b) In the bands 10.95-11.2 and 11.45-11.7 GHz for GSO FSS space stations and 10.7-11.7 GHz for NGSO FSS space stations, the power flux-density at the Earth's surface produced by emissions from a space station for all conditions and for all methods of modulation shall not exceed the lower of the following values:
(1) −150 dB(W/m2) in any 4 kHz band for angles of arrival between 0 and 5 degrees above the horizontal plane; −150 (δ−5)/2 dB(W/m2) in any 4 kHz band for angles of arrival (δ) (in degrees) between 5 and 25 degrees above the horizontal plane; and −140 dB(W/m2) in any 4 kHz band for angles of arrival between 25 and 90 degrees above the horizontal plane; or
(2) −126 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane; −126 (δ−5)/2 dB(W/m2) in any 1 MHz band for angles of arrival (δ) (in degrees) between 5 and 25 degrees above the horizontal plane; and −116 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane.
Note to paragraph (b):
These limits relate to the power flux density, which would be obtained under assumed free-space propagation conditions.
(c) In the 17.7-17.8 GHz, 18.3-18.8 GHz, 19.3-19.7 GHz, 22.55-23.00 GHz, 23.00-23.55 GHz, and 24.45-24.75 GHz frequency bands, the power flux density at the Earth's surface produced by emissions from a space station for all conditions for all methods of modulation shall not exceed the following values:
(1) −115 dB (W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane.
(2) −115 0.5 (δ-5) dB (W/m2) in any 1 MHz band for angles of arrival d (in degrees) between 5 and 25 degrees above the horizontal plane.
(3) −105 dB (W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane.
(d) In addition to the limits specified in paragraph (c) of this section, the power flux-density across the 200 MHz band 18.6-18.8 GHz produced at the Earth's surface by emissions from a space station under assumed free-space propagation conditions shall not exceed −95 dB (W/m2) for all angles of arrival. This limit may be exceeded by up to 3 dB for no more than 5% of the time.
(e) In the 18.8-19.3 GHz frequency band, the power flux-density at the Earth's surface produced by emissions from a space station for all conditions and for all methods of modulation shall not exceed the following values:
−115−X dB(W/m2÷MHz) for 0° ≤ δ < 5°
−115−X ((10 X)/20)(δ−5)dB(W/m2÷MHz) for 5° ≤ δ < 25°
−105 dB(W/m2÷MHz) for 25° ≤ δ < 90°
Where:
δ: is the angle of arrival above the horizontal plane; and
X is defined as a function of the number of satellites in the non-GSO FSS constellation, n, as follows:
for n ≤ 50 X = 0 (dB)
for 50 < n ≤ 288 X = (5/119) (n − 50) (dB)
for n > 288 X = (1/69) (n 402) (dB)
(f) [Reserved]
(g) In the frequency bands 10.7-11.7 GHz and 11.7-12.2 GHz, the single-entry equivalent power-flux density in the space-to-Earth direction (EPFDdown), at any point on the Earth's surface, produced by emissions from all co-frequency space stations of a single non-geostationary-satellite orbit (NGSO) system operating in the fixed-satellite service (FSS) shall not exceed the following limits for the given percentages of time. Tables 1G and 2G follow:
Table 1G—Single-Entry EPFDdown Limits for Protection of 0.6, 1.2, 3 and 10 Meter GSO FSS Earth Station Antennas 1,2
Frequency band (GHz) for InternationalAllocations Single-entry EPFDdown dB(W/m2) Percentage of time during which EPFDdown level may not be exceeded Reference bandwidth (kHz) Reference antenna diameter and reference radiation pattern 3
1 In addition to the limits shown in Table 1G, the limits shown in Table 2G shall apply to all antenna sizes greater than 60 cm in the frequency bands listed in Table 1G.
2 For each reference antenna diameter, the limit consists of the complete curve on a plot which is linear in decibels for the EPFD levels and logarithmic for the time percentages, with straight lines joining the data points.
3 The earth station antenna reference radiation patterns are to be used only for the calculation of interference from NGSO FSS systems into GSO FSS systems.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −175.4−174 −170.8 −165.3 −160.4 −160 −160 090 99 99.73 99.991 99.997 100 40 60 cm, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −181.9−178.4 −173.4 −173 −164 −161.6 −161.4 −160.8 −160.5 −160 −160 099.5 99.74 99.857 99.954 99.984 99.991 99.997 99.997 99.9993 100 40 1.2 m, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −190.45−189.45 −187.45 −182.4 −182 −168 −164 −162 −160 −160 090 99.5 99.7 99.855 99.971 99.988 99.995 99.999 100 40 3 m, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −195.45−195.45 −190 −190 −172.5 −160 −160 099 99.65 99.71 99.99 99.998 100 40 10 m, Recommendation ITU-R S.1428.
Table 2G—Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes
100% of the time EPFDdown dB(W/(m2/40 kHz)) Latitude (North or South in degrees)
-160 0 < | Latitude | ≤ 57.5.
-160 3.4 (57.5 − | Latitude |)/4 57.5 < | Latitude | ≤ 63.75
-165.3 63.75 ≤ | Latitude |
Note to paragraph (g):
These limits relate to the equivalent power flux density, which would be obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(h) In the frequency bands 10.7-11.7 GHz and 11.7-12.2 GHz, the aggregate equivalent power-flux density in the space-to-Earth direction (EPFDdown), at any point on the Earth's surface, produced by emissions from all co-frequency space stations of all non-geostationary-satellite orbit systems operating in the fixed-satellite service (FSS) shall not exceed the following limits for the given percentages of time. Tables 1H and 2H follow:
Table 1H—Aggregate EPFDdown Limits for Protection of 0.6, 1.2, 3 and 10 Meter GSO FSS Earth Station Antennas 1
Frequency band (GHz) for International Allocations Aggregate EPFDdown dB(W/m2) Percentage of time during which EPFDdown may not beexceeded Reference bandwidth (kHz) Reference antenna diameter and reference radiation pattern 2
1 In addition to the limits shown in Table 1H, the aggregate EPFDdown limits shown in Table 2H shall apply to all antenna sizes greater than 60 cm in the frequency bands listed in Table 1H.
2 The earth station antenna reference patterns are to be used only for the calculation of interference from NGSO FSS systems into GSO FSS systems.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −170−168.6 −165.3 −160.4 −160 −160 090 99 99.97 99.99 100 40 60 cm, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −176.5−173 −164 −161.6 −164.4 −160.8 −160.5 −160 −160 099.5 99.84 99.945 99.97 99.99 99.99 99.9975 100 40 1.2 m, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −185−184 −182 −168 −164 −162 −160 −160 090 99.5 99.9 99.96 99.982 99.997 100 40 3 m, Recommendation ITU-R S.1428.
10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −190−190 −166 −160 −160 099 99.99 99.998 100 40 10 m, Recommendation ITU-R S.1428.
Table 2H—Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes
100% of the time EPFDdown dB(W/(m2/40 kHz)) Latitude (North or South in degrees)
-160 0 < | Latitude | ≤ 57.5
-160 3.4 (57.5 − | Latitude |)/4 57.5 < | Latitude | ≤ 63.75
-165.3 63.75 ≤ | Latitude |
Note to paragraph (h):
These limits relate to the equivalent power flux density, which would be obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(i) In the frequency bands 10.7-11.7 GHz and 11.7-12.2 GHz, the additional operational equivalent power-flux density, in the space-to-Earth direction, (additional operational EPFDdown) at any point on the Earth's surface, produced by actual operational emissions from all co-frequency space stations of a non-geostationary-satellite orbit (NGSO) system operating in the fixed-satellite service (FSS) shall not exceed the following operational limits for the given percentages of time:
Additional Operational Limits on the EPFDdown Radiated by Non-GSO FSS Systems Into 3 m and 10 m GSO FSS Earth Station Antennas
EPFDdown dB(W/(m2/40 kHz)) Percentage of time during which EPFDdown may not be exceeded Receive GSO earth stationantenna diameter (m)
−182 99.9
−179 99.94
−176 99.97
−171 99.98
−168 99.984 3
−165 99.993
−163 99.999
−161.25 99.99975
−161.25 100
−185 99.97
−183 99.98
−179 99.99
−175 99.996
−171 99.998 10
−168 99.999
−166 99.9998
−166 100
Note to paragraph (i):
These limits relate to the equivalent power flux density, which is obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(j) In the frequency bands 10.7-11.7 GHz and 11.7-12.2 GHz, the operational equivalent power-flux density, in the space-to-Earth direction, (operational EPFDdown) at any point on the Earth's surface, produced by actual operational emissions from the in-line co-frequency space station of a non-geostationary-satellite orbit (NGSO) system operating in the fixed-satellite service (FSS) shall not exceed the following operational limits for 100% of the time:
Operational Limits to the EPFDdown Radiated by Non-GSO FSS Systems in Certain Frequency Bands1
Frequency band (GHz) for International allocations EPFDdown dB(W/m2) Percentage of time during which EPFDdown may not be exceeded Reference bandwidth (kHz) Receive GSO earth station antenna diameter 2 (m) Orbital inclination of GSO satelite (degrees)
1 The operational limits on the EPFDdown radiated by non-GSO FSS systems shall be the values given in Table 2G or this table, whichever are the more stringent.
2 For antenna diameters between the values given in this table, the limits are given by linear interpolation using a linear scale for EPFDdown in decibels and a logarithmic scale for antenna diameter in meters.
Prior to 31 December 2005: 10.7-11.7 in all Regions; 11.7-12.2 in Regions 2; 12.2-12.5 in Region 3; and 12.5;-12.75 in Regions 1 and 3 −163−166 −167.5 −169.5 100 40 36 9 ≥18 ≤2.5
Prior to 31 December 2005: 10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −160−163 −164.5 −166.5 100 40 36 9 ≥18 >2.5 and ≤4.5
From 31 December 2005: 10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −161.25−164 −165.5 −167.5 100 40 36 9 ≥18 ≤2.5
From 31 December 2005: 10.7-11.7 in all Regions; 11.7-12.2 in Region 2; 12.2-12.5 in Region 3; and 12.5-12.75 in Regions 1 and 3 −158.25−161 −162.5 −164.5 100 40 36 9 ≥18 >2.5 and ≤4.5
Note to paragraph (j):
These limits relate to the operational equivalent power flux-density which would be obtained under free-space propagation conditions, for all conditions, for all methods of modulation and for the specified inclined GSO FSS operations.
(k) In the frequency bands 12.75-13.15 GHz, 13.2125-13.25 GHz and 13.75-14.5 GHz, the equivalent power flux-density, in the Earth-to-space direction, (EPFDup) produced at any point on the geostationary satellite orbit (GSO) by the emissions from all co-frequency earth stations in a non-geostationary satellite orbit fixed-satellite service (NGSO FSS) system, for all conditions and for all methods of modulation, shall not exceed the following limits for the specified percentages of time limits:
Limits to the EPFDup Radiated by NGSO FSS Systems in Certain Frequency Bands
Frequency band (GHz) for International Allocations EPFDup dB(W/m2) Percentage of time during which EPFDup may not be exceeded Reference bandwidth (kHz) Reference antenna beamwidth and reference radiation pattern 1
1 For the case of Ls = −10, the values a = 1.83 and b = 6.32 should be used in the equations in the Annex of Recommendation ITU-R S.672-4 for single-feed circular beams. In all cases of Ls, the parabolic main beam equation should start at zero.
12.5-12.75; 12.75-13.25; 13.75-14.5 −160 100 40 ITU-R S.672-4, Ls=−20
Note to paragraph (k):
These limits relate to the uplink equivalent power flux density, which would be obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(l) In the frequency bands 11.7-12.2 GHz and 12.5-12.75 GHz in Region 3, 11.7-12.5 GHz in Region 1 and 12.2-12.7 GHz in Region 2, the single-entry equivalent power-flux density, in the space-to-Earth direction, (EPFDdown), at any point on the Earth's surface, produced by emissions from all co-frequency space stations of a single non-geostationary-satellite orbit (NGSO) system operating in the fixed-satellite service (FSS) shall not exceed the following limits in Tables 1L and 2L for the given percentages of time:
Table 1L—Single-Entry EPFD Down Limits for Protection of 30, 45, 60, 90, 120, 180, 240 and 300 CM GSO BSS Earth Station Antennas 1,2,3,5
Frequency band (GHz) for internationalallocations EPDF down dB(W/m2) Percentage of time during which EPFDdown level may not be exceeded Reference bandwidth (kHz) Reference antenna diameter and reference radiation pattern 4
1 For BSS antenna diameters 180 cm, 240 cm and 300 cm, in addition to the single-entry limits shown in Table 1L, the limits in Table 2L shall also apply in the frequency band listed in Table 1L.
2 For 240 cm GSO BSS earth station antennas located in Alaska, communicating with GSO BSS satellites at the 91° W.L., 101° W.L., 110° W.L., 119° W.L. and 148° W.L. nominal orbital locations with elevation angles greater than 5°, −167 dB(W/(m2/40 kHz)) single-entry 100% of the time operational EPFDdown limit also applies to receive antennas.
3 For 180 cm GSO BSS earth station antennas located in Hawaii communicating with GSO BSS satellites that are operational as of December 30, 1999 at the 110° W.L., 119° W.L. and 148° W.L. nominal orbital positions, −162.5 dB(W/(m2/40 kHz)) single-entry 100% of the time operational EPFDdown limit also applies.
4 Under the section reference pattern of Annex 1 to Recommendation ITU-R BO.1443 shall be used only for the calculation of interference from non-GSO FSS systems into BSS systems.
5 For each reference antenna diameter, the limit consists of the complete curve on a plot which is linear in decibels for the EPFD levels and logarithmic for the time percentages, with straight line joining the data points.
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −165.841−165.541 −164.041 −158.6 −158.6 −158.33 −158.33 025 96 98.857 99.429 99.429 99.429 100 40 30 cmRecommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −175.441−172.441 −169.441 −164 −160.75 −160 −160 066 97.75 99.357 99.809 99.986 100 40 45 cmRecommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −176.441−173.191 −167.75 −162 −161 −160.2 −160 −160 097.8 99.371 99.886 99.943 99.971 99.997 100 40 60 cmRecommendation ITU-R BO. 1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −178.94−178.44 −176.44 −171 −165.5 −163 −161 −160 −160 033 98 99.429 99.714 99.857 99.943 99.991 100 40 90 cmRecommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −182.44−180.69 −179.19 −178.44 −174.94 −173.75 −173 −169.5 −167.8 −164 −161.9 −161 −160.4 −160 090 98.9 98.9 99.5 99.68 99.68 99.85 99.915 99.94 99.97 99.99 99.998 100 40 120 cmRecommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −184.941−184.101 −181.691 −176.25 −163.25 −161.5 −160.35 −160 −160 033 98.5 99.571 99.946 99.974 99.993 99.999 100 40 180 cm 3 Recommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −187.441−186.341 −183.441 −178 −161.4 −161.9 −160.5 −160 −160 033 99.25 99.786 99.957 99.983 99.994 99.999 100 40 240 cm 2 Recommendation ITU-R BO.1443 Annex 1
11.7-12.5 in Region 1; 1.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −191.941−189.441 −185.941 −180.5 −173 −167 −162 −160 −160 033 99.5 99.857 99.914 99.951 99.983 99.991 100 40 300 cmRecommendation ITU-R BO.1443 Annex 1
Table 2L—Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes
100% of the time EPFDdown dB(W/(m2/40 kHz)) Latitude (North or South in degrees)
−160.0 0 ≤ | Latitude | ≤ 57.5
−160.0 3.4 (57.5 − | Latitude |)/4 57.5 ≤ | Latitude | ≤ 63.75
−165.3 63.75 ≤ | Latitude |
Note to paragraph (l):
These limits relate to the equivalent power flux density, which would be obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(m) In the frequency bands 11.7-12.2 GHz and 12.5-12.75 GHz in Region 3, 11.7-12.5 GHz in Region 1 and 12.2-12.7 GHz in Region 2, the aggregate equivalent power-flux density, in the space-to-Earth direction, (EPFDdown) at any point on the Earth's surface, produced by emissions from all co-frequency space stations of all non-geostationary-satellite orbit systems operating in the fixed-satellite service (FSS) shall not exceed the following limits in Tables 1M and 2M for the given percentages of time:
Table 1M—Aggregate EPFDdown Limits for Protection of 30, 45, 60, 90, 120, 180, 240 and 300 cm GSO BSS Earth Station Antennas 1,2,3,5
Frequency band (GHz) for international allocations EPFDdown dB (W/m2) Percentage of time during which EPFDdown level may not be exceeded Reference bandwidth (kHz) Reference antenna diameter, and reference radiation pattern 4
1 For BSS antenna diameters 180 cm, 240 cm and 300 cm, in addition to the aggregate limit shown in Table 1M, the limits in Table 2M shall also apply.
2 For 240 cm GSO BSS earth station antennas located in Alaska, communicating with GSO BSS satellites at the 91° W.L., 101° W.L., 110° W.L., 119° W.L. and 148° W.L. nominal orbital locations with elevation angles greater than 5°, −167 dB(W/(m2/40 kHz)) aggregate 100% of the time operational EPFDdown limit also applies to receive antennas.
3 For 180 cm GSO BSS earth station antennas located in Hawaii communicating with GSO BSS satellites that are operational as of December 30, 1999 at the 110° W.L., 119° W.L. and 148° W.L. nominal orbital positions, −162.5 dB(W/(m2/40 kHz)) aggregate 100% of the time operational EPFDdown limit also applies.
4 Under the section reference pattern of Annex 1 to Recommendation ITU-R BO.1443 shall be used only for the calculation of interference from non-GSO FSS systems into GSO BSS systems.
5 For each reference antenna diameter, the limit consists of the complete curve on a plot which is linear in decibels for the EPFD levels and logarithmic for the time percentages, with straight line joining the data points.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −160.4−160.1 −158.6 −158.6 −158.33 −158.33 025 96 98 98 100 40 30 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −170−167 −164 −160.75 −160 −160 066 97.75 99.33 99.95 100 40 45 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −171−168.75 −167.75 −162 −161 −160.2 −160 −160 090 97.8 99.6 99.8 99.9 99.99 100 40 60 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −173.75−173 −171 −165.5 −163 −161 −160 −160 033 98 99.1 99.5 99.8 99.97 100 40 90 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −177−175.25 −173.75 −173 −169.5 −167.8 −164 −161.9 −161 −160.4 −160 090 98.9 98.9 99.5 99.7 99.82 99.9 99.965 99.993 100 40 120 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −179.5−178.66 −176.25 −163.25 −161.5 −160.35 −160 −160 033 98.5 99.81 99.91 99.975 99.995 100 40 180 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −182−180.9 −178 −164.4 −161.9 −160.5 −160 −160 033 99.25 99.85 99.94 99.98 99.995 100 40 240 cmRecommendation ITU-R BO.1443 Annex 1.
11.7-12.5 in Region 1; 11.7-12.2 and 12.5-12.75 in Region 3; 12.2-12.7 in Region 2 −186.5−184 −180.5 −173 −167 −162 −160 −160 033 99.5 99.7 99.83 99.94 99.97 100 40 300 cmRecommendation ITU-R BO.1443 Annex 1.
Table 2M—Aggregate EPFDdown Limits Radiated by Non-GSO FSS Systems At Certain Latitudes
00% of the time EPFDdown dB(W/(m2/40 kHz)) Latitude (North or South in degrees)
160.0 0 ≤ | Latitude | ≤ 57.5.
160.0 3.4 (57.5 − | Latitude |)/4 57.5 ≤ | Latitude | ≤ 63.75.
165.3 63.75 ≤ | Latitude |.
Note to paragraph (m):
These limits relate to the equivalent power flux density, which would be obtained under free-space propagation conditions, for all conditions and for all methods of modulation.
(n) The power-flux density at the Earth's surface produced by emissions from a space station in the fixed-satellite service (space-to-Earth), for all conditions and for all methods of modulation, shall not exceed the limits given in Table N. These limits relate to the power flux-density which would be obtained under assumed free-space conditions.
Table N—Limits of Power-Flux Density From Space Stations in the Band 6700-7075 MHz
Frequency band Limit in dB (W/m2) for angle of arrival (δ) above the horizontal plane Reference bandwidth
0°-5° 5°-25° 25°-90°
6700-6825 MHz −137 −137 0.5(δ−5) −127 1 MHz.
6825-7075 MHz −154and −154 0.5(δ−5)and −144and 4 kHz.
−134 −134 0.5(δ−5) −124 1 MHz.
(o) In the band 12.2-12.7 GHz, for NGSO FSS space stations, the specified low-angle power flux-density at the Earth's surface produced by emissions from a space station shall not be exceeded into an operational MVDDS receiver:
(1) −158 dB(W/m2) in any 4 kHz band for angles of arrival between 0 and 2 degrees above the horizontal plane; and
(2) −158 3.33(δ−2) dB(W/m2) in any 4 kHz band for angles of arrival (δ) (in degrees) between 2 and 5 degrees above the horizontal plane.
Note to paragraph (o):
These limits relate to the power flux density, which would be obtained under assumed free-space propagation conditions.
(p) The power flux-density at the Earth's surface produced by emissions from a space station in either the Earth exploration-satellite service in the band 25.5-27 GHz or the inter-satellite service in the band 25.25-27.5 GHz for all conditions and for all methods of modulation shall not exceed the following values:
−115 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−115 0.5(−5) dB(W/m2) in any 1 MHz band for angles of arrival between 5 and 25 degrees above the horizontal plane;
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane.
These limits relate to the power flux-density which would be obtained under assumed free-space propagation conditions.
(q) In the band 37.5-40.0 GHz, the power flux-density at the Earth's surface produced by emissions from a geostationary space station for all methods of modulation shall not exceed the following values.
(1) This limit relates to the power flux-density which would be obtained under assumed free space conditions (that is, when no allowance is made for propogation impairments such as rain-fade):
−139 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−139 4/3 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 20 degrees above the horizontal plane; and
−119 0.4 (δ−20) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 20 and 25 degrees above the horizontal plane;
−117 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane;
(2) This limit relates to the maximum power flux-density which would be obtained anywhere on the surface of the Earth during periods when FSS system raises power to compensate for rain-fade conditions at the FSS Earth station:
−127 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−127 4/3 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 20 degrees above the horizontal plane; and
−107 0.4 (δ−20) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 20 and 25 degrees above the horizontal plane;
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane.
Note to paragraph (q):
The conditions under which satellites may exceed the power flux-density limits for normal free space propagation described in paragraph (p)(1) to compensate for the effects of rain fading are under study and have therefore not yet been defined. Such conditions and the extent to which these limits can be exceeded will be the subject of a further rulemaking by the Commission on the satellite service rules.
(r) In the band 37.5-40.0 GHz, the power flux-density at the Earth's surface produced by emissions from a non-geostationary space station for all methods of modulation shall not exceed the following values:
(1) This limit relates to the power flux-density which would be obtained under assumed free space conditions (that is, when no allowance is made for propogation impairments such as rain-fade):
−132 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−132 0.75 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 25 degrees above the horizontal plane; and
−117 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane;
(2) This limit relates to the maximum power flux-density which would be obtained anywhere on the surface of the Earth during periods when FSS system raises power to compensate for rain-fade conditions at the FSS Earth station:
−120 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−120 0.75 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 25 degrees above the horizontal plane; and
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane.
Note to paragraph (r):
The conditions under which satellites may exceed these power flux-density limits for normal free space propagation described in paragraph (q)(1) to compensate for the effects of rain fading are under study and have therefore not yet been defined. Such conditions and the extent to which these limits can be exceeded will be the subject of a further rulemaking by the Commission on the satellite service rules.
(s) In the band 40.04 0.5 GHz, the power flux-density at the Earth's surface produced by emissions from a space station for all conditions and for all methods of modulation shall not exceed the following values:
−115 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−115 0.5 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 25 degrees above the horizontal plane; and
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane;
Note to paragraph (s):
These limits relate to the power flux-density that would be obtained under assumed free-space propagation conditions.
(t) In the band 40.5-42.0 GHz, the power flux density at the Earth's surface produced by emissions from a non-geostationary space station for all conditions and for all methods of modulation shall not exceed the following values:
−115 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−115 0.5 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 25 degrees above the horizontal plane; and
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane;
Note to paragraph (t):
These limits relate to the power flux density that would be obtained under assumed free-space propagation conditions.
(u) In the band 40.5-42.0 GHz, the power flux-density at the Earth's surface produced by emissions from a geostationary space station for all conditions and for all methods of modulation shall not exceed the following values:
−120 dB(W/m2) in any 1 MHz band for angles of arrival between 0 and 5 degrees above the horizontal plane;
−120 (δ−5) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 5 and 15 degrees above the horizontal plane;
−110 0.5 (δ−15) dB(W/m2) in any 1 MHz band for angles of arrival δ (in degrees) between 15 and 25 degrees above the horizontal plane; and
−105 dB(W/m2) in any 1 MHz band for angles of arrival between 25 and 90 degrees above the horizontal plane;
Note to paragraph (u):
These limits relate to the power flux-density that would be obtained under assumed free-space propagation conditions.
(v) In the band 2496-2500 MHz, the power flux-density at the Earth's surface produced by emissions from non-geostationary space stations for all conditions and all methods of modulation shall not exceed the following values (these values are obtained under assumed free-space propagation conditions):
(1) −144 dB (W/m^2) in 4 kHz for all angles of arrival between 0 and 5 degrees above the horizontal plane; −144 dB (W/m^2) 0.65(δ −5) in 4 kHz for all angles of arrival between 5 and 25 degrees above the horizontal plane; and
−131 dB (W/m^2) in 4 kHz and for all angles of arrival between 25 and 90 degrees above the horizontal plane.
(2) −126 dB (W/m^2) in 1 MHz for all angles of arrival between 0 and 5 degrees above the horizontal plane; −126 dB (W/m^2) 0.65(δ −5) in 1 MHz for all angles of arrival between 5 and 25 degrees above the horizontal plane; and
−113 dB (W/m^2) in 1 MHz and for all angles of arrival between 25 and 90 degrees above the horizontal plane.
(w) The power flux density at the Earth's surface produced by emissions from a 17/24 GHz BSS space station operating in the 17.3-17.7 GHz band for all conditions, including clear sky, and for all methods of modulation shall not exceed the regional power flux density levels defined below.
(1) In the region of the contiguous United States, located south of 38° North Latitude and east of 100 West Longitude: −115 dBW/m2/MHz.
(2) In the region of the contiguous United States, located north of 38° North Latitude and east of 100° West Longitude: −118 dBW/m2/MHz.
(3) In the region of the contiguous United States, located west of 100 West Longitude: −121 dBW/m2/MHz.
(4) For all regions outside of the contiguous United States including Alaska and Hawaii: −115 dBW/m2/MHz.
[48 FR 40255, Sept. 6, 1983]
Editorial Note:
For Federal Register citations affecting § 25.208, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.

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  • 2014-02-12; vol. 79 # 29 - Wednesday, February 12, 2014
    1. 79 FR 8308 - Comprehensive Review of Licensing and Operating Rules for Satellite Services
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    1. 79 FR 9445 - Proposal To Enable Operation of a Terrestrial Broadband Network in Certain Mobile Satellite Service Spectrum
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