47 C.F.R. § 25.208 Power flux density limits.
Title 47 - Telecommunication
(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 (c) In the 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 (d–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:
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: (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: Note to paragraph (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: Note to paragraph (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: Note to paragraph (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: Note to paragraph (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: Note to paragraph (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: Note to paragraph (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: Note to paragraph (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. (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 (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 (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 (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 (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 (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 (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&supcaret;2) in 4 kHz for all angles of arrival between 0 and 5 degrees above the horizontal plane; −144 dB (W/m&supcaret;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&supcaret;2) in 4 kHz and for all angles of arrival between 25 and 90 degrees above the horizontal plane. (2) −126 dB (W/m&supcaret;2) in 1 MHz for all angles of arrival between 0 and 5 degrees above the horizontal plane; −126 dB (W/m&supcaret;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&supcaret;2) in 1 MHz and for all angles of arrival between 25 and 90 degrees above the horizontal plane. [48 FR 40255, Sept. 6, 1983, as amended at 52 FR 45636, Dec. 1, 1987; 59 FR 53329, Oct. 21, 1994; 65 FR 54171, Sept. 7, 2000; 66 FR 10623, Feb. 16, 2001; 66 FR 63515, Dec. 7, 2001; 67 FR 17299, Apr. 10, 2002; 67 FR 46911, July 17, 2002; 68 FR 16448, Apr. 4, 2003; 68 FR 43946, July 25, 2003; 69 FR 31745, June 7, 2004; 69 FR 52207, Aug. 25, 2004; 70 FR 24725, May 11, 2005; 70 FR 46675, Aug. 10, 2005; 71 FR 35188, June 19, 2006]
Title 47: Telecommunication
PART 25—SATELLITE COMMUNICATIONS
Subpart C—Technical Standards
§ 25.208 Power flux density limits.
-115-X dB(W/m\2\÷MHz)......... for 0° [le] δ < 5°-115-X+((10+X)/20)(δ-5)dB(W/ for 5° [le] δ < m\2\÷MHz). 25°-105 dB(W/m\2\÷MHz)........... for 25° [le] δ < 90°
for n [le] 50............................ X = 0 (dB)for 50 < n [le] 288................... X = (5/119) (n - 50) (dB)for n > 288........................... X = (1/69) (n + 402) (dB)
Table 1G_Single-Entry EPFDdown Limits for Protection of 0.6, 1.2, 3 and 10 Meter GSO FSS Earth Station Antennas \1,2\---------------------------------------------------------------------------------------------------------------- Percentage of Single-entry time during Reference Reference antennaFrequency band (GHz) for International EPFDdown dB(W/ which EPFDdown bandwidth diameter and reference Allocations m\2\) level may not (kHz) radiation pattern \3\ be exceeded----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -175.4 0 60 cm, Region 2; 12.2-12.5 in Region 3; and -174 90 Recommendation 12.5-12.75 in Regions 1 and 3. -170.8 99 ITU-R S.1428. -165.3 99.73 -160.4 99.991 -160 99.997 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -181.9 0 1.2 m, Region 2; 12.2-12.5 in Region 3; and -178.4 99.5 Recommendation 12.5-12.75 in Regions 1 and 3. -173.4 99.74 ITU-R S.1428. -173 99.857 -164 99.954 -161.6 99.984 -161.4 99.991 -160.8 99.997 -160.5 99.997 -160 99.9993 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -190.45 0 3 m, Region 2; 12.2-12.5 in Region 3; and -189.45 90 Recommendation 12.5-12.75 in Regions 1 and 3. -187.45 99.5 ITU-R S.1428. -182.4 99.7 -182 99.855 -168 99.971 -164 99.988 -162 99.995 -160 99.999 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -195.45 0 10 m, Region 2; 12.2-12.5 in Region 3; and -195.45 99 Recommendation 12.5-12.75 in Regions 1 and 3. -190 99.65 ITU-R S.1428. -190 99.71 -172.5 99.99 -160 99.998 -160 100 40----------------------------------------------------------------------------------------------------------------\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.
Table 2G_Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes------------------------------------------------------------------------100% of the time EPFDdown dB(W/(m\2\/40 Latitude (North or South in kHz)) degrees)-------------------------------------------------------------------------160................................... 0 < [verbar] Latitude [verbar] [le] 57.5.-160 + 3.4 (57.5 - [verbar] Latitude 57.5 < [verbar] Latitude [verbar] )/4. [verbar] [le] 63.75-165.3................................. 63.75 [le] [verbar] Latitude [verbar]------------------------------------------------------------------------
Table 1H_Aggregate EPFDdown Limits for Protection of 0.6, 1.2, 3 and 10 Meter GSO FSS Earth Station Antennas \1\---------------------------------------------------------------------------------------------------------------- Percentage of Aggregate time during Reference Reference antennaFrequency band (GHz) for International EPFDdown dB(W/ which EPFDdown bandwidth diameter and reference Allocations m\2\) may not be (kHz) radiation pattern \2\ exceeded----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -170 0 60 cm, Region 2; 12.2-12.5 in Region 3; and -168.6 90 Recommendation 12.5-12.75 in Regions 1 and 3. -165.3 99 ITU-R S.1428. -160.4 99.97 -160 99.99 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -176.5 0 1.2 m, Region 2; 12.2-12.5 in Region 3; and -173 99.5 Recommendation 12.5-12.75 in Regions 1 and 3. -164 99.84 ITU-R S.1428. -161.6 99.945 -164.4 99.97 -160.8 99.99 -160.5 99.99 -160 99.9975 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -185 0 3 m, Region 2; 12.2-12.5 in Region 3; and -184 90 Recommendation 12.5-12.75 in Regions 1 and 3. -182 99.5 ITU-R S.1428. -168 99.9 -164 99.96 -162 99.982 -160 99.997 -160 100 40----------------------------------------------------------------------------------------------------------------10.7-11.7 in all Regions; 11.7-12.2 in -190 0 10 m, Region 2; 12.2-12.5 in Region 3; and -190 99 Recommendation 12.5-12.75 in Regions 1 and 3. -166 99.99 ITU-R S.1428. -160 99.998 -160 100 40----------------------------------------------------------------------------------------------------------------\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.
Table 2H_Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes------------------------------------------------------------------------100% of the time EPFDdown dB(W/(m\2\/40 Latitude (North or South in kHz)) degrees)-------------------------------------------------------------------------160................................... 0 < [verbar] Latitude [verbar] [le] 57.5-160 + 3.4 (57.5 - [verbar] Latitude 57.5 < [verbar] Latitude [verbar])/4. [verbar] [le] 63.75-165.3................................. 63.75 [le] [verbar] Latitude [verbar]------------------------------------------------------------------------
Additional Operational Limits on the EPFDdown Radiated by Non-GSO FSS Systems Into 3 m and 10 m GSO FSS Earth Station Antennas---------------------------------------------------------------------------------------------------------------- Percentage of time during EPFDdown dB(W/(m\2\/40 kHz)) which EPFDdown may not be Receive GSO earth station exceeded antenna 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----------------------------------------------------------------------------------------------------------------
Operational Limits to the EPFDdown Radiated by Non-GSO FSS Systems in Certain Frequency Bands\1\---------------------------------------------------------------------------------------------------------------- Percentage of time Receive GSO during Reference earth Orbital Frequency band (GHz) for International EPFDdown which bandwidth station inclination of allocations dB(W/m\2\) EPFDdown (kHz) antenna GSO satelite may not be diameter (degrees) exceeded \2\ (m)----------------------------------------------------------------------------------------------------------------Prior to 31 December 2005: 10.7-11.7 in -163 3 all Regions; 11.7-12.2 in Regions 2; 12.2- -166 6 12.5 in Region 3; and 12.5;-12.75 in -167.5 9 Regions 1 and 3.......................... -169.5 >=18 100 [le]2.5 40Prior to 31 December 2005: 10.7-11.7 in -160 3 all Regions; 11.7-12.2 in Region 2; 12.2- -163 6 12.5 in Region 3; and 12.5-12.75 in -164.5 9 Regions 1 and 3.......................... -166.5 >=18 100 >2.5 and 40 [le]4.5----------------------------------------------------------------------------------------------------------------From 31 December 2005: 10.7-11.7 in all -161.25 3 Regions; 11.7-12.2 in Region 2; 12.2-12.5 -164 6 in Region 3; and 12.5-12.75 in Regions 1 -165.5 9 and 3.................................... -167.5 >=18 100 [le]2.5 40----------------------------------------------------------------------------------------------------------------From 31 December 2005: 10.7-11.7 in all -158.25 3 Regions; 11.7-12.2 in Region 2; 12.2-12.5 -161 6 in Region 3; and 12.5-12.75 in Regions 1 -162.5 9 and 3.................................... -164.5 >=18 100 >2.5 and 40 [le]4.5--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\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.
Limits to the EPFDup Radiated by NGSO FSS Systems in Certain Frequency Bands---------------------------------------------------------------------------------------------------------------- Percentage of time during ReferenceFrequency band (GHz) for International EPFDup dB(W/ which bandwidth Reference antenna beamwidth and Allocations m\2\) EPFDup may (kHz) reference radiation pattern \1\ not be exceeded----------------------------------------------------------------------------------------------------------------12.5-12.75; 12.75-13.25; 13.75-14.5... -160 100 40 4° ITU-R S.672-4, Ls=-20----------------------------------------------------------------------------------------------------------------\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.
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\---------------------------------------------------------------------------------------------------------------- Percentage of time during Reference Reference antennaFrequency band (GHz) for international EPDF down dB(W/ which EPFDdown bandwidth diameter and reference allocations m\2\) level may not (kHz) radiation pattern \4\ be exceeded----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -165.841 0 40 30 cm 12.5-12.75 in Region 3; 12.2-12.7 in -165.541 25 Recommendation ITU-R Region 2. -164.041 96 BO.1443 Annex 1 -158.6 98.857 -158.6 99.429 -158.33 99.429 -158.33 99.429 10011.7-12.5 in Region 1; 1.7-12.2 and -175.441 0 40 45 cm 12.5-12.75 in Region 3; 12.2-12.7 in -172.441 66 Recommendation ITU-R Region 2. -169.441 97.75 BO.1443 Annex 1 -164 99.357 -160.75 99.809 -160 99.986 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -176.441 0 40 60 cm 12.5-12.75 in Region 3; 12.2-12.7 in -173.191 97.8 Recommendation ITU-R Region 2. -167.75 99.371 BO. 1443 Annex 1 -162 99.886 -161 99.943 -160.2 99.971 -160 99.997 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -178.94 0 40 90 cm 12.5-12.75 in Region 3; 12.2-12.7 in -178.44 33 Recommendation ITU-R Region 2. -176.44 98 BO.1443 Annex 1 -171 99.429 -165.5 99.714 -163 99.857 -161 99.943 -160 99.991 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -182.44 0 40 120 cm 12.5-12.75 in Region 3; 12.2-12.7 in -180.69 90 Recommendation ITU-R Region 2. -179.19 98.9 BO.1443 Annex 1 -178.44 98.9 -174.94 99.5 -173.75 99.68 -173 99.68 -169.5 99.85 -167.8 99.915 -164 99.94 -161.9 99.97 -161 99.99 -160.4 99.998 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -184.941 0 40 180 cm \3\ 12.5-12.75 in Region 3; 12.2-12.7 in -184.101 33 Recommendation ITU-R Region 2. -181.691 98.5 BO.1443 Annex 1 -176.25 99.571 -163.25 99.946 -161.5 99.974 -160.35 99.993 -160 99.999 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -187.441 0 40 240 cm \2\ 12.5-12.75 in Region 3; 12.2-12.7 in -186.341 33 Recommendation ITU-R Region 2. -183.441 99.25 BO.1443 Annex 1 -178 99.786 -161.4 99.957 -161.9 99.983 -160.5 99.994 -160 99.999 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 1.7-12.2 and -191.941 0 40 300 cm 12.5-12.75 in Region 3; 12.2-12.7 in -189.441 33 Recommendation ITU-R Region 2. -185.941 99.5 BO.1443 Annex 1 -180.5 99.857 -173 99.914 -167 99.951 -162 99.983 -160 99.991 -160 100----------------------------------------------------------------------------------------------------------------\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/(m\2\/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/(m\2\/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.
Table 2L_Single-Entry EPFDdown Limits Radiated By Non-GSO FSS Systems At Certain Latitudes------------------------------------------------------------------------100% of the time EPFDdown dB(W/(m\2\/40 Latitude (North or South in kHz)) degrees)-------------------------------------------------------------------------160.0................................. 0 [le] [verbar] Latitude [verbar] [le] 57.5-160.0 + 3.4 (57.5 - [verbar] Latitude 57.5 [le] [verbar] Latitude [verbar])/4. [verbar] [le] 63.75-165.3................................. 63.75 [le] [verbar] Latitude [verbar]------------------------------------------------------------------------
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\---------------------------------------------------------------------------------------------------------------- Percentage of time during Frequency band (GHz) for EPFDdown dB which Reference Reference antenna diameter, and international allocations (W/m\2\) EPFDdown bandwidth reference radiation pattern \4\ level may (kHz) not be exceeded----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -160.4 0 ........... 30 cm 12.5-12.75 in Region 3; 12.2-12.7 in -160.1 25 40 Recommendation ITU-R Region 2. -158.6 96 BO.1443 -158.6 98 Annex 1. -158.33 98 -158.33 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -170 0 ........... 45 cm 12.5-12.75 in Region 3; 12.2-12.7 in -167 66 40 Recommendation ITU-R Region 2. -164 97.75 BO.1443 -160.75 99.33 Annex 1. -160 99.95 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -171 0 ........... 60 cm 12.5-12.75 in Region 3; 12.2-12.7 in -168.75 90 40 Recommendation ITU-R Region 2. -167.75 97.8 BO.1443 -162 99.6 Annex 1. -161 99.8 -160.2 99.9 -160 99.99 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -173.75 0 ........... 90 cm 12.5-12.75 in Region 3; 12.2-12.7 in -173 33 40 Recommendation ITU-R Region 2. -171 98 BO.1443 -165.5 99.1 Annex 1. -163 99.5 -161 99.8 -160 99.97 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -177 0 ........... 120 cm 12.5-12.75 in Region 3; 12.2-12.7 in -175.25 90 40 Recommendation ITU-R Region 2. -173.75 98.9 BO.1443 -173 98.9 Annex 1. -169.5 99.5 -167.8 99.7 -164 99.82 -161.9 99.9 -161 99.965 -160.4 99.993 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -179.5 0 ........... 180 cm 12.5-12.75 in Region 3; 12.2-12.7 in -178.66 33 40 Recommendation ITU-R Region 2. -176.25 98.5 BO.1443 -163.25 99.81 Annex 1. -161.5 99.91 -160.35 99.975 -160 99.995 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -182 0 ........... 240 cm 12.5-12.75 in Region 3; 12.2-12.7 in -180.9 33 40 Recommendation ITU-R Region 2. -178 99.25 BO.1443 -164.4 99.85 Annex 1. -161.9 99.94 -160.5 99.98 -160 99.995 -160 100----------------------------------------------------------------------------------------------------------------11.7-12.5 in Region 1; 11.7-12.2 and -186.5 0 ........... 300 cm 12.5-12.75 in Region 3; 12.2-12.7 in -184 33 40 Recommendation ITU-R Region 2. -180.5 99.5 BO.1443 -173 99.7 Annex 1. -167 99.83 -162 99.94 -160 99.97 -160 100----------------------------------------------------------------------------------------------------------------\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/(m\2\/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/(m\2\/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.
Table 2M_Aggregate EPFDdown Limits Radiated by Non-GSO FSS Systems At Certain Latitudes------------------------------------------------------------------------ 00% of the time EPFDdown dB(W/(m\2\/40 Latitude (North or South in kHz)) degrees)------------------------------------------------------------------------160.0.................................. 0 [le] [verbar] Latitude [verbar] [le] 57.5.160.0 + 3.4 (57.5 - [verbar] Latitude 57.5 [le] [verbar] Latitude [verbar] )/4. [verbar] [le] 63.75.165.3.................................. 63.75 [le] [verbar] Latitude [verbar].------------------------------------------------------------------------
Table N_Limits of Power-Flux Density From Space Stations in the Band 6700-7075 MHz---------------------------------------------------------------------------------------------------------------- Limit in dB(W/m2) for angle of arrival (δ) above the horizontal plane Reference Frequency band ------------------------------------------------------------ bandwidth 0\0\-5\0\ 5\0\-25\0\ 25\0\-90\0\----------------------------------------------------------------------------------------------------------------6700-6825 MHz................... -137.............. -137 + 0.5(δ- -127.............. 1 MHz 5).6825-7075 MHz................... -154.............. -154 + 0.5(δ- 144............... 4 kHz and............... 5). and............... 1 MHz -134.............. and............... -124.............. -134 + 0.5(δ- 5).----------------------------------------------------------------------------------------------------------------
