Goto Section: 25.207 | 25.209 | Table of Contents
FCC 25.208
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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/m^2 ÷ MHz) for 0° ≤δ <5°
−115−X + ((10 + X)/20)(δ−5)dB(W/m^2 ÷ MHz) for 5° ≤δ <25°
−105 dB(W/m^2 ÷ 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 50 288 X = (1/69) (n + 402) (dB)
(f) [Reserved]
(g) In the 10.7-11.7 GHz and 11.7-12.2 GHz bands, 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 International
Allocations Single-entry EPFDdown dB(W/m^2) Percentage of time during which
EPFDdown level may not be exceeded Reference bandwidth (kHz) Reference
antenna diameter and reference radiation pattern^3
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 0
90
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 0
99.5
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 0
90
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 0
99
99.65
99.71
99.99
99.998
100 40 10 m, Recommendation ITU-R S.1428.
^1In 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.
^2For 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.
^3The 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 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 10.7-11.7 GHz and 11.7-12.2 GHz bands, 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/m^2) Percentage of time during which EPFDdown may not be
exceeded Reference bandwidth (kHz) Reference antenna diameter and reference
radiation pattern^2
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 0
90
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 0
99.5
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 0
90
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 0
99
99.99
99.998
100 40 10 m, Recommendation ITU-R S.1428.
^1In 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.
^2The 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 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 10.7-11.7 GHz and 11.7-12.2 GHz bands, 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/(m^2/40 kHz)) Percentage of time during which EPFDdown may not
be exceeded Receive GSO earth station
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
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 10.7-11.7 GHz and 11.7-12.2 GHz bands, 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 Bands^1
Frequency band (GHz) for International allocations EPFDdown dB(W/m^2)
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)
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 3
6
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 3
6
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 3
6
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 3
6
9
≥18
>2.5 and ≤4.5
^1The 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.
^2For 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.
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 12.75-13.15 GHz, 13.2125-13.25 GHz and 13.75-14.5 GHz bands, 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/m^2)
Percentage of time during which EPFDup may not be exceeded Reference
bandwidth (kHz) Reference antenna beamwidth and reference radiation
pattern^1
12.5-12.75; 12.75-13.25; 13.75-14.5 −160 100 40 4°
ITU-R S.672-4,
Ls=−20
^1For 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.
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 11.7-12.2 GHz and 12.5-12.75 GHz bands in Region 3, 11.7-12.5 GHz
bands in Region 1, and 12.2-12.7 GHz band 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 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 EPDF down dB(W/m^2) Percentage of time during which EPFDdown
level may not be exceeded Reference bandwidth (kHz) Reference antenna
diameter and reference radiation pattern^4
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 0
25
96
98.857
99.429
99.429
99.429
100 40 30 cm
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 −175.441
−172.441
−169.441
−164
−160.75
−160
−160 0
66
97.75
99.357
99.809
99.986
100 40 45 cm
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 −176.441
−173.191
−167.75
−162
−161
−160.2
−160
−160 0
97.8
99.371
99.886
99.943
99.971
99.997
100 40 60 cm
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 −178.94
−178.44
−176.44
−171
−165.5
−163
−161
−160
−160 0
33
98
99.429
99.714
99.857
99.943
99.991
100 40 90 cm
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 −182.44
−180.69
−179.19
−178.44
−174.94
−173.75
−173
−169.5
−167.8
−164
−161.9
−161
−160.4
−160 0
90
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 cm
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 −184.941
−184.101
−181.691
−176.25
−163.25
−161.5
−160.35
−160
−160 0
33
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 0
33
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 0
33
99.5
99.857
99.914
99.951
99.983
99.991
100 40 300 cm
Recommendation ITU-R
BO.1443 Annex 1
^1For 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.
^2For 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.
^3For 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.
^4Under 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.
^5For 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 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 11.7-12.2 GHz and 12.5-12.75 GHz bands in Region 3, 11.7-12.5 GHz
bands in Region 1, and 12.2-12.7 GHz band 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/m^2)
Percentage of time during which EPFDdown level may not be exceeded Reference
bandwidth (kHz) Reference antenna diameter, and reference radiation
pattern^4
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 0
25
96
98
98
100
40 30 cm
Recommendation 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 0
66
97.75
99.33
99.95
100
40 45 cm
Recommendation 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 0
90
97.8
99.6
99.8
99.9
99.99
100
40 60 cm
Recommendation 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 0
33
98
99.1
99.5
99.8
99.97
100
40 90 cm
Recommendation 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 0
90
98.9
98.9
99.5
99.7
99.82
99.9
99.965
99.993
100
40 120 cm
Recommendation 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 0
33
98.5
99.81
99.91
99.975
99.995
100
40 180 cm
Recommendation 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 0
33
99.25
99.85
99.94
99.98
99.995
100
40 240 cm
Recommendation 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 0
33
99.5
99.7
99.83
99.94
99.97
100
40 300 cm
Recommendation ITU-R
BO.1443
Annex 1.
^1For 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.
^2For 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.
^3For 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.
^4Under 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.
^5For 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 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/m^2) 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 −154
and −154 + 0.5(δ−5)
and −144
and 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 40.0-40.5 GHz 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 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 and all methods of modulation must not exceed the regional power
flux density levels prescribed in paragraphs (w)(1) through (4) of this
section.
(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.
Note to paragraph (w): These limits pertain to the power flux-density that
would be obtained under assumed free-space propagation conditions.
[ 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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