Goto Section: 25.207 | 25.209 | Table of Contents
FCC 25.208
Revised as of October 1, 2013
Goto Year:2012 |
2014
§ 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+(d -5)/2 dB(W/m2 ) in any 4 kHz band for angles of arrival d (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 + (d -5)/2 dB(W/m2 ) in
any 4 kHz band for angles of arrival (d) (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 + (d -5)/2 dB(W/m2 ) in
any 1 MHz band for angles of arrival (d) (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 (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:
-115 -X dB(W/m^2-:MHz) for 0DEG <=d <5DEG
-115 -X+((10+X)/20)(d -5)dB(W/m^2-:MHz) for 5DEG <=d <25DEG
-105 dB(W/m^2-:MHz) for 25DEG <=d <90DEG
Where:
d: 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 EPFD[down]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 EPFD[down]dB(W/m^2) Percentage of time during
which EPFD[down]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.
^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 EPFD[down]Limits Radiated By Non-GSO FSS Systems
At Certain Latitudes
100% of the time EPFD[down]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 EPFD[down]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
EPFD[down]dB(W/m^2) Percentage of time during which EPFD[down]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.
^1 In addition to the limits shown in Table 1H, the aggregate
EPFD[down]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 EPFD[down]Limits Radiated By Non-GSO FSS Systems
At Certain Latitudes
100% of the time EPFD[down]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 EPFD[down]Radiated by Non-GSO FSS
Systems Into 3 m and 10 m GSO FSS Earth Station Antennas
EPFD[down]dB(W/(m^2/40 kHz)) Percentage of time during which
EPFD[down]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 EPFD[down]Radiated by Non-GSO FSS Systems in
Certain Frequency Bands ^1
Frequency band (GHz) for International allocations EPFD[down]dB(W/m^2)
Percentage of time during which EPFD[down]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
^1 The operational limits on the EPFD[down]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
EPFD[down]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 EPFD[up]Radiated by NGSO FSS Systems in Certain Frequency
Bands
Frequency band (GHz) for International Allocations EPFD[up]dB(W/m^2)
Percentage of time during which EPFD[up]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 4DEG
ITU-R S.672-4,
Ls= -20
^1 For the case of L[s]= -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 L[s], 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 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 international
allocations EPDF[down]dB(W/m^2) Percentage of time during which
EPFD[down]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
^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 91DEG W.L., 101DEG W.L.,
110DEG W.L., 119DEG W.L. and 148DEG W.L. nominal orbital locations with
elevation angles greater than 5DEG, -167 dB(W/(m^2/40 kHz))
single-entry 100% of the time operational EPFD[down]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 110DEG W.L., 119DEG W.L. and 148DEG W.L.
nominal orbital positions, -162.5 dB(W/(m^2/40 kHz)) single-entry 100%
of the time operational EPFD[down]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 EPFD[down]Limits Radiated By Non-GSO FSS Systems
At Certain Latitudes
100% of the time EPFD[down]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 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 international allocations EPFD[down]dB (W/m^2)
Percentage of time during which EPFD[down]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.
^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 91DEG W.L., 101DEG W.L.,
110DEG W.L., 119DEG W.L. and 148DEG W.L. nominal orbital locations with
elevation angles greater than 5DEG, -167 dB(W/(m^2/40 kHz)) aggregate
100% of the time operational EPFD[down]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 110DEG W.L., 119DEG W.L. and 148DEG W.L.
nominal orbital positions, -162.5 dB(W/(m^2/40 kHz)) aggregate 100% of
the time operational EPFD[down]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 EPFD[down]Limits Radiated by Non-GSO FSS Systems At
Certain Latitudes
00% of the time EPFD[down]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 (d) above the
horizontal plane Reference bandwidth
0^DEG-5^DEG 5^DEG-25^DEG 25^DEG-90^DEG
6700-6825 MHz -137 -137 + 0.5(d -5) -127 1 MHz.
6825-7075 MHz -154
and -154 + 0.5(d -5)
and -144
and 4 kHz.
-134 -134 + 0.5(d -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(d -2) dB(W/m2 ) in any 4 kHz band for angles of arrival
(d) (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 (d -5) dB(W/m2 ) in any 1 MHz band for angles of arrival d
(in degrees) between 5 and 20 degrees above the horizontal plane; and
-119 + 0.4 (d -20) dB(W/m2 ) in any 1 MHz band for angles of arrival d
(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 (d -5) dB(W/m2 ) in any 1 MHz band for angles of arrival d
(in degrees) between 5 and 20 degrees above the horizontal plane; and
-107 + 0.4 (d -20) dB(W/m2 ) in any 1 MHz band for angles of arrival d
(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 (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; 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 (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; 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 (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; 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 (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; 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 + (d -5) dB(W/m2 ) in any 1 MHz band for angles of arrival d (in
degrees) between 5 and 15 degrees above the horizontal plane;
-110 + 0.5 (d -15) dB(W/m2 ) in any 1 MHz band for angles of arrival d
(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(d -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(d -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
38DEG North Latitude and east of 100 West Longitude: -115 dBW/m2 /MHz.
(2) In the region of the contiguous United States, located north of
38DEG North Latitude and east of 100DEG 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 .
return arrow Back to Top
Goto Section: 25.207 | 25.209
Goto Year: 2012 |
2014
CiteFind - See documents on FCC website that
cite this rule
Want to support this service?
Thanks!
Report errors in
this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please
help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
hallikainen.com
Helping make public information public