FCC 25.208 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 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/m ^2 ) in any 4 kHz band for angles of arrival between 0 and 5
degrees above the horizontal plane;
−152+(δ−5)/2 dB(W/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 4 kHz band for angles of arrival between 0 and 5
degrees above the horizontal plane; −150 + (δ−5)/2 dB(W/m ^2 ) 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/m ^2 ) in any 4 kHz band for angles of
arrival between 25 and 90 degrees above the horizontal plane; or
(2) −126 dB(W/m ^2 ) in any 1 MHz band for angles of arrival between 0 and 5
degrees above the horizontal plane; −126 + (δ−5)/2 dB(W/m ^2 ) 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/m ^2 ) 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 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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 ° [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 °
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 [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)
(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 (EPFD[down]),
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 Met
er GSO FSS Earth Station Antennas
\1,2\
-------------------------------------------------------------------------------
---------------------------------
Percentage of
Single-entry time during Refe
rence Reference antenna
Frequency band (GHz) for International EPFDdown dB(W/ which EPFDdown band
width diameter and reference
Allocations m\2\) level may not (k
Hz) 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 Recomme
ndation
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 Recomme
ndation
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 Recomme
ndation
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 Recomme
ndation
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 s
hall 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 cur
ve on a plot which is linear in
decibels for the EPFD levels and logarithmic for the time percentages, with s
traight 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]
------------------------------------------------------------------------
Note to paragraph (g): These limits relate to the equivalent power flux
density, which would be obtained under free-space propagation conditions,
for all conditions and for all methods of modulation.
(h) In the frequency bands 10.7–11.7 GHz and 11.7–12.2 GHz, the aggregate
equivalent power-flux density in the space-to-Earth direction (EPFD[down]),
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 G
SO FSS Earth Station Antennas \1\
-------------------------------------------------------------------------------
---------------------------------
Percentage of
Aggregate time during Refe
rence Reference antenna
Frequency band (GHz) for International EPFDdown dB(W/ which EPFDdown band
width diameter and reference
Allocations m\2\) may not be (k
Hz) 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 Recomme
ndation
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 Recomme
ndation
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 Recomme
ndation
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 Recomme
ndation
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 1
H.
\2\ The earth station antenna reference patterns are to be used only for the ca
lculation 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]
------------------------------------------------------------------------
Note to paragraph (h): These limits relate to the equivalent power flux
density, which would be obtained under free-space propagation conditions,
for all conditions and for all methods of modulation.
(i) In the frequency bands 10.7–11.7 GHz and 11.7–12.2 GHz, the additional
operational equivalent power-flux density, in the space-to-Earth direction,
(additional operational EPFD[down]) 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
-------------------------------------------------------------------------------
---------------------------------
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.............................................. 99.9
4
-176.............................................. 99.9
7
-171.............................................. 99.9
8
-168.............................................. 99.98
4 3
-165.............................................. 99.99
3
-163.............................................. 99.99
9
-161.25........................................... 99.9997
5
¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨ ¨
-161.25........................................... 10
0
-185.............................................. 99.9
7
-183.............................................. 99.9
8
-179.............................................. 99.9
9
-175.............................................. 99.99
6
-171.............................................. 99.99
8 10
-168.............................................. 99.99
9
-166.............................................. 99.999
8
-166.............................................. 10
0
-------------------------------------------------------------------------------
---------------------------------
Note to paragraph (i): These limits relate to the equivalent power flux
density, which is obtained under free-space propagation conditions, for all
conditions and for all methods of modulation.
(j) In the frequency bands 10.7–11.7 GHz and 11.7–12.2 GHz, the operational
equivalent power-flux density, in the space-to-Earth direction, (operational
EPFD[down]) 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 C
ertain Frequency Bands\1\
-------------------------------------------------------------------------------
---------------------------------
Percentage
of time
Receive GSO
during Referenc
e earth Orbital
Frequency band (GHz) for International EPFDdown which bandwidt
h 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
40
Prior 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 shal
l 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 ar
e given by linear interpolation
using a linear scale for EPFDdown in decibels and a logarithmic scale for ant
enna 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 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,
(EPFD[up]) 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
-------------------------------------------------------------------------------
---------------------------------
Percentage
of time
during Reference
Frequency 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 i
n 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 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,
(EPFD[down]), 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\
-------------------------------------------------------------------------------
---------------------------------
Percentage of
time during Refe
rence Reference antenna
Frequency band (GHz) for international EPDF down dB(W/ which EPFDdown band
width diameter and reference
allocations m\2\) level may not (k
Hz) 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
100
11.7-12.5 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 sin
gle-entry limits shown in Table
1L, the limits in Table 2L shall also apply in the frequency band listed in T
able 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 locat
ions 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 w
ith 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 operation
al EPFDdown limit also applies.
\4\ Under the section reference pattern of Annex 1 to Recommendation ITU-R BO.1
443 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 cur
ve on a plot which is linear in
decibels for the EPFD levels and logarithmic for the time percentages, with s
traight 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]
------------------------------------------------------------------------
Note to paragraph (l): These limits relate to the equivalent power flux
density, which would be obtained under free-space propagation conditions,
for all conditions and for all methods of modulation.
(m) In the frequency bands 11.7–12.2 GHz and 12.5–12.75 GHz in Region 3,
11.7–12.5 GHz in Region 1 and 12.2–12.7 GHz in Region 2, the aggregate
equivalent power-flux density, in the space-to-Earth direction, (EPFD[down])
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, 18
0, 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 ........... 3
0 cm
12.5-12.75 in Region 3; 12.2-12.7 in -160.1 25 40 R
ecommendation ITU-R
Region 2. -158.6 96 B
O.1443
-158.6 98 A
nnex 1.
-158.33 98
-158.33 100
-------------------------------------------------------------------------------
---------------------------------
11.7-12.5 in Region 1; 11.7-12.2 and -170 0 ........... 4
5 cm
12.5-12.75 in Region 3; 12.2-12.7 in -167 66 40 R
ecommendation ITU-R
Region 2. -164 97.75 B
O.1443
-160.75 99.33 A
nnex 1.
-160 99.95
-160 100
-------------------------------------------------------------------------------
---------------------------------
11.7-12.5 in Region 1; 11.7-12.2 and -171 0 ........... 6
0 cm
12.5-12.75 in Region 3; 12.2-12.7 in -168.75 90 40 R
ecommendation ITU-R
Region 2. -167.75 97.8 B
O.1443
-162 99.6 A
nnex 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 ........... 9
0 cm
12.5-12.75 in Region 3; 12.2-12.7 in -173 33 40 R
ecommendation ITU-R
Region 2. -171 98 B
O.1443
-165.5 99.1 A
nnex 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 ........... 1
20 cm
12.5-12.75 in Region 3; 12.2-12.7 in -175.25 90 40 R
ecommendation ITU-R
Region 2. -173.75 98.9 B
O.1443
-173 98.9 A
nnex 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 ........... 1
80 cm
12.5-12.75 in Region 3; 12.2-12.7 in -178.66 33 40 R
ecommendation ITU-R
Region 2. -176.25 98.5 B
O.1443
-163.25 99.81 A
nnex 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 ........... 2
40 cm
12.5-12.75 in Region 3; 12.2-12.7 in -180.9 33 40 R
ecommendation ITU-R
Region 2. -178 99.25 B
O.1443
-164.4 99.85 A
nnex 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 ........... 3
00 cm
12.5-12.75 in Region 3; 12.2-12.7 in -184 33 40 R
ecommendation ITU-R
Region 2. -180.5 99.5 B
O.1443
-173 99.7 A
nnex 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 agg
regate 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 locat
ions 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 w
ith 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.1
443 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 cur
ve on a plot which is linear in
decibels for the EPFD levels and logarithmic for the time percentages, with s
traight 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].
------------------------------------------------------------------------
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
-------------------------------------------------------------------------------
---------------------------------
Limit in dB(W/m2) for angle of arrival (δ) ab
ove the
horizontal plane
Reference
Frequency band ----------------------------------------------
-------------- bandwidth
0\0\-5\0\ 5\0\-25\0\ 2
5\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).
-------------------------------------------------------------------------------
---------------------------------
(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/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 1 MHz band for angles of arrival between 0 and 5
degrees above the horizontal plane;
−115 + 0.5(−5) dB(W/m ^2 ) in any 1 MHz band for angles of arrival between 5
and 25 degrees above the horizontal plane;
−105 dB(W/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 1 MHz band for angles of arrival δ (in
degrees) between 20 and 25 degrees above the horizontal plane;
−117 dB(W/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 1 MHz band for angles of arrival δ (in
degrees) between 20 and 25 degrees above the horizontal plane;
−105 dB(W/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 1 MHz band for angles of arrival between 25 and 90
degrees above the horizontal plane.
Note to paragraph (r): The conditions under which satellites may exceed
these power flux-density limits for normal free space propagation described
in paragraph (q)(1) to compensate for the effects of rain fading are under
study and have therefore not yet been defined. Such conditions and the
extent to which these limits can be exceeded will be the subject of a
further rulemaking by the Commission on the satellite service rules.
(s) In the band 40.040.5 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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/m ^2 ) in any 1 MHz band for angles of arrival between 0 and 5
degrees above the horizontal plane;
−120 + (δ−5) dB(W/m ^2 ) 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/m ^2 ) 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/m ^2 ) 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&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]
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