Goto Section: 25.212 | 25.214 | Table of Contents
FCC 25.213
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 25.213 Inter-Service coordination requirements for the 1.6/2.4 GHz
mobile-satellite service.
(a) Protection of the radio astronomy service in the 1610.6-1613.8 MHz
band against interference from 1.6/2.4 GHz Mobile-Satellite Service
systems.
(1) Protection zones. All 1.6/2.4 GHz Mobile Satellite Service systems
shall be capable of determining the position of the user transceivers
accessing the space segment through either internal radiodetermination
calculations or external sources such as LORAN-C or the Global
Positioning System. During periods of radio astronomy observations,
land mobile earth stations shall not operate when located within
geographic protection zones defined by the radio observatory
coordinates and separation distances as follows:
(i) In the band 1610.6-1613.8 MHz, within a 160 km radius of the
following radio astronomy sites:
Observatory Latitude (DMS) Longitude (DMS)
Arecibo, PR 18 20 46 66 45 11
Green Bank Telescope, WV 38 25 59 79 50 24
38 26 09 79 49 42
Very Large Array, NM 34 04 43 107 37 04
Owens Valley, CA 37 13 54 118 17 36
Ohio State, OH 40 15 06 83 02 54
(ii) In the band 1610.6-1613.8 MHz, within a 50 km radius of the
following sites:
Observatory Latitude (DMS) Longitude (DMS)
Pile Town, NM 34 18 04 108 07 07
Los Alamos, NM 35 46 30 106 14 42
Kitt Peak, AZ 31 57 22 111 36 42
Ft. Davis, TX 30 38 06 103 56 39
N. Liberty, IA 41 46 17 91 34 26
Brewster, WA 48 07 53 119 40 55
Owens Valley, CA 37 13 54 118 16 34
St. Croix, VI 17 45 31 64 35 03
Mauna Kea, HI 19 48 16 155 27 29
Hancock, NH 42 56 01 71 59 12
(iii) Out-of-band emissions of a mobile earth station licensed to
operate within the 1610.0-1626.5 MHz band shall be attenuated so that
the power flux density it produces in the 1610.6-1613.8 MHz band at any
radio astronomy site listed in paragraph (a)(1) (i) or (ii) of this
section shall not exceed the emissions of a mobile earth station
operating within the 1610.6-1613.8 MHz band at the edge of the
protection zone applicable for that site. As an alternative, a mobile
earth station shall not operate during radio astronomy observations
within the 1613.8-1615.8 MHz band within 100 km of the radio astronomy
sites listed in paragraph (a)(1)(i) of this section, and within 30 km
of the sites listed in paragraph (a)(1)(ii) of this section, there
being no restriction on a mobile earth station operating within the
1615.8-1626.5 MHz band.
(iv) For airborne mobile earth stations operating in the 1610.0-1626.5
MHz band, the separation distance shall be the larger of the distances
specified in paragraph (a)(1) (i), (ii) or (iii) of this section, as
applicable, or the distance, d, as given by the formula:
d (km) = 4.1 square root of (h)
where h is the altitude of the aircraft in meters above ground level.
(v) Smaller geographic protection zones may be used in lieu of the
areas specified in paragraphs (a)(1) (i), (ii), (iii), and (iv) of this
section if agreed to by the Mobile-Satellite Service licensee and the
Electromagnetic Spectrum Management Unit (ESMU), National Science
Foundation, Washington, D.C. upon a showing by the Mobile-Satellite
Service licensee that the operation of a mobile earth station will not
cause harmful interference to a radio astronomy observatory during
periods of observation.
(vi) The ESMU shall notify Mobile-Satellite Service space station
licensees authorized to operate mobile earth terminals in the
1610.0-1626.5 MHz band of periods of radio astronomy observations. The
mobile-satellite systems shall be capable of terminating operations
within the frequency bands and protection zones specified in paragraphs
(a)(1) (i) through (iv) of this section, as applicable, after the first
position fix of the mobile earth terminal either prior to transmission
or, based upon its location within the protection zone at the time of
initial transmission of the mobile earth terminal. Once the
mobile-satellite system determines that a mobile earth terminal is
located within an RAS protection zone, the mobile-satellite system
shall immediately initiate procedures to relocate the mobile earth
terminal operations to a non-RAS frequency.
(vii) A beacon-actuated protection zone may be used in lieu of fixed
protection zones in the 1610.6-1613.8 MHz band if a coordination
agreement is reached between a mobile-satellite system licensee and the
ESMU on the specifics of beacon operations.
(viii) Additional radio astronomy sites, not located within 100 miles
of the 100 most populous urbanized areas as defined by the United
States Census Bureau at the time, may be afforded similar protection
one year after notice to the mobile-satellite system licensees by
issuance of a public notice by the Commission.
(2) Mobile-Satellite Service space stations transmitting in the
1613.8-1626.5 MHz band shall take whatever steps necessary to avoid
causing harmful interference to the radio astronomy facilities listed
in paragraphs (a)(1)(i) and (ii) of this section during periods of
observation.
(3) Mobile-Satellite Service space stations operating in the
2483.5-2500 MHz frequency band shall limit spurious emission levels in
the 4990-5000 MHz band so as not to exceed -241 dB (W/m^2 /Hz) at the
surface of the Earth.
(4) The Radioastronomy Service shall avoid scheduling radio astronomy
observations during peak MSS/RDSS traffic periods to the greatest
extent practicable.
(b) If a Mobile-Satellite Service space station operator in the
2496-2500 MHz band intends to operate at powers levels that exceed the
PFD limits in § 25.208(v), or if actual operations routinely exceed
these PFD limits, we require the Mobile-Satellite Service operator to
receive approval from each operational BRS system in the affected
geographical region.
[ 59 FR 53329 , Oct. 21, 1994, as amended at 61 FR 9945 , Mar. 12, 1996;
67 FR 61816 , Oct. 2, 2002; 71 FR 35188 , June 19, 2006]
Goto Section: 25.212 | 25.214
Goto Year: 2010 |
2012
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