Goto Section: 25.258 | 25.260 | Table of Contents
FCC 25.259
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 25.259 Time sharing between NOAA meteorological satellite systems and
non-voice, non-geostationary satellite systems in the 137-138 MHz band.
(a) The space stations of a non-voice, non-geostationary Mobile-Satellite
Service (NVNG MSS) system time-sharing downlink spectrum in the 137-138 MHz
band with National Oceanic and Atmospheric Administration (NOAA) satellites
shall not transmit signals into the “protection areas” of the NOAA
satellites.
(1) With respect to transmission in the 137.333-137.367 MHz, 137.485-137.515
MHz, 137.605-137.635 MHz, and 137.753-137.787 MHz bands, the protection area
for a NOAA satellite is the area on the Earth's surface in which the NOAA
satellite is in line of sight from the ground at an elevation angle of five
degrees or more above the horizon. No NVNG MSS satellite shall transmit in
these bands when it is in line of sight at an elevation angle of zero
degrees or more from any point on the ground within a NOAA satellite's
protected area for that band.
(2) With respect to transmission in the 137.025-137.175 MHz and 137.825-138
MHz bands, the protection area for a NOAA satellite is the area on the
Earth's surface in which the NOAA satellite is in line of sight from the
ground at any elevation angle above zero degrees. No NVNG MSS satellite
shall transmit in these bands when at a line-of-sight elevation angle of
zero degrees or more from any point on the ground within a NOAA satellite's
protected area for that band. In addition, such an NVNG MSS satellite shall
cease transmitting when it is at an elevation angle of less than zero
degrees from any such point, if reasonably necessary to protect reception of
the NOAA satellite's signal.
(3) An NVNG MSS licensee is responsible for obtaining the ephemeris data
necessary for compliance with these restrictions. The ephemeris information
must be updated system-wide on at least a weekly basis. For calculation
required for compliance with these restrictions an NVNG MSS licensee shall
use an orbital propagator algorithm with an accuracy equal to or greater
than the NORAD propagator used by NOAA.
(b) An NVNG licensee time sharing spectrum in the 137-138 MHz band must
establish a 24-hour per day contact person and telephone number so that
claims of harmful interference into NOAA earth stations and other
operational issues can be reported and resolved expeditiously. This contact
information must be made available to NOAA or its designee. If the NTIA
notifies the Commission that NOAA is receiving unacceptable interference
from a NVNG licensee, the Commission will require such NVNG licensee to
terminate its interfering operations immediately unless it demonstrates to
the Commission's reasonable satisfaction, and that of NTIA, that it is not
responsible for causing harmful interference into the worldwide NOAA system.
An NVNG licensee assumes the risk of any liability or damage that it and its
directors, officers, employees, affiliates, agents and subcontractors may
incur or suffer in connection with an interruption of its Mobile-Satellite
Service, in whole or in part, arising from or relating to its compliance or
noncompliance with the requirements of this paragraph.
(c) Each satellite in a NVNG licensee's system time-sharing spectrum with
NOAA in the 137-138 MHz band shall automatically turn off and cease
satellite transmissions if, after 72 consecutive hours, no reset signal is
received from the NVNG licensee's gateway earth station and verified by the
satellite. All satellites in such NVNG licensee's system shall be capable of
instantaneous shutdown on any sub-band upon command from such NVNG
licensee's gateway earth station.
[ 62 FR 59296 , Nov. 3, 1997, as amended at 78 FR 8430 , Feb. 6, 2013; 79 FR 8324 , Feb. 12, 2014]
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Goto Section: 25.258 | 25.260
Goto Year: 2014 |
2016
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