Goto Section: 25.259 | 25.261 | Table of Contents
Revised as of November 24, 2020
Goto Year:2020 |
§ 25.260 Time sharing between DoD meteorological satellite systems and
non-voice, non-geostationary satellite systems in the 400.15-401 MHz band.
(a) The space stations of a non-voice, non-geostationary
Mobile-Satellite Service (NVNG MSS) system time-sharing downlink
spectrum in the 400.15-401.0 MHz band with Department of Defense (DoD)
satellites shall not transmit signals into the “protection areas” of
the DoD satellites.
(1) The protection area for such a DoD satellite is the area on the
Earth's surface in which the DoD satellite is in line of sight from the
ground at an elevation angle of five degrees or more above the horizon.
(2) An NVNG MSS space station shall not transmit in the 400.15-401 MHz
band when at a line-of-sight elevation angle of zero degrees or more
from any point on the ground within the protected area of a DoD
satellite operating in that band.
(3) An NVNG MSS licensee is responsible for obtaining the ephemeris
data necessary for compliance with this restriction. The ephemeris
information must be updated system-wide at least once per week. For
calculation required for compliance with this restriction an NVNG MSS
licensee shall use an orbital propagator algorithm with an accuracy
equal to or greater than the NORAD propagator used by DoD.
(b) An NVNG licensee time sharing spectrum in the 400.15-401 MHz band
must establish a 24-hour per day contact person and telephone number so
that claims of harmful interference into DoD earth stations and other
operational issues can be reported and resolved expeditiously. This
contact information must be made available to DoD or its designee. If
the NTIA notifies the Commission that DoD 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 DoD system. A 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 DoD in the 400.15-401 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.
(d) Initially, a NVNG licensee time-sharing spectrum with DoD in the
400.15-401 MHz band shall be able to change the frequency on which its
system satellites are operating within 125 minutes of receiving
notification from a DoD required frequency change in the 400.15-401 MHz
band. Thereafter, when a NVNG licensee constructs additional gateway
earth stations located outside of North and South America, it shall use
its best efforts to decrease to 90 minutes the time required to
implement a DoD required frequency change. A NVNG licensee promptly
shall notify the Commission and NTIA of any decrease in the time it
requires to implement a DoD required frequency change.
(e) Once a NVNG licensee time-sharing spectrum with DoD in the
400.15-401 MHz band demonstrates to DoD that it is capable of
implementing a DoD required frequency change within the time required
under paragraph (d) of this section, thereafter, such NVNG licensee
shall demonstrate its capability to implement a DoD required frequency
change only once per year at the instruction of DoD. Such
demonstrations shall occur during off-peak hours, as determined by the
NVNG licensee, unless otherwise agreed by the NVNG licensee and DoD.
Such NVNG licensee will coordinate with DoD in establishing a plan for
such a demonstration. In the event that a NVNG licensee fails to
demonstrate to DoD that it is capable of implementing a DoD required
frequency change in accordance with a demonstration plan established by
DoD and the NVNG licensee, upon the Commission's receipt of a written
notification from NTIA describing such failure, the Commission shall
impose additional conditions or requirements on the NVNG licensee's
authorization as may be necessary to protect DoD operations in the
400.15-401 MHz downlink band until the Commission is notified by NTIA
that the NVNG licensee has successfully demonstrated its ability to
implement a DoD required frequency change. Such additional conditions
or requirements may include, but are not limited to, requiring such
NVNG licensee immediately to terminate its operations interfering with
the DoD system.
[ 62 FR 59296 , Nov. 3, 1997, as amended at 78 FR 8430 , Feb. 6, 2013; 79 FR 8325 , Feb. 12, 2014]
Goto Section: 25.259 | 25.261
Goto Year: 2020 |
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