Goto Section: 25.260 | 25.262 | Table of Contents
Revised as of October 26, 2020
Goto Year:2020 |
§ 25.261 Sharing among NGSO FSS space stations.
(a) Scope. This section applies to NGSO FSS operation with earth
stations with directional antennas anywhere in the world under a
Commission license, or in the United States under a grant of U.S.
(b) Coordination. NGSO FSS operators must coordinate in good faith the
use of commonly authorized frequencies.
(c) Default procedure. Absent coordination between two or more
satellite systems, whenever the increase in system noise temperature of
an earth station receiver, or a space station receiver for a satellite
with on-board processing, of either system, ΔT/T, exceeds 6 percent due
to interference from emissions originating in the other system in a
commonly authorized frequency band, such frequency band will be divided
among the affected satellite networks in accordance with the following
(1) Each of n (number of) satellite networks involved must select 1/n
of the assigned spectrum available in each of these frequency bands.
The selection order for each satellite network will be determined by
the date that the first space station in each satellite system is
launched and capable of operating in the frequency band under
(2) The affected station(s) of the respective satellite systems may
operate in only the selected (1/n) spectrum associated with its
satellite system while the ΔT/T of 6 percent threshold is exceeded;
(3) All affected station(s) may resume operations throughout the
assigned frequency bands once the threshold is no longer exceeded.
[ 82 FR 59986 , Dec. 18, 2017]
Goto Section: 25.260 | 25.262
Goto Year: 2020 |
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