Doug Lung /
11.21.2012 12:51 PM
LightSquared Petitions for NOAA Spectrum Use
This spectrum would replace the 1545-1555 MHz spectrum segment terrestrial purposes
LightSquared has filed a Petition
for Rulemaking asking the FCC to allocate the 1675-1680 MHz
band for terrestrial mobile use. Along with the 1670-1675 MHz spectrum it
already has. This spectrum would replace the 1545-1555 MHz spectrum segment terrestrial
purposes, avoiding--LightSquared claims--the problems of interference to GPS
receivers that have thwarted its efforts to roll out a nationwide wireless
In the Petition, LightSquared said it would “Permanently
relinquish its authority to conduct terrestrial operations in the upper 10 MHz
downlink band at 1545-1555 MHz...”
If the Petition is granted, LightSquared would use 1670-1680
MHz for its terrestrial network and forgo use of its spectrum at 1526-1536 MHz,
pending outcome of a separate FCC rulemaking petition. It would continue to use
its two 10 MHz uplink bands at 1627.5-1637.5 MHz and 1646.7-1656.7 MHz under
their existing technical parameters and match them to its alternative downlink
channel in the 1670-1680 MHz spectrum.
The 1675-1680 MHz spectrum is used for federal and non-federal
meteorological aids and the Meteorological-Satellite Service. LightSquared
proposes that any operations in the band would “proceed in cooperation with
federal government uses under the existing primary allocations of this band
segment for meteorological aids and the Meteorological-Satellite Service. Use
of this spectrum would impact private users receiving polar orbiting satellite
NOAA 19 and NOAA 16 HRPT images.
Perhaps more important, the GOES-13, GOES-14, and GOES-15
geostationary weather satellite use frequencies at 1685.7 MHz and 1691 MHz for
GVAR and LRIT digital images. Private weather services and hobbyists that
receive weather images from the satellites could be impacted by LightSquared’s
terrestrial use of this spectrum.
As the weather satellites use only part of the band,
LightSquared is requesting and because large, directional antennas are used to
receive the satellites, perhaps one solution would be for LightSquared to avoid
use of the GOES satellite frequencies and perhaps the NOAA polar satellite
The FCC issued a Public
Notice inviting comments on LightSquared's proposal.
Comments/Petitions to Deny are due Dec. 17, 2012, oppositions are Jan. 4, 2013
and replies are due Jan. 11, 2013.