15° W longitude, and 10 LEASAT (L-2) is positioned
at 72.5° E longitude (figure 2-6).
Each LEASAT provides 13 communications
channels using 9 transmitters. There are 7 25-kHz UHF
downlink channels, 1 500-kHz wideband channel, and
5 5-kHz channels. The 500-kHz channel and the 725-
kHz channels are leased by the Navy. One of the 725-
kHz UHF downlink channels is the downlink for the
Fleet Satellite Broadcast.
The broadcast uplink is SHF, with translation to
UHF taking place in the satellite. The remaining 625-
kHz channels function as direct-relay channels with
several repeaters. Currently, the LEASAT channels
provide for the following subsystems:
Channel 1 for Fleet Satellite Broadcast
transmissions;
1 25-kHz channel for SSIXS communications;
1 25-kHz channel for ASWIXS com-
munications; and
2 25-kHz channels for subsystems that transmit
or receive via DAMA (Demand Assigned
M u l t i p l e A c c e s s ) ( f o r e x a m p l e,
CUDIXS/NAVMACS, TACINTEL, and secure
voice).
PHASE IV
Operations Desert Shield/Desert Storm reinforced
the requirement for and greatly accelerated the
introduction of SHF SATCOM capability on aircraft
carriers and amphibious flagships to satisfy minimum
tactical command and control (C2), intelligence and
warfighting communications requirements while
improving Joint and NATO/Allied communications
interoperability. To meet the urgent operational
requirement, the U.S. Navy obtained and modified U.S.
Air Force AN/TSC-93B Ground Mobile Forces (GMF)
SHF SATCOM vans for installation on aircraft carriers
and amphibious flagships deploying to the Persian
Gulf. The modified vans were coupled with the
AN/WSC-6(V) standard U.S. Navy SHF stabilized
antenna system, the SURTASS modem, 2 low speed
time division multiplexer (LSTDMs), and additional
Figure 2-6.—LEASAT coverage areas.
2-6
