The antenna group
upconverter. The output of the on-line up-converters
are used to drive the on-line amplifier/mixer which drives
consists of the reflector, feed assemblies, drives and
the on-line power amplifier. The output of the power
controls. The reflector consists of a center section and
amplifier (at the desired level) goes to the antenna feed
four quarter-section panels which are easily assembled
through a waveguide system. In the multiple carrier
on a sturdy support structure. The antenna contains
configuration, as many as four upconverters may be
both elevation and cross-elevation actuators for satellite
patched to the amplifier/mixer unit where they are
acquisition and tracking. It is electrically connected to
adjusted for a prescribed power level, combined and
an antenna control assembly mounted within the shelter
routed to the on-line power amplifier.
and may also be connected to a remote control unit.
b. Receiving Group. The receiving group in the
Antenna AS-3199/TSC must be used in multicarrier
terminal includes the antenna mounted electronics and
d. Power Source and Distribution Group.
the downconverters. The antenna mounted electronics
terminal is normally operated from one of two 30 kW
includes two low noise amplifiers (LNA), an LNA BITE
diesel generator sets mounted on the power pallet;
box, a wideband preselector, a directional coupler and
however, it may also be operated from an external
waveguide switch. There are five downconverters which
source of power. Circuit breaker control and protection
convert the received carrier frequency to the 70 MHz IF
is provided by the power distribution panel. The power
or 700 MHz IF. The 70 MHz IF frequency is used for
distribution panel contains circuits for sensing and circuit
breaker control for over and under voltage and over and
group. The 700 MHz IF is used with external systems.
under frequency conditions.
The receiving group includes a five-way power division
which provides a receive signal input to each of the five
Detailed Terminal System Description.
c. Transmitting Group.
The transmitting group
consists of two amplifier/mixers, four upconverters and
This section provides a more detailed functional
two power amplifiers (with separate power supplies).
description of the AN/TSC-86 terminal.
One of the power amplifier units and one of the
a. Transmit Section.
amplifier/mixer units is a standby. The amplifier/mixer
functional block diagram of the transmit section of the
units are used in the multiple carrier configuration. The
terminal. The terminal accepts external 70 MHz and
incoming IF signals are fed to the upconverter. The
700 MHz signals for conversion to 7900 to 8400 MHz. If
upconverter accepts and translates the 70 MHz input to
more than one carrier is to be transmitted, special units
700 MHz and accepts the 700 MHz input.
for combining and monitoring the carriers are patched
amplifying and filtering it, the upconverter translates it to
into use by means of the transmit patch panel.
the selected transmit frequency (7.9 to 8.399999 GHz)
and it is again amplified in the IPA module of the