TM 11-5895-846-14
c. The terminal group is composed of three major
module and component levels between tactical and,
contingency terminals optimize logistics support
subsections. These include an S-280 type shelter
requirements for these systems.
housing all terminal electronics (except the receiver low
f.
The communications subsystem
(CSS)
noise amplifier), an eight foot ground mounted parabolic
provides the interface and signal processing functions
antenna and primary power support pallet. The latter
between the individual field user lines and the RF
subsytem of the AN/TSC-86 terminal. Baseband and
terminal excitation. Mobility is provided by two M-832
signal conditioning equipment included in the CSS
transporters. In the transport mode, all antenna sections
provides processing of user VF, teletype and digital
and associated ground system are housed within the
signals into a single PCM signal. Bulk encryption of this
shelter. The terminal, readied for transport, is therefore
signal is provided by the TSEC/KG-81 prior to application
reduced to two independent packages mounted on
to the QPSK/BPSK digital data modem. The 70 MHz
individual dolly assemblies. Terminal compatibility with
output from the latter equipment is applied to the
the M35 truck permits transport by this vehicle if desired.
The antenna interface permits replacement of the eight
AN/UGC-129 teletype terminal and orderwire facility
foot antenna with the AS-3199/TSC (20-foot) high gain
permits drop/insert of local comm-signals into the
antenna group for operation under multicarrier service.
system. Modems, multiplexers, crypto devices and
Operation with the latter requires the transfer of certain
numerous other baseband equipments are redundant for
antenna mounted electronic items from the eight foot
reliability enhancement. Patching facilities are included
antenna to the larger unit. These elements consist of the
to select the desired signal path through the equipment
receiver low noise front end and is limited to LNA
complement.
devices.
Compatible dimensions between the two
g. A central distribution frame (CDF) included as
antenna types have been maintained for easy
substitution.
a portion of the CSS houses a matrix programming
d. The shelter electronics complement is divided
board which provides a traffic path reconfiguration
into two subsystems. These include:
capability. Thus the individual user lines terminating at
(1) RF Subsystem (RSS).
the shelter entrance panel can be routed to specific
channels of line conditioning equipment. The shelter
e. The RF subsystem (RSS) is configured to
side of the signal entry panel forms the main distribution
frame (MDF). VF/TTY signal lines entering the terminal
provide single SHF carrier transmission and reception
from 70 20 MHz IF ports supported by the
are terminated at EMP protection devices included in the
MDF prior to routing to the CDF. Shielded data lines are
terminated in lightning arrestors compatible with system
input/output capability is provided by the up/down
requirements. Several analog and digital test sets are
this larger bandwidth capability is presently restricted,
VF/data circuits for monitor/maintenance purposes.
however, by the limited bandwidth of the high power
h. A plan view of the shelter entry panels and
klystron amplifier which forms the output stage of the
transmitter. Multicarrier performance is also included in
the AN/TSC-86.
associated combiner assembly are included in the
equipment complement permitting transmission and
reception of up to four carriers. Many of the design
features implemented in the tactical equipment are
included in this larger terminal. Commonality at the
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