TM 11-5895-846-14
Section III. ELECTRONIC FUNCTIONAL DESCRIPTION
a. As shown in figure FO-4 and 6-9, the satellite
6-7. Introduction
signal is received by the antenna and is routed through
the following path: orthomode transducer, waveguide
This section contains the overall block diagram
section, directional coupler, waveguide section,
discussion pertaining to the terminal. For all of this
wideband preselector, waveguide section, and then to
discussion refer to the overall functional block diagram
the low-noise amplifier (LNA) waveguide switch. The
(fig. FO-4) as well as the specific block diagram within
input to each LNA is common to this waveguide switch.
the text. The terminal is designed to provide point-to-
The output of each LNA is common to a coaxial switch
point trunking facilities in a diverse range of
located in the LNA BITE ASSEMBLY. An on-line select
environmental conditions. Working through the DSCS
control on the LNA control/translator inside the shelter
actuates both switches. This control selects one of the
be established in minutes without the need for midpoint
two LNA for on-line operation by switching the LNA
waveguide
and
LNA
BITE
coaxial
switches
simultaneously. The off-line LNA is connected to the
6-8. Signal Flow, RF Subsystem
LNA BITE. All of the above RF components are
6-16