SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 18 / 232

2
SeaSpace Corporation
1.4 C
ONVENTIONS
U
SED IN
T
HIS
M
ANUAL
This manual includes procedures that require the user to enter UNIX commands. These commands are shown
on a separate line in bold courier type at a command-line prompt (such as %). To enter a command, type in the
bolded words, then press the Return key (or Enter key). A <Return> placed at the end of a command line is
there to remind you to press the Return key (or Enter key).
Some commands include variable arguments shown in italic courier type that you must replace with a specific
value. For example, in the command,
ac chain pos
you must substitute
chain
with a telemetry chain
number.
1.5 T
ECHNICAL
D
ESCRIPTION
The 1.5m three-axis tracking antenna provides real-time data acquisition from satellites in a polar orbit. The
antenna subsystem consists of the following components (as shown in drawing 70909001 on page 3).
1.5.1 Outdoor Equipment
(see drawing 70909004 on page 27)
a. 1.5m dish mounted on a positioner. This is the tracking antenna.
Two models of antenna are included in this manual:
Model 6003AL: Three servo amplifiers are integrated in the PCU enclosure.
Model 6003L: Three servo amplifiers are mounted on the antenna separate from the PCU.
b. The antenna is mounted inside a protective fiberglass radome. There are two types of radomes:
1) The radome is mounted on a base frame.
2) The radome mounts to the top of a round plate on a pedestal.
c. Mounted at the focal point of the dish is an RHCP feed receiving L-Band or L & S-Bands, one or two
low-noise amplifiers (LNAs), and one or two downconverters.
d. The positioner is controlled by a Pedestal Control Unit (PCU).
e. Power is supplied to the antenna via the antenna control cable from the computer.
f. A coaxial cable connects the antenna to the inside equipment. The IF signal is sent through the
antenna cable to the receiver. Commands from the computer are sent through the antenna cable to
the antenna PCU.
1.5.2 Indoor Equipment
a. For systems with an HR300 or TR100/TR101 receiver, the IF signal from the antenna is split off from
the antenna control cable.
b. The antenna tracking commands are sent to the PCU from the computer.