Comtech EF Data C5 - Manual (Page 24)

Introduction C5/K1/K3 Integrated Satellite Terminal System
1–4 Rev. 0
1.1.1 Description
The SDT-5200 indoor unit (IDU) is a 1 RU rack-mounted module that includes all the
functionality of a variable data rack modem, along with the high-stability reference and
power supply for the ODU.
Microcontrollers in both the IDU and ODU monitor and control all operational
parameters and status of the system. The system also reports terminal configuration
status, as well as fault status of all system components. A simple command set allows
configuration, control, and retrieval of status information.
The C-Band satellite terminal system is divided into three areas of operation:
1. SDT-5200 Indoor Unit (IDU). A complete, variable data rate modem, high
stability references, and power supply for the ODU in a 1 RU package.
2. Outdoor Unit (ODU). A weatherproof C-Band up converter/power amplifier and
a low noise block (LNA) down converter. The ODU is mounted on the spar of
the antenna and is connected via coaxial cables to the IDU and the LNA.
3. Low Noise Amplifier (LNA) Assembly. Consists of a waveguide Transmit
Reject Filter (TRF) and LNA.
C-Band - The ODU accepts a 790
" 11 MHz TXIF signal and transmits it in the 5.925 to
6.425 GHz frequency band. Output power level is controlled by an ALC loop to provide
extremely stable output power regardless of temperature variations.
C-Band - The low noise assembly (LNA) (60
#K standard noise temperature) on the OMT
accepts an RF signal in the 3.7 to 4.2 GHz band and amplifies the desired signal to be
received. The ODU down converters converts the signal to an IF of 950 to 1450 MHz.