User's Manual Part 1

Table Of Contents
Functiona
l
Description 3EM21522AAAA
DTR-0200-SA-SIRIUS Issue 1, March 2008
2-10
Figure 2 - 5 Modulator Module
2.3.1.3
Up-Converter
Figure 2 - 6 shows the up-converter panel. The up-converter converts the modulator
IF (I and Q channels) output to S-Band.
An up converter controller applies DAC-controlled DC offset to each IF channel,
attenuates and filters the c
hannels, and then sends them to the up-converter for
S-Band frequency con-version.
The 2.32625 GHz S-Band output of the up-converter feeds into the pre-driver of the
HP
A.
Figure 2 - 6 Up-Converter Module Panel
2.3.1.4
SPU Main Controller Board
See Figure 2 - 7 and Figure 2 - 8 connector panel and functional block diagram.
The main controller supports the repeater site operation, configuration, manage-
ment, and status reporting. It manages power-up, power-down and RF control pro-
cesses. The controller provides capability for remote upgrade of repeater software,
and provides local and remote interfacing for all command and status functions
(inc
luding digital, thermal, power, and RF performance of the repeater).