Norsat O3b 20W BUC - Manual (Page 5)

IF unit amplifies the transmission signal from a remote modem and delivers it to the Up-converter
unit.
1.2.2 LO unit
LO unit generates two local signals to drive two LO ports of the up-converter using double
conversion structure.
1.2.3 Up-converter unit
Up-Converter converts the IF signal (A:1052-1788 MHz, B: 972-1871 MHz) to RF signal (A: 27.652-
28.388 GHz, B: 28.172-29.071 GHz) and also filters out unwanted spurious and harmonics in front
of SSPA. The BUC uses a double-conversion technology to achieve better performance and cost-
effective design.
1.2.4 SSPA unit
The main function of SSPA is to boost up the transmit power of the input signal to an expected level.
The SSPA includes the following modules: Divider, Power Amplifiers, and Combiner.
1.2.5 DC M&C unit
This board includes a DC/DC converter, regulators, and an EMI/EMC filter to make all kinds of DC
voltages required in the BUC. It also contains a Monitor and Control (M&C) function to monitor and
control the BUC, and communicate with a remote modem unit. The key parts for the M&C function
are a microprocessor and communication ICs for RS-232 and Ethernet.
1.3 CAUTIONS AND WARNINGS
Read all the following instructions prior to using the BUC.
1.3.1 Introduction
There is a potential safety risk unless appropriate precautions are taken while working with the BUC.
All the precaution and danger notes must be carefully read before beginning to use the BUC.
1.3.2 ESD Protection
The BUC contains elements sensitive to electrostatic discharges (ESD). It is important that the staff
is ground-connected while they are working with them.
1.3.3 Cleaning
Do not use liquid washing products or aerosols. Only use a damp cloth for cleaning.
1.3.4 Water
© 2014 Norsat International Inc. Page 5 of 25