User's Manual

A4D-ESxT/1 Outdoor Multichannel Transmitter Arch. 2694
Rev. A of 8/11/2007
Pag. 7 di 30
Eurotek s.r.l.
3. A4D-ESxT/1 Block Diagram
The block diagram description is valid for the complete board family, only minor differences will be
pointed out if essential to the reader understanding.
Each board has two main accesses, the first one is for the IF analog signal and the second one is a
pure digital access devoted to board management.
3.1. Duplexer
The connection between the indoor unit EK-MFR/1 and the outdoor unit is made through a coaxial
cable carring the 70MHz IF signal, FDM control signals and the power supply. The modulated
carrier is dropped by the duplexer and demodulated in order to establish the communication
between indoor and outdoor units. The low pass filter inside the duplexer selects the bias volage to
be applied to the DC/DC converters .
IMG2
IF
Var Gain Amplifier
Mixer
BP Filter Amplifier
90° Hybrid I/Q Mixer
Driver Amp
Power Amp
Control Unit
IMG1
LO 1
LO 2
Duplexer
FDM System
DC / DC