User Manual
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Operator’s Manual • User Information
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(See Fig. 1.3)
The M3SR Transceiver is accommodated in a sturdy 19" case of 3 height units, its top being
formed by a detachable screwed-down metal cover. After removing this cover, the modules of
XT 4410A become visible, which are:
q Radio Basis KR 4400, Mod. 04
It is formed by several items, namely the mechanical parts chassis and housing, which
accommodate the internal transceiver modules. Located in the left-hand part of the chas-
sis is the radio platform, containing a number of interface connectors for interfacing with
the internal subassemblies and also with the outside. For internal signal transfer a Radio
Module Bus, consisting of Radio Control Bus and Radio Data Bus, is available. Another
part of the radio basis is the Front Panel Unit, located directly at the front on the right. It
contains various control and display elements such as LEDs and buttons, external con-
nectors as well as a loudspeaker.
q VHF/UHF Receiver ET 4400 (main receiver)
The receiver is a plug-in module located in one of the slots in the centre left-hand part of
the chassis. It is of compact design, both sides being EMC-protected by appropriate
shielding covers. Once plugged into the radio platform in its assigned slot, the receiver is
held in place by quick-release fasteners.
q VHF/UHF Synthesizer GF 4400T
The synthesizer is a plug-in module located in one of the slots in the centre left-hand part
of the chassis. It is of compact design, both sides being EMC-protected by appropriate
shielding covers. Once plugged into the radio platform in its assigned slot, the synthesiz-
er is held in place by quick-release fasteners.
q Interface Module GH 4450
The interface module is a plug-in module in the left-hand rear part of the chassis. At its
top it carries several connectors for ribbon-cable connections towards the transmitter
unit. In addition, the plug-in module contains three interfaces for the rear modules.
q Transmitter Unit VT 4403, Mod. 02
The transmitter unit is a power module located in the right-hand part of the chassis and
extending over its full depth. It is made up of the actual transmitter board at the top and
the DC power supply located underneath. Both subassemblies are shielded by EMC cov-
ers. Also part of the transmitter unit is a heat sink with two fans, which are accommodated
directly at the rear, also on the right-hand side.
q Control Unit GB 4000C, Mod. 02
The control unit is located at the front on the left-hand side. It contains a display, control
and display elements such as LEDs, fixed-function keys and softkeys, a keypad and a
connector.
q UHF Filter FD 4430
The UHF filter is a plug-in module located in the centre left-hand part of the chassis, next
to the control unit. Once plugged into the radio platform in its assigned slot, the UHF filter
is held in place by quick-release fasteners.