Digital Reprogrammable Software Radios R&S M3SR 3
Key features of the modules
The modules have the following out-
standing features:
◆ Independent use of all modules
(no alignment or manual adjustment
when modules are replaced)
◆ Central download of software and
firmware (no need to open the
radio unit)
◆ Data exchange via radio module bus
◆ Type label with bar code identification
down to PCB level (fast automated
detection and identification)
◆ All modules with electromagnetic
shielding (maximum EMC/EMI
immunity)
◆ All settings made via software
(reduced maintenance)
◆ Fast and easy replacement of
modules (short MTTR)
Modules for radio module slots
VHF/UHF Synthesizer Module
R&S GF4400T
The synthesizer module is the core of the
high-frequency structure of the radio
unit. It covers the frequency range from
100 MHz to 512 MHz, generates the RF
signal for driving the transmitter and sup-
plies the local oscillator (LO) signal for the
receiver module. Direct digital synthesis
(DDS) technology ensures fine frequency
tuning with high accuracy and high
speed. The extremely low-noise signal
generation allows the radio to be used at
sites with stringent requirements regard-
ing large-signal immunity (collocation).
VHF/UHF Receiver Module
R&S ET4400
The Main Receiver Module R&S ET4400
can be universally used for all operational
modes in the VHF/UHF range. The use of
programmable VLSI components makes
the module extremely compact, occupy-
ing only one slot. The flexible digital
demodulator allows the processing of
complex digital waveforms.
VHF/UHF Guard Receiver
R&S ET4400G
The R&S ET4400G simultaneously moni-
tors the emergency frequencies in the
VHF (121.5 MHz) and UHF (243 MHz)
ranges and can be installed in any R&S
M3SR model, irrespective of the other
modules. The AF of the guard receiver can
either be routed to one of the audio inter-
faces or mixed with the AF of the main
receiver. The software for using a guard
receiver is supplied with the basic unit.
Electronic Protective Measures (EPM)
Processor Module R&S GP4400
The powerful EPM Processor Module R&S
GP4400 handles data processing for spe-
cial waveforms. It occupies one radio mod-
ule slot and can host EPM waveforms such
as SATURN, SECOS or HAVE QUICK I/II on
its memory devices. Its functionality is
determined by the loaded software.
Power modules
VHF/UHF Transmitter Module
R&S VT4403
The R&S VT4403 is a universal transmitter
module for all operational modes in the
frequency range 100 MHz to 512 MHz
and is mounted in the R&S KR4400. This
means that there is one transmitter for
each radio. A PIN diode switch is pro-
vided for fast and reliable switchover
between transmission and reception. Two
low-noise, temperature-controlled fans
are provided on the rear panel for heat
dissipation of the transmitter.
Main Receiver Module R&S ET4400
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