Functioning R&S SU 4200
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1.6.2 Functions Description
Function\ Function "Radio ".doc
Function of the
R&S SU 4200
transmitter
The transmitter R&S SU 4200 contains the R&S VU 4250 transmitter
module, which is powered by the R&S IN 4240 power supply unit.
Front panel
control unit
The front panel control unit A8 with LCD and keyboard A9 make local
control of the radio possible on a lab bench or for activities such as
installation and maintenance. The RF signal issued at common antenna X3
is demodulated in the transmitter module and can be audio-monitored at
any time via the built-in loudspeaker. You can control the volume by means
of the volume control on the front panel.
USB interface
You can configure and make basic settings for the radio via the USB
interface on the front panel. In addition you can download software of all
firmware components via the USB. The main backplane A6, which
connects all modules, contains a USB hub and connects the transmitter's
USB interface controller with the front panel control unit A7.
Power supply
The main fan is controlled and monitored by control unit A8. The radio can
be powered by AC and/or DC voltage. If the AC source fails, the radio
automatically switches to the DC source. You can switch the radio on with
the switch on the front panel A7.
Display
LEDs indicate the current operating state at all times. You can display the
operating settings, radio configuration, analog measurement values and
status in detail on an eight-row LCD.
Audio interface
On the system side the 600 ohm audio interface “TX Audio Basic X5” is
connected to the rear panel and the PTT keying is activated. You can
flexibly configure the PTT input via service PC and adjust it to the voltage
conditions (–48, +28, optocoupler input) in the system. Remote control is
performed as standard via the Ethernet – LAN interface “Ethernet – LAN
Remote Control X6” or the RS-485 ‘’TX Audio Extended X7’’ using the
powerful R&S remote-control protocol GB2PP.
Main and
standby function
For redundant system installations with 1:1 switchover, the main and
standby radios are connected with each other via hardware contacts. This
allows quick switchover without any delay in the event of a failure. In
addition, an antenna relay can be connected and controlled.
Extended DSUB
interface
The 15-contact extended DSUB interface “TX Audio Extended X7”
provides discrete digital control contacts too.
Transmit antenna
The transmit antenna is connected to N-connector X3. The transmitter
consists of power board A4 with 200 Wpep output stage and analog/digital
board A1 with the main VCXO/clock processing unit, VCO/synthesizer, 600
ohm audio interface, DSP, LAN and USB controller. The AM
and ACARS modulation signals are processed digitally in the baseband
and transformed to output frequency via the I/Q modulator. The output
signal of the transmit output stage is coupled out and linearized via
feedback loop. The VHF transmitter R&S SU 4200 includes a Cartesian I/Q
control loop. Modules A4 and A1 are mounted on the high-power heat sink
and are cooled by the fan.
Main TCXO (VAR.02)
The main TCXO on the A6 backplane board serves as the reference for the
radio and can be easily adjusted via the USB interface.
Main OCXO (VAR.03)
The main OCXO on the A6 backplane board serves as the reference for
the radio and can be easily adjusted via the USB interface.
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