R&S 4200 Series, Operating Manual

Page: 42 / 220

R&S XU 4200 General Data
6166.5368.02.01 1.6
Extended DSUB
interface Receiver module:
The 15-contact extended DSUB interface “RX Audio Extended X11“
provides discrete digital control contacts as well as the analog output for
RSSI received signal strength.
Transmitter module:
The 15-contact extended DSUB interface “TX Audio Extended X7”
provides discrete digital control contacts too.
Receive antenna The receive antenna is connected to the BNC input "RX Input X8". The
receiver consists of the analog RF board A3 with its VCO/synthesizer and
600 ohm audio interfaces as well as the digital interface module A5 with
the main VCXO/clock processing unit, DSP, LAN and USB controller. The
received signal is mixed and converted to the first intermediate frequency
(IF). The remaining processing is performed digitally, where the various
channel spacing 8.33 kHz/25 kHz and modulation schemes AM and
ACARS are processed via the software.
Transmit antenna The transmit antenna is connected at 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 the
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 The main TCXO on the A6 backplane board serves as the reference for the
radio and can be easily adjusted via the USB interface.
1.7 General Data
Note: See General Data in the Appendix.
1.8 Accessories
Note: See Accessories in the Appendix.
Last Page of Chapter 1\\Last Page of Chapter 1 "Radio".doc