Chapter 2 Design and Function
5300.9677.72 - 2.14 - EN-4
Analog audio inputs
The transmitter has two equal-priority analog audio inputs:
LEFT / MPX
RIGHT
The LEFT/MPX and RIGHT AF input connectors are designed as standardized XLR con-
nectors. The audio signal can be fed symmetrically to pin 2 and 3. Pin 1 is ground in each
case. An external stereo coder can be connected to the left channel in place of the line for
the left stereo channel, and will feed in the complete multiplex signal (MPX signal). The in-
put impedance depends on the software setting concerned.
Digital audio inputs
The transmitter has a digital audio input - DIGITAL AUDIO or AES/EBU.
The digital audio signal, which is standardized to AES/EBU, can be fed symmetrically to pin
2 and 3. Pin 1 is ground in each case. The input resistance on the AES/EBU input amounts
to an impedance of 110 Ω. An external stereo coder can be connected to the digital audio
input in place of the digital AES/EBU signal, and will feed in the complete analog multiplex
signal (MPX signal). In MPX mode the input impedance dependent on the software setting
concerned.
PILOT
If external modulators are used, a standardized 19 kHz squarewave signal for synchroniza-
tion of the modulators is provided at the BNC output socket PILOT.
X13 PILOT OUT Pilot tone output
X12 AUX1 (RDS) RDS input
X21 AES/EBU (MPX) AES/EBU (digital signal) or MPX (analog signal)
X11R RIGHT Analog audio (right channel)
X11L LEFT (MPX) Analog audio (left channel) or MPX (analog signal)
X6 ETHERNET Rear panel Ethernet connection
Signal ground
Voltage supply
Applies to R&S SR8250A only
X2 RF OUT Connection to X10 from R&S VU813
X22B Connection to X22 from R&S VU813
X61 RF OUT SPLIT Exciter output for separate amplifier R&S VU813
Connector Function
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