TRDS4002
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User Manual
Rev. 1.0 - 03/08/05
A special device is required to maintain the normal signal. This device will insert the
RDS signal to every individual transmitter.
Such a device is the RDS MIXER MKII.
5.3 Interconnection
The RDS data encoder must be connected between the stereo encoder and the
transmitter.
The stereo encoder’s multiplex output should be connected to the
MPX IN
input of
the RDS encoder.
The
MPX+RDS OUT
output should be connected to the input of the transmitter.
It is advisable to keep cable lengths to less than 3 metres.
The injection of the
RDS
signal has been factory-adjusted for an
MPX
input level of 0
dBm (and a 19 KHz pilot level of -20 dB).
For higher input signal levels, turn the “
RDS LEVEL
” multi-turn potentiometer
clockwise.
International standards recommend an RDS level of -31.5 dB with respect to
the stereo and consequently -11.5 dB with respect to the pilot.
No phase adjustment is required as synchronization is performed
automatically by internal circuitry.
In the event of monophonic transmissions, the RDS data encoder should be
connected between the last low frequency unit in the audio chain and the transmitter.
5.3 RS232 Serial Port
The Serial connection RS232C is standard and has a 9 poles Cannon connector.
As per each RS232 connection, the length must not be superior to 20 m and the
shielding must be adequate.
Anyway, it is possible to extend the connection at any time by using a couple of
standard line extensors.
5.4 Software
The RDS coder control program is supplied together with this handbook in CDROM
version. It must be installed on a computer with CPU Pentium 266 or better and a
Windows 95/98 version must be installed. The software cannot run without these
configurations or, in the best of cases, it will run but will not be able to communicate
correctly with the coder.