www.kvarta.net
11
/
36
11
RDS300/RDS500/RDS1000 User Manual 3.10
3.3. CONNECTION TO THE BROADCAST CHAIN
If the RDS Encoder is to be used in ‘Loop through’ mode, connect the output of your stereo
generator/multiplexer to the ‘MPX IN / SYNC’ jack of the encoder, using 75 ohm coaxial cable. Then
connect the ‘MPX OUT’ jack of the RDS Encoder to the composite/multiplex input of your exciter or
pilot transmitter.
If you have chosen to install the RDS Encoder in the ‘Side Chain’ configuration, simply
connect the ‘RDS IN/OUT’ jack of the encoder to the 57 kHz SCA or RDS jack on the pilot/exciter. You
may also connect from the ‘MPX OUT’ jack of the RDS Encoder; providing you are certain you have
the internal jumpers configured properly to block the main composite/MPX signal from also
appearing at this jack (see section 3.1.1).
NOTE:
If you have configured your RDS Encoder for ‘Side Chain’ operation, you should provide a
composite or 19kHz feed from your stereo generator to the RDS Encoder’s ‘MPX IN’. You may
accomplish this with a simple ‘T’ connector in the coaxial path between the stereo
generator/multiplexer and your exciter/pilot transmitter. The RDS Encoder presents no load or other
damaging characteristics to the signal.
3.4. SYNCHONIZING THE RDS SUBCARRIER
It is desirable to set the RDS subcarrier exactly 90 degrees out of phase with the 19 kHz pilot. This
achieves ‘quadrature’ and slightly reduces the overall modulation of the subcarriers, without redu
cing their actual levels. To envision this, examine the following pictures:
RDS and 19 kHz in synch RDS and Pilot 90° out of phase. The phase of the RDS subcarrier in relation
to the 19 kHz signal is adjustable within the RDS Encoder. You may adjust the phase on the ‘configure
RDS Encoder’ page of the embedded website, or via UDP/TCP terminal with the command
PHASE=<x>
where x is a number between 0 and 359. Query the encoder with
PHASE?
RDS and 19 kHz in synch
RDS and Pilot 90° out of phase
