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APPENDIX F – SIDECHAIN / LOOPTHROUGH CONNECTION MODES

ENG

115

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35 APPENDIX F – SIDECHAIN / LOOPTHROUGH CONNECTION MODES

The MPX+RDS Encoder Barracuda can be connected to the exciter and to the RDS generator / audio processor in two

different modes: Sidechain and Loop-Through. The first one is highly recommended, as the composite / MPX is better

preserved and program transmission will be not interrupted even in the event of encoder failure.

35.1 SIDECHAIN MODE (SUGGESTED)

Depending on the availability of a SYNC reference signal, the following cases are possible: NB Using the 19 kHz clock

from the Barracuda stereo generator makes it much easier to phase lock the RDS signal to the pilot frequency. This is

extremely helpful in eliminating intermodulation components that might exist between the pilot and RDS signal.

35.1.1 LOOP-throught – MPX MODE

In the loop-through mode, the output of the stereo generator is directly cabled at the AUX 1 input of RDS encoder. The

RDS output of the encoder will be then connected to the normal composite/Mpx input of the FM exciter.As noticed, this

configuration is NOT recommended, as the composite / MPX is passing through the RDS encoder and program

transmission will be interrupted in the event of RDS encoder failure. This configuration doesn’t need to alter the encoder

factory preset. RDS subcarrier phase will be locked either to external FM stereo MPX signal. Correct synchronization will

cause MPX LED ON in the front panel.

MPX + RDS (TX In)

MPX+RDS Out

AUX1-MPX

MPX Out

BARRACUDA

MPX Coder

RDS Encoder

(ie TigerShark-R,

Shark, Dolphin)

Transmitter

Analogic INPU

coming from

MAIN OUT

Sync In

Sync Out

External Synch MUST be enabled from the control panel menu or from the Pc control software

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Barracuda Networks SP4 Manual de usuario Pagina 115