Selection Of Operating Modes; Sidechain Mode; Loop-Through Mode - DEVA Broadcast SmartGen Micro Maintenance And Operation Instruction Manual

Selection of Operating Modes

SIDECHAIN MODE

Configured for sidechain operation, the rear-panel PILOT OR MPX INPUT connector simply
bridges (monitors) the output of the stereo generator to derive timing information from the 19kHz
stereo pilot. Alternatively, a TTL-level 19kHz sync squarewave may be applied to this input. We
do not recommend this, however, as the phase relationship between the synchronizing squarewave
and the 19kHz pilot component in the composite, multiplex output of the stereo generator may not
be assured.
In sidechain operation the RDS OR MPX OUTPUT will contain only the RDS subcarrier,
the composite/MPX signal is not routed through the SmartGen Micro. This operating mode best
preserves multiplex signal integrity and assures uninterrupted program transmission in the event
of a catastrophic encoder failure (very doubtful). As delivered, the SmartGen Micro is configured
for sidechain operation.

LOOP-THROUGH MODE

When the SmartGen Micro is configured for loop-through operation, the RDS subcarrier is
internally combined with the composite/MPX signal. This means that the RDS OR MPX OUTPUT
will include the composite/MPX program signal (at unity gain) with the RDS subcarrier added.
Also, in the loop-through mode the internal bypass relay will pass-through the multiplex signal in
the event of an encoder power failure.
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56 820027, Fax: +359 56 836700
E-mail: office@devabroadcast.com ,Web: www.devabroadcast.com
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