3
Installation and Rear Panel
Physical Installation
Studio or Transmitter?
Obviously, if you’re using VOLT:FM or VOLT:SG’s internal stereo generator with composite
output, it should be close to the transmitter(s)
7
. All operating functions can be controlled easily
over a network, so you’ve got complete flexibility to tune a transmitter’s VOLT from the studio.
But if you’re planning to locate VOLT at the studio and feed Left / Right audio (with no
subcarrier) to a transmitter via STL, we urge you to use a linear STL that does not have data
reduction or compression. This may be non-intuitive: after all, today’s best compressed STLs
can sound pretty good. The problem is that lossy compression algorithms are designed for
normal, unprocessed speech and music in normal listening situations. VOLT optimizes your
signal for transmission, and the clipper is designed to create maximum loudness with minimum
distortion when broadcast. This can create waveforms that sound great on the air… but break
the lossy compression schemes in some STLs. The result that the STL will create extra distortion
and lack of clarity, before the signal even gets to the transmitter.
This warning also applies to HD and DRM transmission using VOLT’s HD Pro DSP|Core. Our
exclusive Sensus processing can actually eliminate some of the distortions of those compressed
media. But “double compression”—first, through a lossy STL, and then through a compressed
digital media transmitter—can create unpredictable interactions that even Sensus can’t fix.
Increasingly, facilities with high bandwidth ber links between their studios and transmitter sites
are discovering that Livewire AoIP can be used as a high reliability, lossless STL. It lets you feed
a VOLT at the transmitter using Livewire Xnode at the studio, or use VOLT at the studio to send
processed AoIP audio to the transmitter. The Livewire capability built into every VOLT lets you take
advantage of today’s faster and cheaper IP bandwidth, with ever-increasing STL options.
7 VOLT has two separately adjustable composite outputs, so you can drive a main transmitter and backup
simultaneously.
CHAPTER 3
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INSTALLATION AND REAR PANEL
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