1.4
STL connection diagram
1.4.1 Connection diagrams for
streaming transport
The figures above shows two examples of
streaming link in FM stations.
In diagram
(a)
the audio processor is located at the
studies, and carries the processed audio to a
ADA102mpx connected directly to transmitter. In this
way the processor works with the audio signal
directly from the console, and ADA102 carries the
processed audio. This is the recommended
configuration for FM.
The diagram
(b)
shows a chain of 100% digital audio,
using inputs and outputs AES-3. In this case, the
processor appears in transmission plant, which is
processing the audio decoding of MPEG streaming.
The output of MPX audio processor is connected
directly to the transmitter.
In
AM stations
, the audio processor must be close
to the transmitter to maintain a DC coupling that
allows the asymmetric modulation.
Figure (a) – STL with audio processor at the Studios
Fig.(b) – STL using an digital audio chain. For AM stations, the audio processor must be next to the transmitter
1.4.2
Set the audio levels
1.4.2.1
Audio processor locates at the
studios with analogical connections
When the audio processor is at the Studio,
connected by analog input
– case (a) mentioned
above –
the input level of ADA102 CODER is a
critical issue.
•
Choose a high density musical program.
•
Play on-air the music and check the audio
processor to verify that the AGC compression
be 10 dB or higher.
•
Adjust carefully the ADA102 input gain to
obtain a 0 VU deviation with the peaks.
Needle must never overpass the 0 VU
indication.
At the other end,
ADA102mpx
receives the
streaming. The incoming streaming is decoded and
sent to MPX stage. To adjust the 100 % of
modulation proceed:
•
ADA102mpx has two presets at the rear
panel: MPX level and 19 kHz Pilot Tone
level.
•
Playing the same high-density song used
to adjust the CODER, adjust the MPX level
preset to obtain 100% of modulation at the
transmitter. Read this value at the exciter
VUmeter
•
If you have a modulation meter available
(Solidyne VA16, Belar, Innovonics, etc.) we
recommends to use the measurements of
this instrument instead of the exciter value.
•
If you have a modulation meter available,
adjust the pilot tone depth to 8% / 10%
using the correspondent preset of
SOLIDYNE
ADA102 CODER/DECODER
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