OPTIMOD-FM INSTALLATION
2-31
• Calibrate with unprocessed audio, step (B), page 2-31, or
• Calibrate with a Studio Level Control System that has a built-in 100% Calibra-
tion Tone, such as the Orban 8200ST-Studio Chassis or the Orban 4000 Trans-
mission Limiter, step (C), page 2-31, or
• C
alibrate with an Orban 464A Co-Operator, step (D), page 2-32,
as appropriate.
Note that in this step, you are calibrating to the absolute peak level; this is
quite different from the maximum peak indication of the studio meters.
A) Calibrate with program material and normal programming levels.
[Skip this step if you are calibrating in another manner.]
a) Adjust the Clip Level so that program peaks indicate approximately –15 dB on
the input meters.
Observe the meters on the 8400 screen for a long period; be sure to observe
live announcer voice. If this setting is misadjusted, distortion will result.
0 dB indicates input clipping on the 8400. These meters should never peak
as high as 0 dB with program material; always leave a safety margin of
headroom.
B)
Calibrate with program material and worst-case programming levels (best method):
[Skip this step if you are calibrating in another manner.]
a) Play program material from your studio at a much higher level than normal—
turn the faders up all the way!
This will produce the highest peak level output that your system can pro-
duce.
b)
Adjust the 8400’s Clip Level so that on program peaks the input meters indicate
no more than approximately –2 dB.
0 dB indicates input clipping on the 8400. These meters should never peak
as high as 0 dB with program material; always leave a safety margin of
headroom.
C)
Calibrate with a Studio Level Control System that has a built-in 100% Calibration
Tone, such as the Orban 8200ST-Studio Chassis or the Orban 4000 Transmission
Limiter:
[Skip this step if you are calibrating in another manner.]
a) Turn on the Studio Level Control System’s 100% Calibration Tone.
On the Orban 4000 Transmission Limiter, press both of the 4000’s front
panel
TONE buttons.
b)
Adjust the output level of the Studio Level Control System for 100%
modulation of the STL.
c) Adjust the 8400’s Clip Level to indicate –2 dB on the input meters.
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