Orban OPTIMOD 6200, Operating Manual

Page: 67 / 195

OPTIMOD INSTALLATION
2-25
This setup maximizes the 6200’s signal-to-noise ratio. If the clip level is set
too low, the 6200’s analog-to-digital converters will overload and distort on
program peaks. If the clip level is set too high, the signal-to-noise ratio will
suffer. Use care and attention in setting this adjustment.
If you are adjusting the 6200 during normal programming, and cannot inter-
rupt or distort the program to play program material from your studio at a
much higher level than normal, follow the directions to:
•
Calibrate while on air with normal programming, step (A) page 2-25.
If you are able to interrupt or distort normal programming, you can achieve
calibration that is more precise. Follow the directions to:
•
Calibrate with unprocessed audio, step (B), page 2-25, 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 2-25, or
•
Calibrate with an Orban 464A Co-Operator, step (D), page 2-26,
as appropriate.
Note that in this step, you are calibrating to the maximum absolute peak level;
this is quite different from the maximum peak indication of the studio meters.
A)
Calibrate while on air with normal programming.
[Skip this step if you are calibrating in another manner.]
a)
Adjust the
AI CLIP
so that program peaks indicate approximately –10dB on the
input meters.
Observe the meters on the 6200 screen for a long period; be sure to observe
live announcer voice. If this setting is misadjusted, distortion will result.
0dB indicates input clipping on the 6200. These meters should never peak as
high as 0dB with program material.
B) Calibrate with unprocessed audio:
[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 6200’s
AI CLIP
so that the program peaks reach to approximately
–2dB on the input meters.
0dB indicates input clipping on the 6200. These meters should never peak as
high as 0dB with program material.
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: