OPTIMOD-FM INSTALLATION
2-29
12. Complete Quick Setup.
A) Locate to the Finished screen (System Setup: Quick Setup 10).
B) Press Escape once to return to the System Setup screen, or twice to display the Me-
ters screen. Or, press the control knob to display the pop-up Menu.
Quick Setup is finished, unless your country is required to meet ITU-R 412-
7 requirements (see next step).
13. If you are required to meet the “multiplex power” limitations of ITU-R
412-7 in your country, activate the 8400’s ITU-R 412 controller.
[Skip this step if your country does not enforce ITU-R 412. At the time of this
writing, it is only enforced in certain European countries.]
A) Navigate to the Input/Output: Utilities screen.
a) Press the control knob to display the pop-up Menu.
b) Turn the knob to highlight Input/Output, and press the knob.
c) Locate to the Input/Output Utilities screen.
B) Set the Multiplex Power Threshold to “0.0 dB.”
If your transmission system introduces overshoot in the signal path after the
8400 (including the transmitter), set the
Multiplex Power Threshold so that it
equals the amount of peak overshoot (in dB) in the transmission system. If
you do not do this, the 8400’s ITU-R 412 controller will set the average
multiplex power too low.
The easiest way to measure system overshoot is to turn the multiplex power
controller off temporarily. Then set the 8400’s output level, using its built-in
400Hz reference tone, so that the transmitter produces ±75 kHz deviation.
Finally, play program material with lots of high frequency energy and bass
transients (like bright rock music with heavy kick drum) and observe the
peak deviation produced by the program material. The overshoot is the
amount (in dB) by which the deviation with program material exceeds ±75
kHz deviation.
If your country does not enforce ITU-R 412-7, the
Multiplex Power Thresh-
old
should be set to OFF.
The following material provides detailed instructions on how to set up the 8400. If
Quick Setup does not fully address your setup needs, or if you wish to customize
your system beyond those provided with
Quick Setup, then you may need the addi-
tional information in the sections below. However, for most users, this material is
only for reference, because
Quick Setup has enabled them to set up the 8400 cor-
rectly.
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