Orban OPTIMOD-FM 5700i, Руководство по эксплуатации

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2-20
INSTALLATION ORBAN MODEL
be defeated. To set this control internally you must have the P
ILOT
S
YNC
set to Internal and the
DO S
YNC
set to
P
ILOT
S
YNC
.
D) Set Digital Output #1 sample rate.
a) Press the
Next
button.
b) [Skip this step if you will not be using Digital Output #1.]
Turn the knob to set the Digital
O
UTPUT
S
AMPLE
R
ATE
to 32, 44.1, 48, 88.2,
or 96 kHz.
12. Set output levels.
A) Prepare to set output levels.
a) Press the
Next
button.
b) You can use either program material or tone to set the output level (and
thus, the on-air modulation).
•
To use tone, press the Y
ES
button.
•
To use program material, press the N
O
button.
B) Set the composite output level.
[Skip this step if you will not be using the composite output(s).]
a) Observe the modulation produced by the 5700i’s Composite Output 1 on a
modulation monitor or modulation analyzer. Turn the knob to make the
modulation monitor read 100% modulation (usually
±
75 kHz deviation).
If you are using program material, make sure that the program material
is loud enough to produce peaks of frequent recurrence that hit the
5700i’s peak limiting system, thereby defining the maximum peak level
that the 5700i will produce. In the U.S., we recommend using 900
μ
s peak
weighting on the peak modulation indicator, as permitted by F.C.C. rules.
This will cause the monitor to ignore very low energy overshoots and will
result in the highest peak modulation permitted by law.
In other countries, use a peak-indicating instrument as specified by the
regulatory authority in your country.
If you are required to obey the multiplex power limits specified by ITU-R
BS412-9, you may seldom see peaks hitting
±
75 kHz deviation. In this
case, we advise you to set the output level using the 5700i’s reference
100Hz tone.
b) Press the
Next
button and repeat for
C
OMPOSITE
O
UTPUT
2
.
C) Set the Digital Output #2 level.
a) Press the
Next
button.
b) [Skip this step if you are not using Digital Output #2.]
Turn the knob to set the desired digital output level corresponding to
100% modulation, in units of dB below full-scale.