Orban Optimod-FM 8300 Operating Manual page 68

2-20
INSTALLATION
A) Press the N button.
EXT
B) [Skip this step if you will not be using the digital output.]
Turn the knob to choose P
J.17 (for a J.17 pre-emphasized output), P
emphasis cascaded with J.17 pre-emphasis), or F
75µs de-emphasis after the processing).
Regardless of the setting of this control, the processing is always inter-
nally pre-emphasized and thus always controls peaks to follow the 50 or
75µs pre-emphasis curve.
13. Set the digital output sample rate.
A) Press the N button.
EXT
B) [Skip this step if you will not be using the digital output.]
Turn the knob to set the Digital O
or 96 kHz.
The internal sample rate converter sets the rate at the 8300's digital out-
put. This adjustment allows you to set the output sample rate to ensure
compatibility with equipment requiring a fixed sample rate. In all cases,
the 8300's fundamental sample rate is 32 kHz, ensuring that the output
bandwidth is always strictly limited to 16 kHz and that the processed sig-
nal can be passed through a 32 kHz uncompressed STL without addition
of overshoot.
14. Prepare to set output levels.
A) Press the N button.
EXT
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

To use program material, press the N
15. 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 8300's C
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
8300's peak limiting system, thereby defining the maximum peak level
that the 8300 will produce. In the U.S., we recommend using 900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.
- (for a 50 or 75µs pre-emphasized output),
RE E
+J17 (for 50 or 75µs pre-
RE
S R
UTPUT AMPLE
button.
ES
button.
O
ORBAN MODEL 8300
(which applies 50 or
LAT
to 32, 44.1, 48, 88.2,
ATE
O
OMPOSITE UTPUT
1 on a