Orban OPTIMOD-FM 5700i, Operating Manual

Page: 75 / 335

OPTIMOD-FM DIGITAL INSTALLATION
2-19
and Digital Output #1 to drive the HD input of your transmission system.
a) Press the
Next
button.
b) Turn the knob to assign
FM
or
FM+D
ELAY
as the source driving Digital
Ouput #2.
FM+D
ELAY
is used in HD Radio installations where the 5700i supplies the
diversity delay.
c) Press the Next button.
d) Turn the knob to assign HD as the source driving Digital Ouput #1.
If your unit is an 5700iFM, HD will not be available as an option. In this
case, you may wish to configure Digital Output #1 as a second FM output
to drive a standby exciter (by choosing
FM or FM+D
ELAY
)
. In this case, you
must configure Digital Output #1 to be flat or pre-emphasized outside of
Quick Setup.
B) Set Digital Output #2 to be flat or pre-emphasized.
See the notes in step (10.B) above.
a) Press the Next button.
b) [Skip this step if you will not be using the digital output to drive your
analog FM transmitter.]
Turn the knob to choose
P
RE
-
E
(for a 50 or 75µs pre-emphasized output),
J.17
(for a J.17 pre-emphasized output
), P
RE
+J17
(for 50 or 75µs pre-
emphasis cascaded with J.17 pre-emphasis), or
F
LAT
(which applies 50 or
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.
C) Set Digital Output #2 sample rate.
a) Press the Next button.
b) [Skip this step if you will not be using Digital Output #2.]
Turn the knob to set the Digital O
UTPUT
S
AMPLE
R
ATE
to 32, 44.1, 48, 88.2,
or 96 kHz.
The internal sample rate converter sets the rate at the 5700i’s digital
output. This adjustment allows you to set the output sample rate to ensure
compatibility with equipment requiring a fixed sample rate. In all cases, the
5700i’s fundamental sample rate is 64 kHz. To pass the processed signal
without addition of overshoot, the STL must be flat to 17 kHz. If you are
using a digital STL, this usually requires using a sample rate of 44.1 kHz or
higher in the STL. 32 kHz will add considerable overshoot.
If the
DO S
YNC
and
P
ILOT
S
YNC
controls have been previously set in the
IO / D
IGITAL
O
UT
calibration screens, the O
UTPUT
S
AMPLE
R
ATE
control might