Orban OPTIMOD-FM 5700i, Руководство по эксплуатации

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2-34
INSTALLATION ORBAN MODEL
I) Set the DO S
OURCE
to FM , FM+D
ELAY
, HD or M
ONITOR
.
See the notes in step (10.B) in page 2-31.
J) Navigate to
Setup > I/O C
ALIB
> D
IG
O
UT
2 C
ALIB
.
If you will not be using the
Ratings Encoder Loop-through feature, repeat steps (B) through (I) for DO2. If
you are using the Ratings Encoder Loop-through feature, follow the proce-
dure in step (K) below.
K) If you are using the Ratings Encoder Loop-through feature, perform the fol-
lowing steps (see
Connecting a Ratings Encoder on page 2-8):
a) Set the
DO2 O
UT
S
OURCE
control to
AGC>R
ATINGS
or
L
IMIT
>R
ATINGS
.
You cannot use DO1 for this purpose. This is the essential difference be-
tween DO1 and DO2.
b) Connect your Optimod’s
DO2
output to the AES3 input of the ratings
encoder.
c) Connect the ratings encoder’s AES3 output to your Optimod’s AESid Input
(on the BNC)
.
Depending on whether you choose AGC >R
ATINGS
or L
IMIT
>R
ATINGS
, the
AES3
ID
input is repurposed automatically to drive the input of the FM/HD
split point or your Optimod’s stereo encoder.
AGC
applies a controlled
audio level to the encoder and allows you to use one ratings encoder for
both FM and HD;
L
IMIT
applies the highest possible audio level to the rat-
ings encoder but requires two ratings encoders if you are transmitting
HD.
d) Set the
DO2
output
S
AMP
R
ATE
to
48
kHz.
e) Set the
DO2
output
W
ORD
L
ENGTH
to 24-bit.
•
The Ratings Encoder Loop-through mode has a standard fallback strategy:
To prevent an audio mute, your Optimod will automatically bypass the ste-
reo encoder loop-though and will drive its stereo encoder from the output
of its FM audio processing if there is no valid AES3 signal at your Optimod’s
AES3id Input. When this occurs, ratings encoding is not occurring, so warn-
ings will flash on both the Optimod’s front panel and in PC Remote (if pre-
viously connected to your Optimod). Nevertheless, we recommend moni-
toring the presence of valid ratings encoding via the monitor supplied by
the ratings provider.
L) If you selected FM or FM+D
ELAY
in step (I) above , use a modulation monitor or
modulation analyzer to adjust the
DO 100%
control to make the modulation
monitor read 100% modulation (usually
±
75 kHz deviation).
See the notes in step (10.D) on page 2-31.
M) If you selected HD in step (I) , set the DO 100% control to the maximum peak
output, in units of dBFS, that the following transmission system can accom-
modate.
Once you have set the
DO 100%
control, you may use the
HD L
IM
D
R
control in
the active processing preset to set the final loudness. This is the correct meth-