Orban OPTIMOD-FM 8500S, Руководство по эксплуатации

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2-30
INSTALLATION ORBAN MODEL
Alternately, you can use the 8500S’s built-in calibration tone oscillator. To
do this:
a) Navigate to Setup > T
EST
.
b) Set the M
ODE
to T
ONE
.
c) Set T
ONE
F
REQ
to 100 H
Z
.
d) Set
T
ONE
L
VL
to 91%. (This assumes you are using 9% pilot injection, in
which case the peak level at the composite output is now the same as the
maximum peak level under program conditions.)
e) Press the
Next
key.
f) Set
T
ONE
C
HAN
to
L+R
.
g) Verify that P
ILOT
is O
N
.
h) Adjust the relevant output level control so that your peak modulation is
100%.
i) When you have finished with the tone, set the M
ODE
to O
PERATE
.
I) You can specify the amount by which the 8500S automatically reduces main
and stereo subchannel modulation to accommodate subcarriers within the
modulation limits specified by the governing authority. See step 2 on page 2-
23.
10. Set analog output and configuration level.
A) Navigate to Setup > I/O C
ALIB
> A
NLG
O
UT
C
ALIB
> AO P
RE
-E . Set the analog
output pre-emphasis to P
RE
-
E
(for pre-emphasis) or F
LAT
.
If you will use the analog output to drive a stereo encoder,
P
RE
-
E
pro-
vides the best performance because the stereo encoder does not have to
restore the pre-emphasis. (Its magnitude and phase response may not
perfectly complement that of the deemphasis applied by the 8500S to its
processed output when the 8500S’s output is set
F
LAT
. This can introduce
overshoots in the overall transmission chain.) However, if you cannot de-
feat the pre-emphasis in your stereo encoder or if you will use the analog
output for monitoring, set the output
F
LAT
.
If you are sending the analog output of the 8500S through a digital link
that uses lossy compression (like MPEG, APT-X, or Dolby), set the output
F
LAT
.
Lossy codecs cannot handle pre-emphasized signals.
If you are going to use the analog output for headphone monitoring [see
step (B) below], set the output
F
LAT
.
B) Set the
AO S
OURCE
to
FM
,
FM+D
ELAY
,
or
M
ONITOR
.
FM: This produces a fully peak-controlled output suitable for driving a
transmitter.
FM+Delay: This produces a fully peak-controlled output suitable for driv-
ing a transmitter. Up to 16 seconds of diversity delay can be applied to
this output. To set the amount of delay, refer to step (9.F) on page 2-29.