Orban OPTIMOD-FM 5518, Руководство по эксплуатации

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2-24
INSTALLATION ORBAN MODEL 5518
B) Set
PILOT LVL
to
9%
.
If you have to reduce the setting of the composite level (
C
OMP
1 LV
or
C
OMP
2 LV)
control to accommodate overshoots in the transmission path
following the 5518 (including the transmitter), you may have to increase
the setting of the
P
ILOT
L
EVEL
so that the pilot is still at 9% modulation.
C) Set the peak modulation using the 5518’s built-in calibration tone oscillator.
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 .
D) If your country enforces the ITU-412 multiplex power standard, set
ITU412
to
O
N
.
See step 29 on page 2-22.
E) If you are using the 5518’s pilot reference output to drive a subcarrier genera-
tor, set the
19
K
R
EF
control to the phase relationship between the 19 kHz ref-
erence and the 5518’s pilot tone required by your subcarrier generator. In
most cases, this will be 0 degrees.
F) Press the
Next
button. If you need to apply the 5518’s diversity delay to the
composite outputs, set
D
VRSTY
D
LY
to
I
N
. Otherwise, set it to
O
UT
.
It is not possible to apply the delay to only one of the two composite
outputs.
G) If you are using the diversity delay, set its value using the
D
VRSTY
D
LY
T
RIM
control. The control sets the delay applied to the composite, analog, and digi-
tal outputs when these outputs have been configured to receive delay.
While it is possible to activate or defeat the diversity delay independently
for the analog output, digital output, and composite outputs, it is not
possible to apply different amounts of delay to different outputs.
H) Press the
Next
button. Be sure that
M
ODE
is set to
S
TEREO
and
X
TALK
T
EST
is set
to
O
PERATE
.
Reset these parameters if necessary.
I) You can specify the amount by which the 5518 automatically reduces main
and stereo subchannel modulation to accommodate subcarriers within the
modulation limits specified by the governing authority. See step 17 on page 2-
15.