Orban OPTIMOD-FM 5500 Operation Manual page 205

OPTIMOD-FM DIGITAL
You will have to press the N
E) Navigate to Setup > S
F) Set the C
OMP
lation.
G) Navigate to Setup > T
H) Measure the L–R level on the stereo monitor at several frequencies, in units of
dB below 100% modulation. This is the main channel to subchannel crosstalk.
It should not exceed –70 dB, 50-15,000 Hz.
I) Set the T
ONE
this setting and then the Prev button to return to the T
Measure the L+R level on the stereo monitor at several frequencies, in units of
dB below 100% modulation. This is the subchannel to main channel crosstalk.
It should not exceed –70 dB, 50-15,000 Hz.
J) Set the T
ONE
several frequencies, in units of dB below 100% modulation. This is left-into-
right stereo separation. It should not exceed –55 dB, 50-15,000 Hz.
K) Set the T
ONE
several frequencies, in units of dB below 100% modulation. This is right-into-
left stereo separation. It should not exceed –55 dB, 50-15,000 Hz.
L) Set the T
ONE
kHz subcarrier suppression on the stereo monitor. It should not exceed –60
dB.
M) Measure the Pilot Modulation on the stereo monitor. It should read 0%.
N) Set Setup > S
emphasized noise at the left and right outputs of the stereo monitor. It
should not exceed –80 dB below 100% modulation.
O) Repeat steps (D) through (N) for the 5500's C
control instead of the C
C 2 L
OMP VL
P) Using the stereo monitor, verify that pilot tone injection is between 8% and
10% modulation. If it is outside these parameters, adjust it to 9% via Setup >
S E
TEREO NCODER
If the measured pilot level varies by more than a few tenths of percent
from the pilot level indicated, this indicates there may be a problem
elsewhere — either in your measuring setup, or with the 5500.
Q) With the C
OMP
the 5500's composite outputs. Verify that the pilot tone frequency is 19,000
Hz 1 Hz.
10. Optional tests.
A) You can test each GPI (Remote Interface) input for functionality in the obvi-
ous way, by programming a function for it and then verifying that the func-
button to access all of these parameters.
EXT
E
TEREO NCODER
1 L control to make the stereo monitor read 100% total modu-
VL
to access the 5500's tone oscillator parameters.
EST
to L–R. (You will have to press the Next button to access
C
HAN
C to L . Measure the Right level on the stereo monitor at
HAN EFT
to R . Measure the Left level on the stereo monitor at
C
HAN IGHT
to L–R and the T
C
HAN
E > C
TEREO NCODER
OMP
> Next > P L .
ILOT VL
still set to 0.0%, connect a frequency counter to either of
2 L
VL
.
to 5000.0 H
F
ONE REQ
to 0.0%. Measure the de-
1 L
OMP VL
OMPOSITE
control.)
1 L
VL
MAINTENANCE
control.)
F
ONE REQ
. Measure the 38
Z
O 2. (Use the
UTPUT
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