NV15/NV20 Operations and Maintenance Manual
Operating the transmitter
Page 2-52
Issue 3.2 2013-10-01
Figure 2.37: Presets - SCA
SCA - (see
Figure 2.37
)
:
•
MPX SCA
Connector
(
J7:A for SCA1, J7:B for SCA2
)
for use with an externally gen-
erated SCA; select
Enabled
or
Disabled.
When enabled, all the selections
listed below are active.
–
Input Level:
signal level that represents 10% modulation. Enter a value
between 1 and 5 V p-p (typically 2.83 Vpp).
•
SCA Reduction
Attenuation applied to the SCA input; set between 0 and 20% (used to
reduce the modulation level of the main audio when SCAs are enabled;
typically, for every 2% of SCA modulation, the main audio modulation
must be reduced by 1%).
•
Internal SCA1/2
Enable or disable the appropriate internal SCA (
SCA1
or
SCA2
). When
enabled, the settings listed below are active for the associated SCA signal
(1 or 2).
–
SCA1 or SCA2 Injection Level:
enter value between 0 and 20% (typically
10%); this level is added to the composite baseband signal.
–
SCA1 or SCA2 Frequency:
enter value between 20 and 100 kHz (typically
set to 67 kHz or 92 kHz).
–
SCA1 or SCA 2 Input Level:
enter value between -12 and +12 dBu, which
represents the input voltage level that yields 10% modulation (typically
4.7 dBu).
Summary of Contents for NV15
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