Nautel NV7.5, Operation And Maintenance Manual

Page: 90 / 183

NV10/NV7.5 Operations and Maintenance Manual Operating the transmitter
Page 2-58 Issue 3.4 2016-08-03
Main audio - additional configuration settings:
– Analog Level:
applies to
Left/Right/Mono
source only; enter value
between -12 and +12 dBu, which represents the input voltage level
that yields 100% modulation (typically 4.7 dBu).
– Digital Level:
applies to
Primary Digital, Secondary Digital
and
MPX
Over AES
sources only; enter value between -25.5 and 0 dBFS, with a
typical setting of -4 dBFS (100% modulation value).
– Audio Mode:
select
Mono L, Mono R, Mono L+R
or
Stereo
(applies to
Left/Right/Mono
,
Primary Digital
or
Secondary Digital
sources;
selecting
Stereo
applies a 19 kHz pilot).
– 15kHz Lowpass Filter:
applies to
Left/Right/Mono, Primary Digital,
and
Secondary Digital
audio modes; select
On
(applies 15 kHz low-
pass filter to audio input) or
Off.
– Preemphasis:
select 0 us, 25 us, 50 us or 75 us. This setting applies to
all sources except
MPX
.
– Main Audio Gain Adjust:
applies to L
eft/Right/Mono
source only;
allowable range is -20 to 10 dB. This configuration setting will
increase the incoming signal level and yield a proportional increase in
% modulation.
– MPX Level:
applies to
MPX
source only. Set this parameter level in
Vpp (typically 3.5 Vpp - 100% modulation value). The allowable
range for this setting is between 1-5 Vpp.