Nautel NV30LT-N, Руководство по эксплуатации и техническому обслуживанию

Страница: 74 / 226

NV30LT-N OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
PAGE 3.2.56 VERSION 0.1 2015-03-01
Main Audio - (see Figure 3.2.38 on page 3.2.55 ) :

Audio Source :
Connects the appropriate exciter input for use. Available options are :
 Analog Left/Right: this source allows for further configuration via Analog Level, Audio Mode
(Mono L+R, Mono L, Mono R, Stereo), 15kHz Lowpass, Preemphasis, Main Audio Gain Adjust
settings (see below).
 MPX: this source allows for further configuration via the MPX Level setting (see below).
 AES/EBU 1: this source allows for further configuration via the Digital Level, Audio Mode
(Mono L+R, Mono L, Mono R, Stereo), 15kHz Lowpass, Preemphasis, Main Audio Gain Adjust
settings (see below).
 Audio Player -> AES: this source allows for further configuration via the Audio Player Source
setting (see below).
 MPX Over AES: this source allows for further configuration via the Digital Level setting (see
below).
 Analog Level: applies to Analog Left/Right 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 AES/EBU 1, Audio Player -> AES and MPX Over AES sources only;
enter value between -25.5 and 0 dBFS (typically -4 dBFS for 100% modulation value).
 Audio Mode: select Mono L, Mono R, Mono L+R or Stereo (applies to Analog Left/Right, AES/
EBU 1or Audio Player -> AES sources; selecting Stereo applies a 19 kHz pilot).
 15kHz Lowpass Filter: applies to Analog Left/Right, AES/EBU 1or Audio Player -> AES audio
sources; 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
and MPX over AES sources.
 Main Audio Gain Adjust: applies to Analog Left/Right, AES/EBU 1or Audio Player -> AES
audio sources 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 and 5 Vpp.
 Audio Backup: When you set
Audio Backup
to
On,
you can select a backup
Audio Source
and edit various parameters for the backup audio similarly to the main audio described above.
The backup audio source, if enabled and present, will replace the main audio source if the
main audio level is less than its user-determined trip threshold (see
System Settings, on page
3.2.125 ). The main audio source will be restored as the active source if it returns and is
present for at least one second.