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GV5/GV3.5 OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
PAGE 3.2.66 VERSION 0.2 2014-07-23
Main Audio - (see Figure 3.2.45 on page 3.2.65 ) :

Audio Source :
Connects the appropriate exciter input for use. Available options are :
 Left/Right/Mono: 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).
 Primary Digital: this source allows for further configuration via Digital Level, Audio Mode
(Mono L+R, Mono L, Mono R, Stereo), 15kHz Lowpass, Preemphasis, Main Audio Gain Adjust
settings (see below).
 Secondary Digital: this source allows for further configuration via Digital Level, Audio Mode
(Mono L+R, Mono L, Mono R, Stereo), 15kHz Lowpass, Preemphasis, Main Audio Gain Adjust
settings (see below).
 MPX Over AES: this source allows for further configuration via the Digital Level setting (see
below).
 Audio Player Over AES: this source allows for further configuration via the Digital Level
setting (see below).
 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 (typically -4 dBFS for 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 Left/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.
 Audio Backup: When you set
Audio Backup
to
Enable,
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
Setting User
Thresholds, on page 3.2.161 ). The main audio source will be restored as the active source if it
returns and is present for at least one second.