Nautel VX150, Operation & Maintenance Manual

Page: 62 / 179

VX150 TO VX2 OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
VERSION 1.0 2022-12-08 PAGE 2.2.45
– AGC Limit: enter value between 0 and 160% (default is 120%).
–
AGC Time Constant: enter value between 0 and 1000 ms (default is 300 ms).
• L/R Limiter: This look-ahead limiter can be applied to the signal immediately before the stereo
generator in the exciter. It has a fixed attack-time (and corresponding delay) of approximately
1 s. It can be configured to reduce the signal, if the gain setting is 0 dB or less, or can be used
to perform an AGC function and boost quiet sections of the audio if a positive gain setting is
used. If Enabled, enter the following parameters:
– L/R Hold Time: enter value between 0 and 60 s (default is 5 s).
– L/R Decay Time: enter value between 0 and 60 s (default is 5 s).
– L/R Max Gain: enter value between -30 and 30 dB (default is 12 dB).
• MPX Power Limiter: If Enabled, enter MPX RMS Limit. This limit allows the broadcast signal to
remain in compliance with the MPX power limits as suggested in ITU-R BS.412-9. While the
limiter will keep the transmitter in compliance, it is recommended that adjustment to the pro-
cessing be made in such a way to minimize the reductions performed by the limiter. Otherwise
the signal will not take advantage of the peak modulation capability available.
– MPX RMS Limit: enter value between -12 and 12 dBr (default is 0 dBr).
• Orban Processor: select Enabled or Disabled. If Enabled, enter:
– Orban Preset: select one of the 27 factory Orban presets from the dropdown menu or
create a new Orban Preset from an existing factory preset. See Audio Processing on
page 2.2.49 ) for details on creating custom presets.
NOTE
:
The Orban Audio Processor is an optional item.