CHAPTER 16 |
103
SYSTEM MENU
Main Outputs Menu
The
System > I/O Options > Main Outputs Menu
determines the audio source is present on rear-panel Analog and
Digital output connections and provides output levels for each.
♦
The
Digital:
output sources include
AM Digital Ouptut, HD, Headphone Out
and
Speaker Out.
♦
Analog Out:
output sources include
AM TX Output, HD, Headphone Out
and
Speaker Out.
♦
The corresponding
Level
sliders adjust the output levels when set to
HD, Headphone Out or Speaker Out.
They will be grayed-out for the AM transmitter output choices. See
AM Output Options
below.
AM Options Menu
Navigating to the
System > I/O Options > AM Options
menu displays all of the AM-specific settings.
♦
The
Pre-emphasis
dropdown control allows you choose an output with no pre-emphasis (flat), the
standard NRSC profile, 50us, or 75us.
♦
The
High pass
dropdown control sets the frequency below which audio will be filtered while the
Low pass
control sets the frequency above which audio will be filtered.
♦
If the symmetry of the incoming program material normally has significant negative peaks, using the
Invert Input
control will invert the signal and help match the input audio to the processor. The
Invert
Output
control works in much the same way but on the output side to help match the output of the
processor with the transmitter.
♦
The
Positive Peaks
slider sets the maximum positive peak level. Due to the nature of AM modulation, it is
possible to allow up to 125% modulation for positive peaks, while negative peaks must be kept at or below
100% to prevent carrier loss as illustrated below: