Nautel NX100, Preinstallation Manual

Page: 66 / 99

NX100 Pre-installation Manual Planning audio inputs
Issue 3.2 2017-03-31 Page 7-1
Section 7: Planning audio inputs
The NX100 supports all current forms of AM broadcasting. This section describes the requirements
associated with the audio feeds to the transmitter.
• Analog inputs
– Balanced (mono)
– AES/EBU
• Digital inputs - see page 7-2
– IBOC - see page 7-2
– DRM - see page 7-2
• Other considerations - see page 7-3
– Frequency synchronization signals - see page 7-3
– Audio Player via USB - see page 7-3
– DRM Simulcast - see page 7-3
Analog inputs
The transmitter does not have extensive audio processing capabilities. Use an external audio
processor to ensure that the audio source material is processed properly. An audio processor will
adjust the dynamic range, loudness, frequency response and symmetry parameters to suit the
transmission system. Carefully control the peak levels.
For monaural applications, the audio may be processed to provide up to 135% positive peak program
modulation, with a 100 kW RF carrier at the nominal ac voltage.
Refer to the Operating section of the NX100 Operations and Maintenance Manual for an example of
setting an analog preset.
The NX100 accepts the following analog inputs:
Balanced (mono)
Modulating audio must be applied from an external source to
BALANCED ANALOG AUDIO
XLR
connector J12 on the control/interface PWB (A11A1). The audio source must be balanced, able to
drive a 600

load, and produce a level between -10 and +12 dBm for 100% modulation.
Only one analog input is provided. Program content from the input is applied to both exciters.