Nautel NX15, Operation And Maintenance Manual

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NX15/NX25 Operations and Maintenance Manual Operating the transmitter
Page 2-52 Issue 6.0 2019-01-31
Understanding the preset tabs
The
Presets
page consists of tabs across the top with functions on the left-side and parameters
displayed in the center and right-side of the window. A separate display appears for each of the
following tabs:
General
( Figure 2.35 on page 2-50 )
•
Preset Name
-
this identifies the current preset. You must load a preset to directly edit this field (see
“Loading Presets” on page 2-52 ).
•
Output Power -
set the output power level (in kW)
•
Overall Mode -
set the overall transmission mode. Options are:
– Analog AM: transmits a carrier, amplitude modulated with audio. Audio settings are selected in the
Analog Settings tab.
– DRM: transmits a DRM OFDM signal using the I/Q stream from a DRM modulator connected to the
desired AES input. Modulation settings are selected in the Digital Settings tab.
– DRM+AM: Also known as simulcast, transmits a carrier, amplitude modulated with audio and a
DRM OFDM signal in either an upper or lower channel. AM settings are selected in the Analog
Settings tab and DRM settings are selected in the Digital Settings tab. In this case, if balanced
analog audio input is used for AM modulation, AES2 input (Digital AES input) must be used for I/Q
stream from the DRM modulator. If AES is used for AM modulation, either AES input may be used
for either input (AM modulation and DRM I/Q stream).
– IBOC: transmits an AM IBOC standard signal (carrier, amplitude modulated with audio and upper
and lower sidebands of OFDM IBOC carriers). Requires an Exgine to be installed in the transmitter
that is receiving modulation information from and Exporter. Both the AM signal and IBOC carriers
are received in the I/Q stream from the Exgine. Modulation settings are selected in the Digital
Settings tab.
– IBOC+AM: The transmitted signal in this mode is identical to IBOC mode. In this mode, the
information for the OFDM carriers is received from the Exgine and the AM information is received
through an audio input in the transmitter. In this mode, the AM audio signal cannot be connected
to AES2; it must be connected to Bal Anlg Audio or AES1. AM settings are selected in the Analog
Settings tab. IBOC carrier modulation settings are selected in the Digital Settings tab.
• Configuration -
select the pre-correction configuration (see “Precorrection Settings page” on page 2-
104 )