Nautel NX15, Operation And Maintenance Manual

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NX15/NX25 Operations and Maintenance Manual Operating the transmitter
Issue 6.0 2019-01-31 Page 2-55
For IBOC and IBOC+AM modes:
• IBOC Service Mode -
In IBOC mode only, select the MA1(hybrid) or MA3 (all-digital) service mode
• Enhanced Carriers -
select Low, High or Disabled
• Upper Primary Level Adjust -
Adjusts the power level of the upper sideband within the range of -30 dB
and -+10 dB. Should be zero by default.
•
Lower Primary Level Adjust -
Adjusts the power level of the lower sideband within the range of -30 dB
and -+10 dB. Should be zero by default.
• Analog Gain -
In IBOC mode only, selects a linear scale factor (between 0 and 4) that scales the analog
modulation level with respect to the carrier level. Normally set to 1.0 with a 0 dBFS audio signal applied
to the Exporter.
• Digital Carriers -
select On or Off
• Analog Bandwidth -
In IBOC mode only, select 5kHz, 8kHz or Bypassed
• Analog Transmission -
In IBOC mode only, select On or Off
Audio Loss
( Figure 2.42 on page 2-58 )
• Mod Loss Timeout -
Determine if an action should be taken on the loss of a modulating signal. Select
Enabled or Disabled. Default is Disabled. If Enabled, the following sub-fields appear:
– Action: select the action to take on the loss of a modulating signal. Select Alarm Only (no resulting
action), Inhibit (inhibits the RF output, fans and B+ voltage until the audio returns) or Change
Preset (changes the active preset).
– Mod Loss Preset: displayed only if Action is set to Change Preset. Select the preset from the drop-
down list that will activate upon the loss of a modulating signal.
– Timeout Minutes: sets the delay, in minutes, between audio loss detection and the resulting action.
Enter a value between 0 and 255 minutes.
– Timeout Seconds - sets the delay, in seconds, between audio loss detection and the resulting
action. Enter a value between 0 and 59.9 seconds
– Threshold - sets the threshold for audio loss detection. Enter a value between 0 and 100%