Nautel XR12 Installation Manual

Also see for XR12: Troubleshooting manual Operation and maintenance manual Preinstallation manual

XR12 Installation Manual Audio and IBOC inputsIssue 3.0 2009-07-15 Page 8-1Section 8: Audio and IBOC inputsThis section describes requirements associated with audio feeds to the XR12 transmitter. This sectionincludes the following topics:• Analog audio• IBOC input• Audio configuration - see page 8-2Analog audioModulating audio must be applied from an external source. The RF drive source configurationdetermines the audio requirements. The audio source must be balanced, able to drive a 600 Ω load,and have a level between 0 and +12 dBm for 100% modulation.Only one analog input is provided. Program content from the input is applied to either one or bothexciters when they are configured for analog operation.The transmitter does not have any audio processing capability. Use an external audio processor toensure that the audio source material is processed properly. The audio processor adjusts the dynamicrange, 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 145% positive peak programmodulation, with a 10 kW RF carrier at the nominal ac voltage.IBOC inputIn Band On Channel (IBOC) audio is processed outside the XR12 in the customer’s IBOCgenerator – a separate, standalone system that feeds an IBOC signal to the transmitter’s mag andphase ports.• Position the IBOC equipment close to the transmitter to minimize cable lengths.• IBOC audio must be AES-EBU digital. Refer to the NE-IBOC documentation for moreinformation.