Nautel XR12 Installation Manual

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

XR12 Installation Manual Commissioning tasksIssue 3.0 2009-07-15 Page 11-525. Turn off the audio signal generator and increase the output level of the audio signalgenerator until a modulation depth of 100% is attained, as indicated on the modulationmonitor. The audio signal generator's output level should be +10 dBm.26. Verify that the RF output's modulation envelope is acceptable.27. If the program audio can be set to +10 dBm when 100% modulation is required, it isrecommended the AUDIO GAIN potentiometer on the interphase PDM driver PWBs be leftat the factory setting.28. If the program audio cannot be set to +10 dBm when 100% modulation is required, theAUDIO GAIN potentiometer on the remote interface PWB must be reset as follows:– Determine the program audio level (in dBm) that will be applied when 100% modulationis expected. (It must be between 0 dBm and +12 dBm.)– Set the audio signal generator's output to the level that will be applied by the programaudio when 100% modulation is expected.– Adjust the AUDIO GAIN potentiometer on the remote interface PWB for 100%modulation, as indicated on the modulation monitor.29. Set the output level of the audio signal generator to zero (turned off).30. Turn off the RF power stage: press and release the RF OFF switch. The RF OFF lamp will turnon and the RF ON lamp will turn off.31. Disconnect the audio signal generator from TB2-1(+) and TB2-3(-) on the remote interfacePWB.