Nautel NX100 Preinstallation Manual

Also see for NX100: Installation manual Manual Troubleshooting manual Manual

Nautel NX100 Preinstallation Manual Manual pdf 68 page image

NX100 Pre-installation Manual Planning audio inputsIssue 3.2 2017-03-31 Page 7-3Other considerationsFrequency synchronization signalsYou can apply a 10 MHz synchronization signal from an external source or using the optional GPSsync PWB, which can be installed in the transmitter.Optional GPS sync PWBA GPS sync PWB can be purchased that is capable of driving a 3.3 V or 5 V GPS antenna. If theoptional GPS sync PWB is installed, it provides the necessary 10 MHz, 1 PPS and 1 kHz sync signalsused by the exciter(s). The exciter uses these signals to synchronize the transmitter to this GPSreference. The GPS sync PWB connects to dual D-sub connector J5 of the control/interface PWB.Externally sourcedIf you are using an externally generated 10 MHz signal (such as a GPS clock signal) for use as thereference frequency for the RF drive (carrier frequency), connect it to the 10 MHz SYNC BNCconnector J8 on the control/interface PWB. The external 10 MHz frequency reference must:– remain stable at 10 MHz within ± 20 Hz– have a peak-to-peak amplitude of between 2.2 V and 8.0 V (sine wave or square wave)– be spectrally pure, since spurs may pass through to the transmitter output.Audio Player via USBThere is provision to configure the transmitter’s audio player feature to use an external USB deviceconnected to a USB port on the single-board computer (SBC). The files on the USB device (e.g., mp3files) will act as the audio playlist. Refer to the Operations and Maintenance Manual for details on usingthe Audio Player’s Playlist feature, available through the AUI.DRM SimulcastFor broadcasting in DRM simulcast, Nautel recommends applying the analog modultion inputdirectly to one of the transmitter’s audio inputs, in addition to the digital I/Q over AES stream beingapplied to one of the transmitter’s AES inputs from the DRM modulator. This allows the transmitterto effectively manage its own power control and protection, as it normally would.NOTE: Do not connect the analog modulation source to a DRM modulator and apply a combinedanalog and DRM signal to the transmitter. If the analog is combined with the DRM carriers by theDRM modulator and applied to the transmitter as a single combined I/Q over AES stream, some ofthe normal transmitter protections will not function properly.