Automatic audio change-over system with RDS recoding. This unit realizes an automatic audio changeover between a stereo signal coming from a satellite receiver or other source and a MPX composite signal coming from a STL receiver. Any of the two audio sources can be selected as the main source and the unit will continously monitor its parameters, including audio level, pilot level, PI code and RDS quality (only audio level monitoring applies to the stereo audio source). When any of the user-defined alarm thresholds are exceeded on the main source, the unit will switch to the backup source, getting back to the main, once it recovers. A GSM modem can be fitted internally for remote control and alarms signaling through SMS. A unique feature of this unit is the capability of suppressing the incoming RDS signal and superimposing a new, internally generated, one or replacing its AF tables only. In this latter case, all other preexistent dynamic services will pass through the unit unmodified. RDS Encoder Internal time base or automatically locked, using DSP-based PLL and filters, to the external MPX pilot carrier. 0A and 2A blocks 24 user defined PS strings 24 user defined RT strings AF mode A and mode B with 25 AF tables RDS subcarrier level injection 2KHz-12KHz STEREO coder Crosstalk >60dB Input sensitivity -10dBm / +15dBm adjustable in 0.5dB steps Pilot level and phase adjustable from front panel MPX Input Impedance 10Kohm Accepted level 0dBm (2.2Vpp / 775mVRMS) MPX Output 3 independent buffered outputs Outputs will be bypassed on MPX input in case of equipment failure Level 0dBm + 1dB / -3dB adjustable through rear panel trimmer Remote control and connectivity GPIO board for switch control and alarms GSM Modem (optional) for data connection and SMS Ethernet - TCP/IP RS-232 User interface LCD Display 2 x 20 digit Keyboard for menu navigation and parameters editing Indication Led: main channel on air, backup channel on air, alarm, RUN (equipment is functioning properly) Configuration software Window XP, Vista, Windows 7, Windows 8.1, Windows 10 compatible Power supply 100 - 240VAC 50/60Hz 18/32VDC Physical dimensions 1 rack unit 19" 44mm x 483mm x 200mm Weight 2Kg