SOUTHERN AVIONICS COMPANYModel SA100 Dual 4-5Installation and Operation4.2 Local Radiobeacon Control UnitThe Local Radiobeacon Control Unit is unit 5 in the SSC or SA Series dual transmitter system.1. Set the power switch on the Local Radiobeacon Control Panel to OFF, and ensure that allinput power has been removed.2. Unfasten the four screws holding the front panel closed to expose the motherboard and cardassembly.3. Check each of the printed wiring boards and relays to insure that they are fully seated.4. Check the supply voltage programming switch on the Autotransfer Logic Board and set it to115 VAC or 230 VAC to correspond to the transmitter AC primary supply voltage.5. Refer to figures "Local Radiobeacon Control Unit Overall Schematic," Input/Output TerminalBlocks," and the "Interconnecting Wire Diagram" to make necessary electrical connections.6. Refer to sections "Transmitter Installation" and "Coupler Setup" and complete.7. Complete Antenna Tune-Up Section. To apply AC power to the transmitter in step 2, placethe Local Radiobeacon Control Panel power switch in the ON position. The followinginitializing steps may also be required.8. Press the Primary Transmitter Select switch to the Transmitter 1 position. Press theTransmitter ON/OFF switch to the ON position. Press the Reset pushbutton on the Local9. Radiobeacon Control Panel.10. Complete Transmitter Tune-Up Section.11. Attach the Serial Data Link to terminals 1, 2 and 3 on the Remote Control terminal blocklocated on the Local Control Motherboard. See figure "Local Control Motherboard Diagram."12. Leave power applied to the Local Radiobeacon Control Panel while installing the RemoteRadiobeacon Control Panel. Place the Remote Enable switch in the ENABLE position.NOTE: DC current flowing in the Serial Data Link must not exceed 3 mA or saturation of theModem coupling transformer will occur. If current exceeds 3 mA DC, install a DC blockingcapacitor in the data link.4.3 Remote Radiobeacon Control Panel1. Check the supply voltage programming switch on the Remote Control Motherboard and set itto 115 VAC or 230 VAC to correspond to the available AC supply voltage.2. If the optional modem PWB is used, attach the Serial Data Link to terminals 1 and 2 (Tip andRing) of Line Input terminal block TB1. This is located on the Remote Motherboard.NOTE: DC current flowing in the Serial Data Link must not exceed 3 mA or saturation of theModem coupling transformer will occur. If current exceeds 3 mA DC, install a DC blockingcapacitor in the data link.
