Nautel XL12 Technical Instructions

Contents

12 000 WATT AM BROADCAST TRANSMITTERXL12Page 2-1401 January 2002NOTEIf disassembly of an RF power module isnecessary, refer to its service instruction manualfor details.(h) Inspect the main power transformer assemblyfor obvious damage. Verify all attachinghardware is firmly tightened.2.2.6 REASSEMBLY: Install the assemblies/modules which were removed for shipping asfollows:2.2.6.1 Installation of Reference Ground Stud:If the transmitter's reference ground stud wasrepositioned for shipment, install it in the appropriateentry hole at the bottom, rear of the cabinet (seefigure MD-2) as follows:NOTEIf the reference ground stud assembly wasremoved for shipment, it was reassembled andsecured to the cabinet immediately adjacent to itsentry hole.(a) Locate the reference ground stud assembly,disassemble it to the extent necessary to installit by removing two nuts, two split washers, aflat washer and the insulating shoulder washerfrom one end of the stud. The following wiresshould be attached to the other end of the stud:8AWG wire from transformer ground stud6AWG wire from 8-input RF combiner/filter6AWG wire from A23TB12AWG wire from RF output filter(b) Insert the stud in its entry hole and reassembleit as depicted in figure 2-3. Ensure insulatingshoulder washer is positioned in the entry holefrom the exterior side and the flat insulatingwasher is against the interior of the cabinetwall.(c) Ensure all nuts except the nut that secures theexterior safety/reference ground wire arefirmly tightened.Figure 2-3 Ground Stud Assembly Detail2.2.6.2 Installation of Fan Trays : If the four fantrays (A17 thru A20) were removed for shipping,install them as follows (refer to figure MD-1 as anaid in locating and identifying a specific fan tray):(a) Install each fan tray on its mounting supportand slowly slide it in until the fan tray's four pinconnector engages its mating connector.Ensure connectors are fully mated but do notuse excessive force if resistance is felt.(b) Secure each fan tray to its mounting supportusing the retaining pawl fastener on the front ofthe fan tray. Turn fastener clockwise until it isfirmly tightened.2.2.6.3 Installation of RF Power Modules:Install the eight RF power modules, as follows (referto figure MD-1 as an aid in locating and identifying aspecific RF power module):(a) Position each RF power module on itsmounting tray and slowly slide it to the rearuntil the guide pin of its six-pin connector (onrear of module) engages with the matingconnector. Continue to slide RF power moduleto the rear until the connectors are fully mated.