Yaesu VXA-120 Alignment Manual

VXA-120Alignment1VXA-120 AlignmentIntroductionThe VXA-120 is carefully aligned at the factory for the specified performance across the Aircraftand Weather bands. Realignment should therefore not be necessary except in the event of acomponent failure.The following procedures cover the adjustments that are not normally required once the transceiverhas left the factory. However, if damage occurs and some parts subsequently are replaced,realignment may be required. If a sudden problem occurs during normal operation, it is likely dueto component failure; realignment should not be done until after the faulty component has beenreplaced.We recommend that servicing be performed only by authorized Yaesu service technicians who areexperienced with the circuitry and fully equipped for repair and alignment. If a fault is suspected,contact the dealer from whom the transceiver was purchased for instructions regarding repair.Under no circumstances should any alignment be attempted unless the normal function andoperation of the transceiver are clearly understood, the cause of the malfunction has been clearlypinpointed and any faulty components replaced, and realignment determined to be absolutelynecessary. Problems caused by unauthorized attempts at realignment are not covered by thewarranty policyYaesu reserves the right to change circuits and alignment procedures, in the interest of improvedperformance, without notifying owners.The following test equipment (and familiarity with its use) is necessary for complete realignment.While most steps do not require all of the equipment listed, the interactions of some adjustmentsmay require that more complex adjustments be performed afterwards. Do not attempt to performonly a signal step unless it is clearly isolated electrically from all other steps. Have all testequipment ready before beginning, and follow all of the steps in a section in the order presented.Correction of problems caused by misalignment resulting from use of improper test equipment isnot covered under the warranty policy.Required Test Equipmentο Radio Tester with calibrated output level at 200 MHzο In-line Wattmeter with 5% accuracy at 200 MHzο 50-Ω, 10-W RF Dummy Loadο Regulated DC Power Supply adjustable from 3 to 15 VDC, 2Aο Frequency Counter: ±0.2 ppm accuracy at 200 MHzο AF Signal Generatorο AC Voltmeterο DC Voltmeter: high impedanceο VHF Sampling CouplerAlignment Preparation & PrecautionsA 50-Ω RF load and in-line wattmeter must be connected to the main antenna jack in all proceduresthat call for transmission, except where specified otherwise. Correct alignment is not possible withYAESU MUSEN CO., LTD.FCC ID: K66VXA-120EXHIBIT # 11

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