Yaesu VX-2500U Alignment Manual

VX-2500U Alignment, Page 2/4Vertex Standard Co., Ltd.Alignment Preparation & PrecautionsA dummy load and inline wattmeter must be connected to the main antenna jack in all procedures thatcall for transmission, except where specified otherwise. Correct alignment is not possible with anantenna. After completing one step, read the following step to determine whether the same testequipment will be required. If not, remove the test equipment (except dummy load and wattmeter, ifconnected) before proceeding.Correct alignment requires that the ambient temperature be the same as that of the transceiver and testequipment, and that this temperature be held constant between 20 and 30°C (68 and 86°F). When thetransceiver is brought into the shop from hot or cold air it should be allowed some time for thermalequalization with the environment before alignment. If possible, alignments should be made withoscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be thoroughlywarmed up before beginning.Before beginning, connect the transceiver and PC using the VPL-1 programming cable as described inthe EEPROM Programming chapter, and downloads the EEPROM data from the transceiver to thecomputer.Store this data in a disk file so that it can be saved and retrieved later. Using the table below, programthe channel, CTCSS, and DCS alignment settings for your transceiver version. Upload this file to thetransceiver.Note: Signal levels in dB referred to in this procedure are based on 0 dBm = 0.5 μV (closed circuit).Set up the test equipment as shown for transmitter alignment.Maintain the supply voltage at 13.8V DC for all steps.

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