Just circling back on the fix for my WS150 instrument which is at least 20 years old. You may recall I was getting erratic readings. Removed the sending unit from mast head, plugged into receiver and worked fine. Continuity from mast junction to receiver was fine. Took sending unit home, disassembled and discovered small circuit boards for both the speed and angle. Everything looked OK. Sprayed in electronic cleaner, let dry and reassembled. Attached to receiver, worked fine and calibrated. Yesterday crew went aloft and continuity of wire in mast is fine. Reinstalled sending to mast head - works fine!! Best guess is the sending unit design is a sleeve within a sleeve with an o ring sealer. After many years salt air and condensation fouled something in the circuit boards that became an issue with the longer wire run of the mast given the very small wire gauge and sensitivity of the unit. Apparently the cleaner resolved.
Hope this helps someone else in the future. John and Maryann Legacy III 1982 C&C 34 Noank, CT --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
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