VARIOMETER_TUNED_RADIO

Published:2009/6/24 4:54:00 Author:May | From:SeekIC

The two fixed coils of the variometer, L1 and L3, are wound on an S)G-inch-long piece of 1-inch-diameter plastic pipe (its outer diameter is about 1 1/4 inches). Each coil is 2 1/4 inches long. The num-ber of turns is not critical, but 86 tightly wound turns of #22 enameled wire were used. When winding the coils, make sure you start at a point that will allow them to be placed 2 inches apart on the pipe. Drill holes in the pipe and run the leads of the coils out the end of the pipe that is closest to each.The movable coil, L2, is wound on a piece of 1 1/2-inch plastic pipe (its outer diameter is about 1 7/8inches). The winding is 2 inches long. Like L1 and L3, the actual number ofwindings of this coil are not critical, as long as the winding is approximately the right length.



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