Thursday, December 13, 2018

160 Meter Shunt Feed Tower System - Vertical Antenna

I wanted to use my tower as a vertical on 160 meters. The tower is an LM-470D motorized 70 foot crank-up supporting a ten foot mast and the following antennas: KT34XA, 40-2CD, 3el 6m, and 80 meter quarter wave sloper This system is designed to allow the tower to be raised and lowered each day. The 3 foot metal stand-off arm is attached at the third level, approximately 50 feet fully extended, approximately 2 feet and the pipe is 15 ft. The only purpose of the pipe is to stabilize the gamma wire so that it doesn't get tangled in the tower when it is raised or retracted. There are other ways to accomplish it, but this system has proven reliable over a 20 year period. If a fixed height tower is used, the pipe is unnecessary. I put the omega match in the barn simply to get it out of the weather. Prior to moving it to the barn, I had it at the base of the tower, first in a tupperware style container and then in a heavy duty irrigation box. In both cases, I had to regularly deal with animals, insects, and moisture. It worked, but it was high maintenance compared to this system, which has been "no maintenance". There is about 100 sq feet of aluminum sheet tied to the base of the tower, which is earth grounded. One 1/2 wave elevated radial is attached at the top of the first section, about 15 feet off the ground. This radial is not grounded and a tap wire runs from the radial to the top feed through insulator. This system has been in use in more or less this configuration for 20 years with about 120 DXCC countries confirmed on the Top Band. See photos of this setup at QRZ.com.

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