Topband: 1/4 wave vertical

Sun Sep 12 02:21:44 EDT 2004

Mine does have an insulated base, and I am able to use it across the full band.

Pix on my web site: www.aa1k.us

73/Jon AA1K

At 12:44 PM 9/11/04, you wrote:

>>Full-size 1/4 wave with Rohn 25 -- about 11 inches on a face -- is about 128 feet tall. Your tower should be pretty close to that, maybe slightly taller. Common method is to put up 120 feet of tower and then make the remainder a piece of aluminum tubing clamped to the tower, and adjustable up/down to resonate the tower.Fastening with a couple of hose clamps will work.
>>
>>My Rohn 25 for 160 is only 100 feet, and I have a small 6-meter yagi on top that brings it into resonance on 160.
>
>
>Use a base insulator with the tower, and with series feed it takes only a simple L-network to make it match perfectly at any frequency.  Mine is 127' tall, with 120 quarter-wave radials, and works the entire band 1800-2000 kHz.
>
>Don K4KYV
>
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