Albums: WA7DUH And WB7CNV Tower Construction

WA7DUH And WB7CNV Tower Construction

Photo essay of tower project at the station of Linda WB7CNV and Steve WA7DUH. They live just outside of the Richland and West Richland city limits in Benton County. Project is to initially erect a 65 ft guyed tower, but to design it for 75 ft or higher. Benton County has an ordinance controlling "communications facilities" (BCC 11.65) which includes "communication towers and antennas." Many of the requirements are exempted for amateur radio towers and antennas not exceeding 65 ft.
138 images Submitted by WA7DUH Steve St... on Sat, 08/04/2012 - 11:19am

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One of three rebar cages for guy stations. Each guy station consists of a reinforced block of concrete 6ft x 4ft x 2ft high buried 4 ft below grade. That long 3/4 in rod is what the guy lines are tied to, and is buried in the concrete block. Each rod will sustain at least 8000 lbs of pull, which is about 4X overkill, since the worst case forces with an 88 mph wind is calculated to be 1000 lbs. Building code in Benton Co. requires survival of 88 mph winds.

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Uploaded on 08/04/2012 - 6:44pm by WA7DUH Steve St... 910 visits

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Uploaded on 08/09/2012 - 7:59am by WA7DUH Steve St... 899 visits

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Tower base hole as specificed will be 4ft x 4ft x 5ft deep. 1st 6 inches is gravel and sand for moisture drainage, followed by 4 cement blocks that hold the bottom rebar grid up into the poured concrete. Tower base legs stick down into the gravel/sand (below the concrete so as to drain any water that may form in the tower legs. Another rebar grid will be embedded in the poured concrete 42 inches above the bottom grid seen in the picture.

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Uploaded on 08/04/2012 - 11:39am by WA7DUH Steve St... 894 visits

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Basic process when digging all the holes-- dirt goes in the cart, Linda (WB7CNV) hauls away.

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Uploaded on 08/09/2012 - 7:59am by WA7DUH Steve St... 890 visits

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Uploaded on 08/09/2012 - 8:00am by WA7DUH Steve St... 882 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 787 visits

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Adam loves Jessica Kabota.

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Uploaded on 08/14/2012 - 5:28pm by WA7DUH Steve St... 749 visits

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Yes, the droop is normal. Note the middle driven element has not been installed in this picture. The tree has to be removed.

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 748 visits

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Uploaded on 09/15/2012 - 7:35pm by WA7DUH Steve St... 746 visits

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Mast installed is 2 inch high strength galvanized steel about 8 feet long.

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Uploaded on 09/25/2012 - 10:57am by WA7DUH Steve St... 740 visits

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The #4 solid wire and the copper strap is also run to the house electrical ground and into the ham shack entrance.

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Uploaded on 09/03/2012 - 6:26pm by admin 736 visits

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 724 visits

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 722 visits

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Assembling an inner guide and support tube that is slid into the large end of the element tubes to provide a consistent diameter for the beryllium tape that must slide in and out.

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 719 visits

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A completed element. 30M & 40M beam operation is achieved by pushing the beryllium tape through the sweep and down the "return" side, creating a resonant folded element. Thus these elements are only 40 feet wide instead of the 62 feet that would be required if they where straight out.

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 703 visits

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Director element EHU and element return fixture.

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 702 visits

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Rubber boots hold the elements into the EHU sockets.

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 689 visits

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The tower base hole. 2x4's above the forms hold up and align the top rebar grid. There is also lower grid sitting on concrete blocks. The tower base that will be submerged in concrete floats in the center of both the top and bottom rebar grids. Temporary guy ropes hold the tower in perfect plumb. Grandson Adam approves.

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Uploaded on 08/14/2012 - 5:24pm by WA7DUH Steve St... 676 visits

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A better view of the rebar cage.

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Uploaded on 08/14/2012 - 5:24pm by WA7DUH Steve St... 670 visits

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How is this supposed to go???

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Uploaded on 09/25/2012 - 10:58am by WA7DUH Steve St... 666 visits