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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Rebar cage for guy station is lowered onto concrete blocks that elevate up off the bottom.

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Uploaded on 08/14/2012 - 5:24pm by WA7DUH Steve St... 652 visits

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Uploaded on 08/14/2012 - 5:24pm by WA7DUH Steve St... 554 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... 670 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... 663 visits

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Adam loves Jessica Kabota.

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Uploaded on 08/14/2012 - 5:28pm by WA7DUH Steve St... 743 visits

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Time to pour concrete. The concrete truck can only reach one guy station, so a motorized wheel barrel is used to transport 8 yards of concrete into the main tower and guy station holes.

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Uploaded on 08/14/2012 - 5:29pm by WA7DUH Steve St... 579 visits

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Yea-- this is the way to handle concrete.

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Uploaded on 08/14/2012 - 5:30pm by WA7DUH Steve St... 539 visits

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Guys from Speedy Angeles Concrete, LLC out of Pasco WA do the work. They have the equipment and muscle, and did the job for a good price.

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Uploaded on 08/14/2012 - 5:30pm by WA7DUH Steve St... 535 visits

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Uploaded on 08/14/2012 - 5:30pm by WA7DUH Steve St... 573 visits

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WB7CNV (Linda) bows properly to the tower gods.

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Uploaded on 08/14/2012 - 6:13pm by WA7DUH Steve St... 532 visits

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Trenching between the tower base and the ham shack entrance. The picture doesn't really show the 18% downslope here, and the trencher was stuck and rolling into one of the deck support posts. Come-alongs are keeping the trencher from taking out the deck post plus the tractor is extracting.

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Uploaded on 09/03/2012 - 6:25pm by admin 515 visits

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Uploaded on 09/03/2012 - 6:25pm by admin 515 visits

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One of three ground tower ground rods. The are each connected to a tower leg with both a #4 solid copper wire (per NEC) PLUS a 1 1/2 inch low RF impedance copper strap. Once connections are made, the ground rod is then driven down so it is at least 6 inches below grade.

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Uploaded on 09/03/2012 - 6:26pm by admin 571 visits

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Uploaded on 09/03/2012 - 6:26pm by admin 586 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 730 visits

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Here is the house ground rod as we found it. It doesn't meet code. Only one ground was found or wired into the electrical panel, but code requires two, with at least 6ft separating them. The solid copper wire is also too small, and the one rod was not 6 inches below grade. So we fixed that up.

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Uploaded on 09/03/2012 - 6:26pm by admin 523 visits

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#4 solid copper over to the house electrical entrance ground. Found more irrigation, Spinkler valve control cable (run in water pipe PVC) and some Romex (indoor only) that the previous owner had run to some outdoor lights. Gotta fix all that.

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Uploaded on 09/03/2012 - 6:26pm by admin 477 visits

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Driving those ground rods down at least 6 inches below grade with a power hammer.

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Uploaded on 09/03/2012 - 6:26pm by admin 546 visits

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Each of the 3 tower grounds are out abot 7 feet from each tower leg, with #4 solid copper and 1 1/2 inch copper strap back to the tower, over to the house electrical ground and down to the ham shack. Two inch rigid non-metal conduit is also buried in the trench to hold 4 runs of LMR-400 coax.

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Uploaded on 09/03/2012 - 6:26pm by admin 533 visits

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Uploaded on 09/03/2012 - 6:26pm by admin 461 visits

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A view of the trench heading down to the ham shack. That white bottle in the picture is copper anti-seize/anti-corrosion goop that is used liberally on ALL copper-to-copper connections.

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Uploaded on 09/03/2012 - 6:27pm by admin 596 visits

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Uploaded on 09/13/2012 - 7:03pm by WA7DUH Steve St... 490 visits

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Uploaded on 09/13/2012 - 7:03pm by WA7DUH Steve St... 520 visits

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Uploaded on 09/13/2012 - 7:03pm by WA7DUH Steve St... 660 visits

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It looks like coax in this picture, but it is Phillystran, a non-conductive arimid fiber guy wire. Good for about 4,000 lbs pull.

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Uploaded on 09/13/2012 - 7:03pm by WA7DUH Steve St... 646 visits