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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Uploaded on 10/10/2012 - 5:40pm by WA7DUH Steve St... 539 visits

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 486 visits

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 718 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... 742 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... 698 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... 684 visits

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Uploaded on 09/25/2012 - 11:04am by WA7DUH Steve St... 609 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 549 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 586 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 781 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... 712 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 561 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 553 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 464 visits

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Uploaded on 09/25/2012 - 11:03am by WA7DUH Steve St... 558 visits

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After assembling 1 of the active elements on the grass by the tower in about 3 hours, assembly was moved into Steve & Linda's shop where an assembly line could be set up, as there are 6 of these to make. Time was reduced to about 1 hour per unit.

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 631 visits

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There is a lot of electronics and relays that go into this antenna. Pictured is Gary W7TYQ that came up to help from Yreka CA.

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 502 visits

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Control lines from each active element and the coax switching relays come together into junction terminals.

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 513 visits

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 565 visits

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 555 visits

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 719 visits

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A very thick polifin heat shrink tube locks each joint into place.

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Uploaded on 09/25/2012 - 11:02am by WA7DUH Steve St... 539 visits

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Although not called for in the assembly manual, on recommendation from Brian W7BJN, a glue bead is placed at each nesting tube junction to prevent them from sliding back in over time. Constant movement in the wind at the top of a tower can cause them to work in according to Brian. Made sense to this crew.

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 591 visits

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Dave W7DJE helps measure out an element tube. These nesting tubes are pulled out, and the ends are trimmed to length with a hacksaw.

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 474 visits

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OK, how to these hollow fiberglass tubes go together??

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 581 visits

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All the cabling prior to clean up.

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 440 visits

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Coax switching unit. All three active elements may be driven.

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 551 visits

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 658 visits

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 559 visits

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Uploaded on 09/25/2012 - 11:01am by WA7DUH Steve St... 469 visits

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Installing the driven element return fixture.

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 548 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... 695 visits

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Distance between this driven element EHU and the element return fixture is critical. Houston, we have a problem. The driven element is centered on the mast, which means it will loop around the tower. This will cause great difficulty with the tower guy lines.

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 436 visits

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Both the EHU and Element Return fixture must be leveled, then torqued to specifications.

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 470 visits

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 519 visits

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The reflector EHU and element return fixture mounted on boom.

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Uploaded on 09/25/2012 - 11:00am by WA7DUH Steve St... 508 visits