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.P1020752.JPG
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.
P1020585.JPG
Driving those ground rods down at least 6 inches below grade with a power hammer.
P1020581.JPG
The #4 solid wire and the copper strap is also run to the house electrical ground and into the ham shack entrance.
P1020731.JPG
Director element EHU and element return fixture.
P1020497.JPG
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.
P1020420.JPG
The break wasn't so bad. The mess was created when the sprinkler controller decided to turn the water on, washed out the far bank and filled the hole. Duhhhh.
P1020498.JPG
A better view of the rebar cage.
P1020684.JPG
Fritz loves to ride in the cart as Steve (WA7DUH) goes to the shop to pick up SteppIR antenna parts.
P1020419.JPG
Yikes-- hit the sprinkler pipes. Anyone know a good way to find these sub-surface?
P1020424.JPG
Basic process when digging all the holes-- dirt goes in the cart, Linda (WB7CNV) hauls away.
P1020579.JPG
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.
P1020508.JPG
WB7CNV (Linda) bows properly to the tower gods.
P1020686.JPG
Hygain T2XD rotator mounted on the hazer.
P1020398.JPG
Linda WB7CNV cut about 450 tie wires for the tower base and 3 guy station rebar cages.
P1020754.JPG
A very thick polifin heat shrink tube locks each joint into place.
P1020761.JPG
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.
P1020422.JPG
Trying to fix a cave in. Sandy soil.
P1020583.JPG
#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.
P1020617.JPG
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.
P1020692.JPG
W7TYQ (Gary) tightens everything down after applying antiseize paste.
P1020784.JPG
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.
P1020745.JPG
OK, how to these hollow fiberglass tubes go together??
P1020751.JPG
Dave W7DJE helps measure out an element tube. These nesting tubes are pulled out, and the ends are trimmed to length with a hacksaw.
P1020499.JPG
Adam loves Jessica Kabota.
P1020503.JPG
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.
P1020719.JPG
Many parts to each unit..
P1020391.JPG
The guy rods have 6 x 6 x 1/2 in steel plates to keep them from pulling out of the concrete guy station blocks. Picture shows drilling the 3/4 in holes for the rods. I need a slower turning drill press.