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The Amateur Radio Portfolio |
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K4OCD's 31' Tele-Tower | |||
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This is my work in progress, a 31' telescopic aluminum tower that will be used primarily for local UHF / VHF and experimental work. The tower has been in the making for nearly a year to date. It seems there is always something impeding my time and/or ambition on the project. Our long term design focus was to build a hurricane resistant structure that would function in the lowered position up to the maximum wind load of any attached antenna. |
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Pictured here is the wall mount to telescopic tube clamp. Machined in a CNC vertical machining center out of a solid block of aluminum, the complete assembly was designed with hurricane resistance in mind. |
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The part pictured below fastens to the top of the bottom tube section. It manages the raising and lowering of the upper tube via nylon rope and the custom made pulley. The pulley support does double duty by also providing a clamping mechanism to lock the upper tube in place when desired. These parts were also CNC machined from solid aluminum plate. |
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Pictured to the left is the keyway and upper tube spacer. Attached inside the lower tube to the bottom of the upper tube, this spacer allows the nylon raising and lowering cord to attach as well as provides a key are to prevent rotation of the telescopic sections. |
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The telescopic aluminum tubes were cut to length and fitted with the machined fixtures. The lower tube required holes longitudinally to support the fixture key that runs 12 feet inside the tube! The base fixture plates were machined and drilled for the support bolts to the base and four 2 foot long 3/4" bolts were purchased to create the concrete footer base for support. The next task is to dig, pour and set the base as well as mount the wall bracket, raise the tower and install lightning protection; connecting to the ground array already in place. |
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| More to come | ||||
| Project Facts: | 2 Section Telescopic Aluminum Tower | |||
| 15' lowered / 31' raised | ||||
| All aluminum and stainless hardware | ||||
| Pulley fixture for raising & lowering | ||||
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