ELEMENT CONSTRUCTION
1 2 3 4 5 6
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Picture #1 shows the reduction in tube size from 3" to
2". The reducer used was .75" wide with set screws similar to
the reducers used to go from 2" tube to 1" near the loading
coils. Shown with a through bolt and muffler clamp.
Picture #2 shows one element at about 60', slightly below a 10 meter beam.
Picture shows tip supports which were later eliminated.
Picture #3 shows both elements at the base of the tower.
Picture #4 shows one element at about 24' with worker.
Pictures #5 and 6 show how the elements are insulated from the boom with 1"
x 8" x 24" G-10 material with a 2.72" o.d. x 3' piece of
fiberglass tube wrapped with electrical tape between the half elements
ELEMENT LOADING COIL
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The coil forms are 5" ABS stop couplings with cleanout plugs milled, bored, and epoxyed to fit the 3' x 1" G-10 (Garolite) rod that runs through the coil. The coils have a Q of about 400 and inductance of 19uH at 3.8 Mhz. The wire is #8 enameled that sits in a groove machined in the coupling. The coil was coated with epoxy for additional weather protection. The coil is 12 turns over 3.25" so windings are approximately .25" apart.