The ones I have seen in mobile installations have the (rather large)
coil mounted at the bottom of the vertical element with the vertical
element rising up through the coil. So it's a coaxial arrangement with
the coil outside and the vertical element inside. It sure seemed to work
in that location.
73,
Bill KU8H
On 09/08/2014 09:06 AM, shristov wrote:
rich kennedy via Topband <[email protected]> wrote:
When base-mounting a loading coil (inductor) on a shortened
monopole vertical, is there a preferred method for the physical
placement of the coil? Is it better to orient the coil in
the vertical axis, horizontal axis; very close to the radiator
element or a number of feet away; positioned close to ground
level or elevated (such as on a mounting post ~ 3 feet above ground)?
Assume freq = 1.83 mHz; H = 70 feet aluminum; soil = average to
good; small capacitive hat (spokes, 5’ diameter).
Orientation doesn't matter.
Place it as you would place any other inductor,
i.e. 1-2 coil diameters away from other metallic objects, and from soil.
Protect it from elements, and that's it.
73,
Sinisa YT1NT, VE3EA
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