Topband: [Bulk] 160M loading coil mounting/orientation

[Grant Saviers]

Have you checked the design with EZNEC?  A little more top hat and you 
won't need a coil.  I had an 80m top loaded 3" dia vertical 40' tall 
which resonated at 3.8MHz.  A tweak of that model to 70' showed the 8 x 
8 ft spokes at the top would resonate at 1.8MHZ, 33 ohms.  A perimeter 
wire seems to help a lot for lowering the resonance according to the 
modeling, but was not in your antenna model.

Grant KZ1W


On 9/8/2014 5:35 AM, rich kennedy via Topband 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).
> thanks, 73, Rich, K3VAT
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