[TowerTalk] 40-30m dipole design

Jim Brown jim at audiosystemsgroup.com
Thu Mar 17 15:40:36 EDT 2016


On Thu,3/17/2016 12:14 PM, jimlux wrote:
> There's no big advantage to linear loading: you might as well use a 
> good low loss inductor at the feed (the "shorty 40" does this).

Are you certain about this, Jim? Both change the current distribution, 
but linear loading changes it least at the center, where current is 
greatest. The inductor places maximum current in the inductor, which 
doesn't radiate. NEC doesn't model that very well, treating the inductor 
as a lumped element, with no change in the current distribution across 
it. NEC probably would model linear loading pretty well if the model 
accurately described the antenna.

73, Jim K9YC





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