[Hallicrafters] Re: Dipole antenna

[peter markavage]

You should replace center pieces cut with 1/4 inch white rope. Since RF
travels along the surface of a conductor, i.e. skin effect, and both
wires are in the same plane, although separated by the rope, the
shortened dipole should perform quite well. I believe he specified "white
rope" in a "feedback' section in a later article. Black or grey rope was
not recommended. One of those modern marvels you don't hear about too
often. Glad you brought it up Doug.


On Thu, 24 Feb 2005 14:15:30 EST Troglodite at aol.com writes:
> I wonder if anyone remembers the article by Larson E. Rapp on 
> shortened  
> dipoles? Basically, his theory was this: We have all seen the 
> classic voltage  and 
> current plot of a dipole. The current peaks at the middle, and  the 
> voltage 
> peaks at the ends. (Or is it the other way around? ) Anyway,  Larson 
> then goes 
> on to show what happens to the V/I curve when you cut the ends  off 
> the 
> antenna. He then states that, "The problem is NOT that the antenna 
> was  made 
> shorter, but the WRONG PIECES were removed." This is backed up by an 
> E/I  plot. His 
> proposal is that the antenna should be shortened by cutting the 
> pieces  out of 
> the MIDDLE. And sure enough, the E/I plot looks much better!
>  
> We should all immediately begin saving on antenna wire! 
>  
> Doug Moore
>  
>  
> > Anyway, if you have two monopoles (which some claim to be 
> fictitious  
> > devices) and join them just right, you get a dipole.