[Antennas] Antenna noise?

[Ron Youvan]

   Hi  Ray LaRue wrote:

> Haven't seen much over this reflector lately, so I though I would "stir 
> the pot".

> It seems to be accepted that a loop antenna (certainly a small one 
> relative to a wavelength), is less "noisy" than say a dipole or the like.
> 
> Does anyo have any insight or references that have studied at what 
> size (meaning circumference around the loop), does the electrostatic 
> part of the EMF begin to noticeable decrease and the magnetic part 
> increase?

> It's a serious question aimed at what size from a 1 wavelenght perimeter 
> downward, does the magnetic portion begin the dominate, to the effect of 
> minimizing noise, without reducing received signals.

   I don't think very many antennas generate noise* (or RF) I think
the ability to pickup noise varies between designs and implementations.

   I think loops in general have no very high impedance area as Verticals
and dipoles have, I think such high impedance areas capacitivly pick up
existing nearby noise.

  * save wind, rain and snow noise
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.