[Antennas] Re: balance

[Dan Richardson]

Ron,

I am sending you a response via email direct as I am including an 
attachment of the article Walter Maxwell wrote on the subject that appeared 
in the March 1983 QST titled Some Aspects fo the Balun Problem which 
explains things very well.

Danny, K6MHE

  At 08:37 PM 3/31/2002 -0500, you wrote:
>< Huh? Then why is that RF chokes (baluns if you like) are used on 
>monopoles? The fact that an antenna is balanced or not does not remove the 
>need for stopping the unwanted current from flowing on the outer shield 
>of  coax.
> >
>   I think the current on the outside of the coax caused by the coax
>acting as the `other half' of the antenna, the counter poise
>wasn't supplied in the design. A balanced antenna normally doesn't
>have much external feed line current, if it is operated in a balanced
>environment.  All it takes is a metal down spout or such to screw it up.
>
>   The correct way to minimize the external feeding current is not
>to chole it off, but to design/build a better antenna.
>   (which we can't always do)
>   Where the balun come in handy is where a previously balanced
>antenna is moved to an un-balanced location, as I did with my
>favorite 40 meter dipole, which is now coming off of the
>corner of my house over the driveway to a tree, the house end
>is about 10 feet over and 8 feet to the side of the metal fire
>escape.  It will not be there forever, so I don't want to re-tune
>it because of this.
>
>       73 (= Best Regards) de: Ron ka4inm@tampabay.rr.com
>    100% LINUX, 100% of the time.   SENT Time and Date are UTC
>        Visit my HAM Web SITE at: http://www.qsl.net/ka4inm
>