In a message dated 96-09-17 20:39:21 EDT, you write:
>
>Gentlemen,
>Please allow me to comment on another "universal truth" that ain't quite so.
> the
>ideal transformer for a Beverage antenna is not an autotransformer as
>recently described. Due to significant surface wave ground loops induced in
>feed lines for Beverages, especially if they are long, are a big cause of
>spurious signal reception.
That is VERY good advice, and the absolute truth. That's why I use both
isolated primarys *and* choke sleeve baluns and ground rods along the
feedline. Feedline conducted garbage is a problem with any receiving antenna!
Using a "shielded drop wire" to prevent signal pick up on the vertical ends
also will not help unless you have a source of coupling within a few cable
diameters of the drop.
73 Tom
--
FAQ on WWW: http://www.contesting.com/topband.html
Submissions: topband@contesting.com
Administrative requests: topband-REQUEST@contesting.com
Sponsored by Akorn Access, Inc & KM9P
|