[Elecraft] Magnetic Loop Antenna Question

[Augie "Gus" Hansen]

The length of hardline provides both an inductor (the shield) and a 
series capacitor (the center conductor to shield). It is an interesting 
experimental loop antenna, but not particularly versatilefor general use.

There is a picture of my two-turn mag loop for 40-80m on my QRZ .com 
page. I wrote an article for antenneX several years ago describing this 
antenna, but it is behind the "pay wall" so I can't post it anywhere else.

The main loop is about 4.5 feet in diameter formed by using the shield 
of 7/8-inch Heliax. The loop is remotely tuned over the coax by a DC 
motor-driven vacuum variable capacitor. The antenna can handle between 
500 watts and 1KW depending on frequency if the VVC is stout enough 
(15kV at 60 amps). The driver loop is about 1/5 the diameter of the main 
loop diameter.

73,
Gus Hansen
KB0YH


On 11/13/2016 11:57 AM, w7aqk wrote:
> Stan,
>
> Well, my first question was "how about the capacitor?".  I looked at 
> the article, and it says no capacitor needed, but that it is mono band 
> only.  I would have to guess that it is "mono-frequency" as well, or 
> just about!!!
>
> Dave W7AQK