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
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