[Elecraft] Need help from an EZNec user on a horizontal loop question

[Ron D'Eau Claire]

My current antenna is an Inverted L 1/2 wavelength long at 80 meters and is
direct fed. That length puts the voltage "loop" (maximum) at the rig, so the
counterpoise requirements are minimal on 80. The L is 40 feet vertical and
80 feed horizontal. That puts the current max near the bend on the "flat
top" for high efficiency. 

I have my own Homebrew L-Net tuner on a shelf above the rig that will handle
the huge voltages experienced at exactly 1/2 wave, but by finagling the
length the impedance can be brought into range of the K3s/KAT500 tuners
without a huge loss in efficiency. However note that the antenna terminates
right in the shack so you need to be concerned about meeting safe RF
exposure limits, especially if running more than 100 watts on the higher
bands.

I use mine with good results on 160 through 20 meters.

73, Ron AC7AC 
 

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Sunday, January 1, 2017 6:44 PM
To: Terry Brown; elecraft at mailman.qth.net
Subject: Re: [Elecraft] Need help from an EZNec user on a horizontal loop
question

Terry,

Have you considered an 80 meter inverted L?

It takes up little real estate for the radiator, but does require putting
down a ground screen at the base of the inverted L.
If you do not wish to bury 32 radials for a ground screen, consider using
resonant elevated radials.  Two elevated radials running in opposing
directions will do the job nicely.

Put the elevated radials above ground by about 10 feet to keep them out of
the range of humans and deer and other things running into them and causing
harm.  If there are horse riders who will be riding through your property,
you may want to increase the height to 15 feet.

73,
Don W3FPR

On 1/1/2017 4:55 PM, Terry Brown wrote:
> I am moving from my current QTH where I have a horizontal loop up 
> about
> 35-40 ft. that is a bit longer than 1 wavelength on 80.  I feed it at 
> one corner with 450 ohm twin lead connected to a 4:1 voltage balun, 
> then coax to my rig.  I can tune all the ham bands either barefoot to 
> my K2 or KX3 and the KXPA100 using their internal tuners.
>
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