Re: Inverted L for 160 meters
Posted by
David Gilbert-2 on
Aug 26, 2020; 12:01am
URL: http://elecraft.85.s1.nabble.com/Inverted-L-for-160-meters-tp7664325p7664330.html
Why not model it? It would be very easy to do using the free version of
EZNEC that comes with the ARRL Antenna Book, and you'd be able to try
various combinations (like the fact that you could probably get away
with just one counterpoise wire like I do) to see the effects.
73,
Dave AB7E
On 8/25/2020 4:23 PM, kevinr wrote:
> From what I can find, and what I can calculate, five wires, each ~130
> feet long, could make a nice inverted L for 160 meters. One leg for
> the vertical and horizontal portion of the antenna. Four legs for the
> counterpoise (ground plane). There are many broken wire antennas
> stored in my shed which are fodder for the radials. Do all of the legs
> for the counterpoise need to be 1/4 wavelength or can I substitute
> some shorter lengths? The feedpoint should somewhere above 50 ohms
> impedance. As I add more radials that number will reach 50 ohms
> asymptotically.
>
> I can get the vertical part up to 70 or 80 feet above ground with the
> rest of it horizontal. Most of the radiation should take place from
> the vertical part since it is closer to the feed point. But there
> should be some effect from the direction of the horizontal portion.
> How strongly does the direction of the horizontal portion effect the
> radiation pattern of the antenna system? My property allows me to
> point it from 300 degrees around to 200 degrees so I have plenty of
> options. Between 200 and 300 degrees there is a road used by loggers,
> and the folks maintaining the towers at the top of this mountain.
> They can break any antenna lower than 80 feet above ground. Spar
> poles and cranes clear out any dead limbs across the road.
>
> Inquiring minds...
>
> Kevin. KD5ONS
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