Posted by
Jim Bruce on
Aug 26, 2020; 1:24am
URL: http://elecraft.85.s1.nabble.com/Inverted-L-for-160-meters-tp7664325p7664338.html
For mine I have 1/4 wave wire for 160, goes up 35-40 ft and over to pole
in corner of the yard with the remainder of the wire. I use mostly
random length ground radials on top of the ground, some 1/4 wave, some
sorter, some longer, mostly shorter,(someway shorter thanks to the lawn
mower height), 12 so far and I add more when I get extra wire. 100 watts
I work from here in Maryland to US west coast, Caribbean and into Europe
and north Africa. I am happy for now but want to get more vertical
height some day. Radials are sections of free 2 each 1000 foot rolls of
4 pair cat 5 cable.
Jim/W3FA
On 8/25/2020 19:23, 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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