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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