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Old June 3rd 09, 04:29 PM posted to rec.radio.amateur.antenna
Geoffrey S. Mendelson Geoffrey S. Mendelson is offline
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First recorded activity by RadioBanter: Jun 2006
Posts: 487
Default radio antenna designed to pick up a specific station

TefJlives wrote:

There is a particular station in my area, 105.1, that I really like.
Unfortunately, it barely comes in, and sometimes doesn't at all. I
would like to build an antenna which is designed specifically for this
station and which can somehow plug into my normal radio. I know
nothing about this subject. Could someone please point me in the right
direction?


http://bfn.org/~bn589/antenna.html

Plug in the frequency and hit calculate for a 3 element Yagi.

You can make it out of a piece of wood and some stiff wire. Feed it with either
300 ohm twinlead or coax.

If you radio has a 300 ohm connection (two screws) use twinlead, if it has
a single round hole, use coax cable.

you might start with something simpler:

start with a dipole, two 1/4 wave wires one connected to the center of the
coax and the other to the shield (the outside copper braid), or if you
use twinlead, one to each side.

Play with the the location and position (up and down or right and left)
and the angle of the antenna. If you drew an arrow pointing to the station,
it should cross the dipole where the wires connect if it is horizontal.

If that almost works, go to a 1/4 wave vertical (one wire sticking
up with a 4 wires of the same length hanging down. Connect the vertical to
the center wire of the coax or one of the twinlead wires and the four downward
ones to the shield (other wire). The downward ones should be arranged in a
circle around the vertical, e.g.:


downward downward

vertical (up)

downward downward

If that does not work, build a 3 element beam.

If that does not work, see if they have an Internet feed. :-)

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM