On Mon, 8 Dec 2008 23:31:40 -0500, Marc Tessier - VE3TES wrote:
>Just playing around with an antenna design , I found the plans for an
80M version of such antenna on the net recently, and was wondering if
this one might work for 160M as well, link >>> http://home.cogeco.ca/
~ve3tes/linear%20loaded%20160m%20dipole.JPG
>and would it be possible to make this into a twin band dipole by adding
relays to short out the lengths of ladder line? as shown here as
switches >>> http://home.cogeco.ca/~ve3tes/linear%20loaded%20160m%
20dipole-80switch.JPG
Interesting idea. It all depends on how much space you have. If you can
string about 165 ft horizontally, the 160/80/40 dipole in this piece has
worked really well for me in two very different QThs, and the loaded
80/40 version worked really well both here and in Chicago.
http://audiosystemsgroup.com/LimitedSpaceAntennasPPT.pdf
You can buy the loading coils from "Hypower Antenna Co" -- see small ads
in the back of QST or google to find his website.
Another way to load (shorten) a dipole is to get some of the length from
wires drooping down toward the ground from either or both ends. That
doesn't change the pattern or the efficiency a lot -- the center of the
antenna carries the most current and does the most radiating.
73,
Jim K9YC
Santa Cruz, CA
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