tlongo
Joined: 17 Jul 2007
Posts: 14
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 Posted: Tue Jul 15, 2008 10:45 am Post subject: Half wave dipole |
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Hi Scott, this will work with any frequency you want to make a half wave
dipole for. Take the freq in mhz you want to make antenna for and divide it
into 468 and that is the correct length in feet. For instance 123.00 mhz
would be 468 divided by 123 equals 3.8 feet for your half wave. Now take 3.8
divided by 2 and you get 1.9 feet, so take 1.9 feet of wire and solder it to
center conductor of 50 ohm coax and 1.9 feet and solder to the shield of the
coax and you have a half wave dipole. If you want to make your own 1/4 wave
antenna take a 1.9 foot rod of aluminum or stainless and hook center of coax
to it and insulate that from ground when you mount it, then put shield of
coax to ground of airframe and you now have a 1/4 wave antenna that did not
cost an arm and a leg to buy. You can trim to a perfect SWR if you have a
meter but it will work fine if you just cut it to the proper length. Tom
--
Checked by AVG.
5:48 AM
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