Homemade Segmented Dipole - HomeBrew Forum at eHam.net

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eHam.net Forum : HomeBrew : Homemade Segmented Dipole

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Homemade Segmented Dipole	Reply
by KI4HNN on June 7, 2006	Mail this to a friend!
Hi all, I have been looking at makeing a dipole antenna to use on 6meters and 11meters. According to the article that i have been reading it says to subdivide each leg in series to each other insulated by a insulator and then use a jumper to change bands. Since the 11 meter dipole would be longer in lenght rig that up and then hook up the 6 meter dipole right under that, when wanting to use 6 meters just switch the jumper correct? Will this work? Or are there other ways to go about doing this other than makeing a ground plane antenna? Thanks, Joey

RE: Homemade Segmented Dipole	Reply
by WW5AA on June 7, 2006	Mail this to a friend!
I think I see a fan dipole on the horizon! LOL 73, de Lindy, WW5AA

RE: Homemade Segmented Dipole	Reply
by WW5AA on June 7, 2006	Mail this to a friend!
Joey, Due a search here on FAN DIPOLE and your problem will be solved, good luck. 73, de Lindy

RE: Homemade Segmented Dipole	Reply
by WW5AA on June 7, 2006	Mail this to a friend!
That is do a search in "TOWER TALK".

RE: Homemade Segmented Dipole	Reply
by WB6BYU on June 7, 2006	Mail this to a friend!
I suspect the original article meant to make one dipole with insulators in it at the proper length for 6m. There would be extensions beyond the insulators that would make a 11m dipole if you put a jumper across the insulators. So each side would be 1.5m of wire connected to the coax with an insulator on the other end. This is your 6m dipole. There would be an additional 1.25m of wire connected to the other side of this insulator so it will work on 11m instead if you jumpered around the insulators with a cliplead. Depending on the mechanical (and practical) circumstances, it may be more convenient to build separate dipoles for both bands with a common feedpoint, which wouldn't require any switching between them.

RE: Homemade Segmented Dipole	Reply
by KI4HNN on June 7, 2006	Mail this to a friend!
First of all I would like to thank everyone for there suggestions and tips. I like the idea of the fan dipole, makes more since than the other type of dipole and makes switching bands so much more easier. I do have a question. What would the lenghts have to be for the 6meter and 11 meter bands. I know that the 11 meter band is 8.5feet on each side. Would 52.8 or 60ft sound right for each side for the 6 meter band? Also this type of antenna does not need a antenna tuner does it? I don't have just a swr meter at the moment. I assume by using 50ohm coax no balum is needed? I also would like to build a dipole to listen to 160-15 meters. Can you put up just a randon wire antenna at a specific lenth to listen in on the different bands? Thanks, Joey

RE: Homemade Segmented Dipole	Reply
by WB6BYU on June 8, 2006	Mail this to a friend!
The common formula for a dipole is 468/f, where f is the frequency in MHz. This gives the result in feet. So you will find that a 6m dipole is closer to 9 feet long rather than 60. Although such an antenna shouldn't require a tuner, it does need to be "tuned", that is, it will require some adjustment for minimum SWR to take into account construction tolerances and the local environment. Usually this means adjusting the length of the wires for minimum SWR. This is a good excuse to join the local radio club and/or meet some local hams and have someone bring over a meter to help you. You can put up a long wire for listening to other bands, or just unscrew the shell of the coax connector and pull it out from the socket a bit - with just the center conductor touching the antenna and feedline will act like a long wire antenna.

RE: Homemade Segmented Dipole	Reply
by W3LK on June 9, 2006	Mail this to a friend!
Joey: Curiosity overwhelmes me ... Why would you make a 6m/11m combo dipole? 73, Lon - W3LK Baltimore, Maryland

RE: Homemade Segmented Dipole	Reply
by KI4HNN on June 9, 2006	Mail this to a friend!
Lon, I have a 6 meter rig and I wanted to do some experimenting with the rig and the band. As for 11 meters (CB) I have a few friends that use it from time to time, I also like to listen in and to a little dxing from time to time with others. I just figured If I got some experience putting up hf antennas and I could use these bands to do my experimenting before I upgraded my license later on. Joey

RE: Homemade Segmented Dipole	Reply
by WB6BYU on June 9, 2006	Mail this to a friend!
For relatively local work, you'll probably have the best results with the 11m dipole vertical (or at least sloping so it is as vertical as possible.) The 6m dipole would do best vertical if you are operating FM, but it should be horizontal for CW/SSB weak signal work. (This is simply the convention that others use, and you'll generally get the best results if you use the same polarizaton as the stations you are trying to work.) This might be a good argument for using two wires instead of moving jumpers to change bands. Have fun experimenting!

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