6 meter balun - HomeBrew Forum at eHam.net

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6 meter balun	Reply
by N5JZD on January 27, 2009	Mail this to a friend!
I want to make a 1 to 1 balun for my homebrew 6 meter quad. Can someone tell me the length of the coax and how many turns to make etc to make the balun. I will really appreciate any help you can give me.

RE: 6 meter balun	Reply
by WW5AA on January 27, 2009	Mail this to a friend!
I use my coax baluns for 160-6 meters. I use RG6, ten- six inch turns (about 5' of coax). 73 de Lindy

RE: 6 meter balun	Reply
by WW5AA on January 27, 2009	Mail this to a friend!
The feed line length shouldn't make any difference unless something is wrong with the antenna. 73 de Lindy

RE: 6 meter balun	Reply
by WB2WIK on January 28, 2009	Mail this to a friend!
>RE: 6 meter balun Reply by WW5AA on January 27, 2009 Mail this to a friend! I use my coax baluns for 160-6 meters. I use RG6, ten- six inch turns (about 5' of coax).< ::Ten 6" turns (if you mean 6" diameter) isn't 5' of coax, it's 15.7 feet of coax. "Loops" that large won't do anything on six meters, they're too big. An effective "coax choke" balun for six meters is 6 turns of coax wound on a 2" diameter. This is only about 3 feet of coax. Don't make the diameter too large on six meters, or the cable starts looking like "just more coax" and not a choke. WB2WIK/6

RE: 6 meter balun	Reply
by WW5AA on February 3, 2009	Mail this to a friend!
I guess we went to different schools together Steve. 10x6"=60" 60" divided by 12"=5' 73 de Lindy

RE: 6 meter balun	Reply
by KB1DRK on February 3, 2009	Mail this to a friend!
If you're talking 6" diameter, the math is pi * 6" x 10 turns = 188.4" = 15.7' If you're talking 6" of wire per turn, that's around a 2" diameter.

RE: 6 meter balun	Reply
by KU3X on April 1, 2009	Mail this to a friend!
Why are you even bothing to go though all the trouble of cutting all kinds of coax to the proper lenght and trying to make it work? The easiest and simple way to do this is to just put two sets of #43 ferrite split cores on the coax next to the feed of the antenna. The Amidon part number, per set, is: 2X-43_151. You can usuall pick these things up at a good hamfest for about $2.50 to $3.50 a set. Barry, KU3X

RE: 6 meter balun	Reply
by WA7NCL on April 2, 2009	Mail this to a friend!
You should consider using a half wave chunk of coax to make a balun for six using coax. There is a description of how to do it in the ARRL handbook. The use of ferrite beads or a ferrite toroid is also a good idea and probably the simplest. You can add as many as needed to get the common mode impedance you want. You can look at the mfgrs data and see what the choking impedance is at some frequency close to 6 meters. The least desireable option is the coiled coax choke balun. It would be hard to know just how many turns to use versus the series resonant frequency etc. Also the coiled coax being a solenoidal inductor would be significantly influenced by surrounding structures. It would not be my first choice.

RE: 6 meter balun	Reply
by WA4PTZ on April 2, 2009	Mail this to a friend!
KU3X has the best idea. 73, Tim WA4PTZ

RE: 6 meter balun	Reply
by WB2WIK on April 2, 2009	Mail this to a friend!
>RE: 6 meter balun Reply by KB1DRK on February 3, 2009 Mail this to a friend! If you're talking 6" diameter, the math is pi * 6" x 10 turns = 188.4" = 15.7' If you're talking 6" of wire per turn, that's around a 2" diameter.< ::Bingo. That's why I said 15.7' The clamp-on ferrites might work, but I've not had great luck with them on feedlines as they're usually too loose to prevent water intrusion and other stuff when used outdoors. I just use snug-fitting ferrite toroid cores, stack a dozen of them or so tightly together over the cable near the feedpoint, shrink some tubing over them, and tie the bundle in place with a couple of tie-wraps (UV resistant, black ones!) and call it a day. The cores are cheaper than the snap-together ones, anyway... WB2WIK/6

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