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#1
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4:1 balun question
Anyone here have a good web reference on making a 4:1 balun? I'm looking
for the dual core design, not the single core design. Lots of those to google. Do the single core designs really not work? I had a single core homebrew that seemed to work, but I'm a tad confused after hearing that they don't. - 73 de Mike KB3EIA - |
#2
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4:1 balun question
On Tue, 02 May 2006 22:58:00 -0400, Mike Coslo
wrote: Anyone here have a good web reference on making a 4:1 balun? I'm looking for the dual core design, not the single core design. Lots of those to google. Do the single core designs really not work? I had a single core homebrew that seemed to work, but I'm a tad confused after hearing that they don't. The Sept/Oct 2005 issue of QEX has a 4:1 balun design that may interest you. It can be found on the ARRL's members only web site. http://www.arrl.org/qex/2005/qx9roos.pdf 73, Danny, K6MHE In my many years I have come to a conclusion that one useless man is a shame, two is a law firm, and three or more is a congress. - John Adams email: k6mheatarrldotnet http://www.k6mhe.com/ |
#3
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4:1 balun question
Dan Richardson wrote:
The Sept/Oct 2005 issue of QEX has a 4:1 balun design that may interest you. It can be found on the ARRL's members only web site. Would a 4:1 voltage balun fed through a husky 1:1 choke (W2DU BALUN) accomplish the same thing? -- 73, Cecil http://www.qsl.net/w5dxp |
#4
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4:1 balun question
Dan Richardson wrote:
On Tue, 02 May 2006 22:58:00 -0400, Mike Coslo wrote: Anyone here have a good web reference on making a 4:1 balun? I'm looking for the dual core design, not the single core design. Lots of those to google. Do the single core designs really not work? I had a single core homebrew that seemed to work, but I'm a tad confused after hearing that they don't. The Sept/Oct 2005 issue of QEX has a 4:1 balun design that may interest you. It can be found on the ARRL's members only web site. http://www.arrl.org/qex/2005/qx9roos.pdf Thanks, Dan, I'm reading it now... - 73 de Mike KB3EIA - |
#5
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4:1 balun question
Mike Coslo wrote:
Do the single core designs really not work? I had a single core homebrew that seemed to work, but I'm a tad confused after hearing that they don't. The single core designs are usually voltage baluns and what we hams want are balanced currents. I don't see why you couldn't just add a husky 1:1 W2DU style choke on the 50 ohm side of your 4:1 voltage balun to inhibit common mode current. The extra toroid in the afore mentioned QEX article is a 1:1 choke attached to a 4:1 voltage balun. -- 73, Cecil http://www.qsl.net/w5dxp |
#6
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4:1 balun question
Cecil Moore wrote:
Mike Coslo wrote: Do the single core designs really not work? I had a single core homebrew that seemed to work, but I'm a tad confused after hearing that they don't. The single core designs are usually voltage baluns and what we hams want are balanced currents. I don't see why you couldn't just add a husky 1:1 W2DU style choke on the 50 ohm side of your 4:1 voltage balun to inhibit common mode current. The extra toroid in the afore mentioned QEX article is a 1:1 choke attached to a 4:1 voltage balun. I think you are right, Cecil. I'm digesting the pdf now. Probably take a few reads tho' it's been a long, long day.... - 73 de Mike KB3EIA - |
#7
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4:1 balun question
On Wed, 03 May 2006 13:22:45 GMT, Cecil Moore
wrote: The single core designs are usually voltage baluns and what we hams want are balanced currents. I don't see why you couldn't just add a husky 1:1 W2DU style choke on the 50 ohm side of your 4:1 voltage balun to inhibit common mode current. The extra toroid in the afore mentioned QEX article is a 1:1 choke attached to a 4:1 voltage balun. Did you read the article Cecil? He place the current balun/choke on the opposite side. Looked like an interesting approach. Danny In my many years I have come to a conclusion that one useless man is a shame, two is a law firm, and three or more is a congress. - John Adams email: k6mheatarrldotnet http://www.k6mhe.com/ |
#8
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4:1 balun question
Dan Richardson wrote:
Did you read the article Cecil? He place the current balun/choke on the opposite side. Looked like an interesting approach. Yes, I'm wondering if things would change if the positions were reversed? How does that choke perform when it sees 2000 + j1000 ohms? -- 73, Cecil http://www.qsl.net/w5dxp |
#9
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4:1 balun question
When it sees 2000 + j1000 ohms there's hardly any current to choke
anyway. |
#10
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4:1 balun question
"Reg Edwards" wrote: When it sees 2000 + j1000 ohms there's hardly any current to choke anyway. Yes, but how much current is there 3/8WL back from that point? -- 73, Cecil, W5DXP |
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