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Current baluns:
If you have a ferrite rod from an old am radio, this guy shows you a cheap 1:1 balun: http://www.arising.com.au/people/Hol...ph/CMBalun.htm If you already have a toroid you wish to use, just wrap it the same, a bifilar winding, with the two starting ends hooked to your coax connector, other two ends to your antenna. You will want the inductive reactance of the winding to be ~4X the impedance of the coax (or antenna) at the lowest frequency of operation. This will be computed using the al factor from the specific toroid core you have... This works for me... and is a simple way to remember/do it... if others have a simplier/better way--I am sure they will comment... Warmest regards, John "Jayson Davis" wrote in message ... I'd like to make a 1:1 balun, similar to what you'd buy from Van Gorden Engineering. Anyone know of online designs/prints/instructions? Thanks |
.... as a matter of fact, they are scanned from "copyright expired"
material... I took the time to bring everyone up to speed on copyright here... and even to know the difference between expired and not... for some strange reason some have difficulty dealing with this... He is correct about it being a voltage balun, which I believe is what you first asked about, at least that is what the balun you referenced looked like to me--I make mistakes and could have been mistaken... however, there is also a post from me in this thead on the current balun you can use... when you read my post on the quick-start on the differences for voltage/current baluns you can decide for yourself--on what you need... baluns are a very simple thing, don't know why so much mystery wants to end up wrapped about 'em... Warmest regards, John "Ian White GM3SEK" wrote in message ... John Smith wrote: Here is a url to a page I put up--shows both a 1:1 and a 4:1 balun--winding diagrams are below each, respectively... Don't bother to look - they are both voltage baluns. (And the drawings have been scanned from someone else's copyright material.) -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
John Smith wrote:
... as a matter of fact, they are scanned from "copyright expired" material... If so, then I apologise. But... He is correct about it being a voltage balun, which I believe is what you first asked about, at least that is what the balun you referenced looked like to me--I make mistakes and could have been mistaken... however, there is also a post from me in this thead on the current balun you can use... when you read my post on the quick-start on the differences for voltage/current baluns you can decide for yourself--on what you need... baluns are a very simple thing, don't know why so much mystery wants to end up wrapped about 'em... Might it possibly be because people persist in copying and re-re-re-publishing old, incorrect information? -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
I'd like to make a 1:1 balun, =========================== Wind about a dozen turns of twin, stranded, 18 AWG, clear-plastic-insulation, speaker cable (or similar) around a 2" diameter ferrite ring. About 3/8" cross-section. Permeability 200 to 500. And there you have it. Speaker cable is better than coax on both mechanical and electrical grounds. ---- Reg, G4FGQ. |
Well, nice of you to worry about me copying, copyrighted work and suffering
a penality, but let me worry about that... and MOST technical docs have fallen to public domain QUICKLY--especially this stuff which was cutting edge technology--when my grandfather was a boy... There is also "fair use", you may want to read up on it... since the drawing I pasted here is less than a page (much less) it OBIVIOUSLY would fall under this--and I would be covered yet again... Most importantly is the necessity to get facts and info into the hands needing it, in a form which they can understand--in a manner which does not chase them off.. something I DON'T see happening here. Warmest regards, John "J. Mc Laughlin" wrote in message ... Dear "John Smith" The probability that you copied works that were not covered by copyright is minuscule. For such a work not to be covered by copyright it would have had to be declared in the public domain by the author or publisher. Here is a link to the Copyright Office that provides some authoritative information about low long copyright protection lasts: http://www.copyright.gov/circs/circ1.html#hlc Having expressed disdain for lawyers, it is unlikely that you are a lawyer, whatever and whoever you are. The Patent Office lists three patent attorneys with the name of John Smith. I doubt that you are one of them. When you copy works that are almost surely copyrighted and provide no attribution, you encourage persons with an interest in the works to track you down. Not wise. Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: "John Smith" wrote in message ... ... as a matter of fact, they are scanned from "copyright expired" material... I took the time to bring everyone up to speed on copyright here... and even to know the difference between expired and not... for some strange reason some have difficulty dealing with this... He is correct about it being a voltage balun, which I believe is what you first asked about, at least that is what the balun you referenced looked like to me--I make mistakes and could have been mistaken... however, there is also a post from me in this thead on the current balun you can use... when you read my post on the quick-start on the differences for voltage/current baluns you can decide for yourself--on what you need... baluns are a very simple thing, don't know why so much mystery wants to end up wrapped about 'em... Warmest regards, John "Ian White GM3SEK" wrote in message ... John Smith wrote: Here is a url to a page I put up--shows both a 1:1 and a 4:1 balun--winding diagrams are below each, respectively... Don't bother to look - they are both voltage baluns. (And the drawings have been scanned from someone else's copyright material.) -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
Ferrite ring? Now where would I ever find one of those--last guy told me to
buy all these dern toroids!!! grin Good morning Reg! Warmest regards, John "Reg Edwards" wrote in message ... I'd like to make a 1:1 balun, =========================== Wind about a dozen turns of twin, stranded, 18 AWG, clear-plastic-insulation, speaker cable (or similar) around a 2" diameter ferrite ring. About 3/8" cross-section. Permeability 200 to 500. And there you have it. Speaker cable is better than coax on both mechanical and electrical grounds. ---- Reg, G4FGQ. |
"Roy Lewallen" wrote in message ... Read http://eznec.com/Amateur/Articles/Baluns.pdf and you'll know what the difference is, and hopefully why a voltage balun isn't the best to use for antenna applications. Roy Lewallen, W7EL I just printed this out. Looks really good. BTW, for cores and balun kits he should go to www.amidoncorp.com . Tam/WB2TT ............................ |
John, the trouble is at my end, caused by my nincompoop of a
dis-service provider. If previous experience is any guide, it will take weeks to sort it out. When it comes to managing Windows, OE and the Internet, I'm a mere novice. ( The most important thing about ferrite rings is their size. You can't get a dozen turns of speaker cable on 5/8" diameter rings. ) ---- Reg. ============================== "John Smith" wrote in message ... Ferrite ring? Now where would I ever find one of those--last guy told me to buy all these dern toroids!!! grin Good morning Reg! Warmest regards, John "Reg Edwards" wrote in message ... I'd like to make a 1:1 balun, =========================== Wind about a dozen turns of twin, stranded, 18 AWG, clear-plastic-insulation, speaker cable (or similar) around a 2" diameter ferrite ring. About 3/8" cross-section. Permeability 200 to 500. And there you have it. Speaker cable is better than coax on both mechanical and electrical grounds. ---- Reg, G4FGQ. |
Dear "John Smith"
Fair-use is one of the most complex parts of the law. I have studied it and applied it for more many years than you have been a poseur. It has certainly caused considerable amusement among the knowledgeable people in this group to read you suggesting that I read up on the subject. Your pretending to practice law would only be amusing if it were not that some reading what you write might believe you. You copy. You claim it is protected under the doctrine of fair-use and yet you provide no attribution nor context that could support fair-use. That is old fashion plagiarizing. You then start to argue that such theft is for the good of the recipient. All that can be said is that you must have had a mother, and she would be ashamed. Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: "John Smith" wrote in message ... Well, nice of you to worry about me copying, copyrighted work and suffering a penality, but let me worry about that... and MOST technical docs have fallen to public domain QUICKLY--especially this stuff which was cutting edge technology--when my grandfather was a boy... There is also "fair use", you may want to read up on it... since the drawing I pasted here is less than a page (much less) it OBIVIOUSLY would fall under this--and I would be covered yet again... Most importantly is the necessity to get facts and info into the hands needing it, in a form which they can understand--in a manner which does not chase them off.. something I DON'T see happening here. Warmest regards, John "J. Mc Laughlin" wrote in message ... Dear "John Smith" The probability that you copied works that were not covered by copyright is minuscule. For such a work not to be covered by copyright it would have had to be declared in the public domain by the author or publisher. Here is a link to the Copyright Office that provides some authoritative information about low long copyright protection lasts: http://www.copyright.gov/circs/circ1.html#hlc Having expressed disdain for lawyers, it is unlikely that you are a lawyer, whatever and whoever you are. The Patent Office lists three patent attorneys with the name of John Smith. I doubt that you are one of them. When you copy works that are almost surely copyrighted and provide no attribution, you encourage persons with an interest in the works to track you down. Not wise. Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: "John Smith" wrote in message ... ... as a matter of fact, they are scanned from "copyright expired" material... I took the time to bring everyone up to speed on copyright here... and even to know the difference between expired and not... for some strange reason some have difficulty dealing with this... He is correct about it being a voltage balun, which I believe is what you first asked about, at least that is what the balun you referenced looked like to me--I make mistakes and could have been mistaken... however, there is also a post from me in this thead on the current balun you can use... when you read my post on the quick-start on the differences for voltage/current baluns you can decide for yourself--on what you need... baluns are a very simple thing, don't know why so much mystery wants to end up wrapped about 'em... Warmest regards, John "Ian White GM3SEK" wrote in message ... John Smith wrote: Here is a url to a page I put up--shows both a 1:1 and a 4:1 balun--winding diagrams are below each, respectively... Don't bother to look - they are both voltage baluns. (And the drawings have been scanned from someone else's copyright material.) -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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