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#1
February 15th 04, 07:13 PM
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Baluns
Hi.
Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? 1:1, 1:4, 1:9 ??? Not sure what all this means. Is there a site where i can see different homebrew projects for each of these ? All help welcome Regards Jeff |
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#2
February 15th 04, 07:46 PM
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JEFF UK wrote:
Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? A long wire is usually unbalanced. A receiver is usually unbalanced. No need for a "BALanced-UNbalanced" function. Assuming your "long wire" is a non-resonant antenna, forget the balun for SWL. But an antenna tuner might solve the problem you are trying to solve, i.e. a more efficient transfer of energy from the antenna to the receiver. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#4
February 16th 04, 10:37 AM
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http://dxantennas.com
"Richard" wrote in message ... "JEFF UK" wrote in message ... Hi. Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? 1:1, 1:4, 1:9 ??? Not sure what all this means. Is there a site where i can see different homebrew projects for each of these ? All help welcome Regards Jeff Sorry, I just copied all my links: http://anarc.org/naswa/badx/antennas/ http://users.netonecom.net/~swordman/Radio/unun.htm http://www.bytemark.com/index.htm http://www.google.com/ http://members.aol.com/DXerCapeCod/z_transformers.pdf http://www.palacenet.net/home/mules/antenna.html http://www.anarc.org/naswa/badx/ante...e_antenna.html http://www.hard-core-dx.com/nordicdx...d/magbal3.html http://www.hard-core-dx.com/nordicdx.../magbalun.html http://www.albany.net/~bg/topband/BeverageXfmrs.htm http://www.antennex.com/palomar/page_6.htm http://www.universal-radio.com/catalog/sw_ant/1465.html http://www.anarc.org/naswa/issues/0398/tech0398.html http://users.erols.com/r.smith/feed1.html http://www.wellbrook.uk.com/UMB.html http://www.wellbrook.uk.com/longwire.html http://www.cwsbytemark.com/prices/ununs.php http://www.alphalink.com.au/~parkerp/nojun98.htm http://www.iserv.net/~n8kdv/xfmr.htm --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.588 / Virus Database: 372 - Release Date: 13/02/2004 |
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#5
February 16th 04, 08:42 PM
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Cheers guys
Jeff "Whoopydoo" vk3kcg@guess the rest.con wrote in message u... http://dxantennas.com "Richard" wrote in message ... "JEFF UK" wrote in message ... Hi. Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? 1:1, 1:4, 1:9 ??? Not sure what all this means. Is there a site where i can see different homebrew projects for each of these ? All help welcome Regards Jeff Sorry, I just copied all my links: http://anarc.org/naswa/badx/antennas/ http://users.netonecom.net/~swordman/Radio/unun.htm http://www.bytemark.com/index.htm http://www.google.com/ http://members.aol.com/DXerCapeCod/z_transformers.pdf http://www.palacenet.net/home/mules/antenna.html http://www.anarc.org/naswa/badx/ante...e_antenna.html http://www.hard-core-dx.com/nordicdx...d/magbal3.html http://www.hard-core-dx.com/nordicdx.../magbalun.html http://www.albany.net/~bg/topband/BeverageXfmrs.htm http://www.antennex.com/palomar/page_6.htm http://www.universal-radio.com/catalog/sw_ant/1465.html http://www.anarc.org/naswa/issues/0398/tech0398.html http://users.erols.com/r.smith/feed1.html http://www.wellbrook.uk.com/UMB.html http://www.wellbrook.uk.com/longwire.html http://www.cwsbytemark.com/prices/ununs.php http://www.alphalink.com.au/~parkerp/nojun98.htm http://www.iserv.net/~n8kdv/xfmr.htm --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.588 / Virus Database: 372 - Release Date: 13/02/2004 |
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#6
February 16th 04, 10:02 PM
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Hi Jeff, the short, simple answer , for a long wire antenna, is: you would
use an antenna tunner, NOT A BALUN ! A BALUN converts from an unbalanced source (or load) -- read that : COAX, to a BALANCED load (or source) Like TWIN-LEAD, or LADDER LINE! The 1:1, 1:4, and 1:9 is the impedence ratio (like a transformer) 1:1 means that , say 75 ohm in will still be 75 ohm on the output side, 1:4 means that the same 75 ohms in will become matched at 300 ohms on the output side, 1:9 would give you 675 ohms on the output side! BUT, a longwire antenna is a different beast, altogether!! its impedence can change drastically, depending upon length, frequency applied, height above ground, ect. A antenna tuner can match our 75, or 50 ohm from a transciever, to very complex impediences , even reactive impedences Like 67 ohm capacitive and 22 ohm resistive, or even inductive reactances ! and, for recieve, probably makes little difference, unless you have lots of feedline loss! It would be the same for transmitting, except, that many rigs (especially solid state) dont like impedences that the were designed for, causinf a swr monitoring device to shut down the power amp, or worse-- causing excessive voltages to appear across the pa, causing self destruction! To use a tuner, simply adjust it, until you have a 1:1 match on an swr bridge, placed between the tuner, and your transmtter! And, btw, maximum power transfer occurs when the input impedence and the output impedence are the same! that is what the tuner does-- makes the input impedence match the output impedence-- have fun! Jim NN7K "Whoopydoo" vk3kcg@guess the rest.con wrote in message u... http://dxantennas.com "Richard" wrote in message ... "JEFF UK" wrote in message ... Hi. Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? 1:1, 1:4, 1:9 ??? Not sure what all this means. Is there a site where i can see different homebrew projects for each of these ? All help welcome Regards Jeff |
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#7
February 18th 04, 10:01 PM
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Some good info on impedance matching to an SWL longwire can be found he
http://www.anarc.org/naswa/badx/ante..._longwire.html Al KA5JGV "JEFF UK" wrote in message ... Hi. Would some please explain to me the different types of SWL Baluns and what type should be used for which antenna.? I use a long wire at the moment. What is best for this.? 1:1, 1:4, 1:9 ??? Not sure what all this means. Is there a site where i can see different homebrew projects for each of these ? All help welcome Regards Jeff |
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