Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
Chris:
This looks like a new idea to me. I will wind a couple/few and play with them. If they perform as you state--this is revolutionary. Now be prepared for attacks from the ego freaks and religious radio zealots... ESPECIALLY if you are correct... grin John "Chris Trask" wrote in message ink.net... In recent days on the QRP-L mailing list, the following remarks were made by Tom Rauch, W8JI regarding the design of 4:1 current baluns: "...it is impossible to build a 4:1 ratio current balun that uses two 1:1 baluns on a single core." and: "It's well established any balun made up of series / parallel transmission lines requires different voltages from the start to finish of each transmission line. " I have devised and modeled a 4:1 current balun using two 1:1 baluns on a single core, and have tested a fully functional prototype. The design can be built without any core, if so desired. The full disclosure of this design with all theory, references, and test results can be obtained from my web page at: http://www.home.earthlink.net/~chris...k4to1Balun.pdf The design proves beyond all reasonable doubt that the above statements to the contrary are, to put it mildly, gravely in error. Chris ,----------------------. High Performance Mixers and / What's all this \ Amplifiers for RF Communications / extinct stuff, anyhow? / \ _______,--------------' Chris Trask / N7ZWY _ |/ Principal Engineer oo\ Sonoran Radio Research (__)\ _ P.O. Box 25240 \ \ .' `. Tempe, Arizona 85285-5240 \ \ / \ \ '" \ IEEE Senior Member #40274515 . ( ) \ '-| )__| :. \ Email: | | | | \ '. http://www.home.earthlink.net/~christrask c__; c__; '-..'.__ Graphics by Loek Frederiks |
#2
|
|||
|
|||
"John Smith" wrote:
This looks like a new idea to me. I will wind a couple/few and play with them. If they perform as you state--this is revolutionary. Now be prepared for attacks from the ego freaks and religious radio zealots... ESPECIALLY if you are correct... grin John John, Thank you. I went looking through the extensive literature that I have here before sitting down and coming up with this. After it was all modeled, prototyped, and tested I could only wondered why I had not seen something like this earlier. I've modeled this as ideal transformers, real-world transformers (with losses and parasitics), ideal transmission lines, and lossy transmission lines and it comes out the same, with minor variations of course. I prototyped it with short coaxial cables as I did in order to minimse the parasitics and show that the models and the concept were basically valid. I'm already catching some flak, but so far it's mostly pointless dribble and obfuscation. You wouldn't believe some of the nonsense that I've been seeing. One person claims that in order to use ferrite properly with coaxial cables to make them appear shorter the ferrite has to be inside the cable between the outer braid and the centre conductor. He was immediately slam-dunked into the kill filter. Chris ,----------------------. High Performance Mixers and / What's all this \ Amplifiers for RF Communications / extinct stuff, anyhow? / \ _______,--------------' Chris Trask / N7ZWY _ |/ Principal Engineer oo\ Sonoran Radio Research (__)\ _ P.O. Box 25240 \ \ .' `. Tempe, Arizona 85285-5240 \ \ / \ \ '" \ IEEE Senior Member #40274515 . ( ) \ '-| )__| :. \ Email: | | | | \ '. http://www.home.earthlink.net/~christrask c__; c__; '-..'.__ Graphics by Loek Frederiks "Chris Trask" wrote in message ink.net... In recent days on the QRP-L mailing list, the following remarks were made by Tom Rauch, W8JI regarding the design of 4:1 current baluns: "...it is impossible to build a 4:1 ratio current balun that uses two 1:1 baluns on a single core." and: "It's well established any balun made up of series / parallel transmission lines requires different voltages from the start to finish of each transmission line. " I have devised and modeled a 4:1 current balun using two 1:1 baluns on a single core, and have tested a fully functional prototype. The design can be built without any core, if so desired. The full disclosure of this design with all theory, references, and test results can be obtained from my web page at: http://www.home.earthlink.net/~chris...k4to1Balun.pdf The design proves beyond all reasonable doubt that the above statements to the contrary are, to put it mildly, gravely in error. Chris ,----------------------. High Performance Mixers and / What's all this \ Amplifiers for RF Communications / extinct stuff, anyhow? / \ _______,--------------' Chris Trask / N7ZWY _ |/ Principal Engineer oo\ Sonoran Radio Research (__)\ _ P.O. Box 25240 \ \ .' `. Tempe, Arizona 85285-5240 \ \ / \ \ '" \ IEEE Senior Member #40274515 . ( ) \ '-| )__| :. \ Email: | | | | \ '. http://www.home.earthlink.net/~christrask c__; c__; '-..'.__ Graphics by Loek Frederiks |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Long/random-wire balun and grounding Q (longish) | Antenna | |||
FS: sma-to-bnc custom fit rubber covered antenna adapter | Equipment | |||
Current in loading coil, EZNEC - helix | Antenna | |||
Serious radiation questin | Antenna | |||
Smith Chart Quiz | Antenna |