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1. Topband: Balun Discussions (score: 1): Author: Tom Berry <tberry1@triad.rr.com>; Date: Wed, 31 Dec 2003 12:04:33 -0500; I have found the balun discussions very interesting and informative. I think there has been a lot of good information presented . Thanks Tom AA4VV _______________________________________________ Topb; /archives//html/Topband/2003-12/msg00334.html (6,351 bytes)
2. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Wed, 31 Dec 2003 14:34:59 -0500; The trend stops rather quickly and it is easy to have too many turns on higher bands. After parallel resonance is reached impedance drops. Baluns and other chokes are used in the frequency region wel; /archives//html/Topband/2003-12/msg00335.html (6,563 bytes)
3. Re: Topband: Balun Discussions (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Wed, 31 Dec 2003 23:09:50 +0100; Nobody told that beyond the resonance the choke impedance goes further increasing, of course it doesn't because of inductor self capacitance. Disregarding self capacitance, which is a parasitic effec; /archives//html/Topband/2003-12/msg00340.html (8,427 bytes)
4. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Wed, 31 Dec 2003 19:43:04 -0500; A choke should be regarded a short-circuited transmission line, with input [near] end being at choke treminals, and shorted output [far] end being in the middle of the choke. So the [differential] wa; /archives//html/Topband/2004-01/msg00000.html (7,929 bytes)
5. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Wed, 31 Dec 2003 20:43:16 -0500; The actual mechanism is that of a transmission line, not of a simple capacitance. topband, the inductor reactance is multiplied by four when doubling the number of turns. My own experience from windi; /archives//html/Topband/2004-01/msg00002.html (10,514 bytes)
6. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Thu, 01 Jan 2004 00:10:02 -0500; Hi Mauri, The resonance you are talking about is the series resonance which shows itself as an impedance minimum. Of course, it must be avoided. Below it sits the first parallel resonance, which show; /archives//html/Topband/2004-01/msg00003.html (11,310 bytes)
7. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Thu, 01 Jan 2004 00:24:47 -0500; I missed this one on the first reading. The behaviour you described is that of a "lossless uniform transmission line", uniform meaning constant characteristic impedance accross the line length. Howev; /archives//html/Topband/2004-01/msg00004.html (8,427 bytes)
8. Re: Topband: Balun Discussions (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Thu, 1 Jan 2004 15:02:43 +0100; A plate choke must ?resonate? well above the operating frequency when installed and connected to the amplifier circuits. Choke anomalies of such kind are easily visibile tracking for PI return loss,; /archives//html/Topband/2004-01/msg00011.html (9,248 bytes)
9. Re: Topband: Balun Discussions (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 1 Jan 2004 11:07:06 -0500; Hi Mauri, <A plate choke must "resonate" well above the operating frequency when installed and connected to the amplifier circuits. Choke <anomalies of such kind are easily visibile tracking for PI r; /archives//html/Topband/2004-01/msg00012.html (10,644 bytes)
10. Re: Topband: Balun Discussions (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Thu, 1 Jan 2004 18:32:34 +0100; Hi Tom, the procedure of parking choke resonances out of bands can't be used in a 2-30 MHz continuous coverage unit, and I don't like to have chokes like that in my own amplifiers. When plate choke w; /archives//html/Topband/2004-01/msg00014.html (9,953 bytes)
11. Re: Topband: Balun Discussions (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Thu, 01 Jan 2004 13:27:48 -0500; Mauri, what you just described is exactly a transmission line :-) No, it is just your beleif, just as it was mine. But making a few sound measurements changes that easily. Sure, if "Under the resonan; /archives//html/Topband/2004-01/msg00015.html (8,132 bytes)
12. Topband: Balun Discussions (score: 1): Author: "Marijan Miletic, S56A" <s56a@bit.si>; Date: Thu, 1 Jan 2004 22:29:59 -0000; resonance is quite different from the one at low frequencies, and there is only one possible reason: standing waves on a transmission line. Your debate with I4JMY reminds me of Einstein relativistic; /archives//html/Topband/2004-01/msg00019.html (8,272 bytes)
13. Re: Topband: Balun Discussions (score: 1): Author: "Brad Rehm" <brehm@ptitest.com>; Date: Fri, 2 Jan 2004 09:44:49 -0600; end different order ... cover wide measure Tom et al., I agree. And a very interesting discussion of choke design. I've recently had to deal with the same problem in a different context, and we appl; /archives//html/Topband/2004-01/msg00024.html (11,130 bytes)

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