- 1. Topband: Coax Choke Balun (score: 1)
- Author: "Bill Gillenwater" <gillie@pa.net>
- Date: Tue, 10 Nov 2009 18:58:28 -0500
- I need some suggestions, or the "go-ahead". I am getting ready to wrap 30 turns of RG213 around a 14" piece of 8" round PVC, for use as a choke on my inverted L. Is there a better way? I currently ha
- /archives//html/Topband/2009-11/msg00294.html (6,764 bytes)
- 2. Re: Topband: Coax Choke Balun (score: 1)
- Author: "Jim Brown" <jim@audiosystemsgroup.com>
- Date: Tue, 10 Nov 2009 20:47:54 -0800
- YES! http://audiosystemsgroup.com/RFI-Ham.pdf See the "Choke Cookbook" about halfway through it, following the text on coax chokes. These chokes are FAR superior to any alternatives I know of. 73, Ji
- /archives//html/Topband/2009-11/msg00299.html (6,725 bytes)
- 3. Re: Topband: Coax Choke Balun (score: 1)
- Author: DAVID CUTHBERT <telegrapher9@gmail.com>
- Date: Wed, 11 Nov 2009 01:38:26 -0700
- Bill, your new choke has an inductance of 110 uH and presents an impedance of +j1300 ohms. Dave WX7G _______________________________________________ 160 meters is a serious band, it should be treated
- /archives//html/Topband/2009-11/msg00301.html (7,590 bytes)
- 4. Re: Topband: Coax Choke Balun (score: 1)
- Author: K4SAV <RadioIR@charter.net>
- Date: Wed, 11 Nov 2009 09:29:51 -0600
- The choke balun will work (depending on how much impedance you really need). There are some advantages to using a ferrite core, but obtaining the core(s) is sometimes a problem. 30 turns of RG213 sho
- /archives//html/Topband/2009-11/msg00304.html (8,472 bytes)
- 5. Re: Topband: Coax Choke Balun (score: 1)
- Author: "Jim Brown" <jim@audiosystemsgroup.com>
- Date: Wed, 11 Nov 2009 08:19:58 -0800
- really There is a MAJOR advantage to using a ferrite core -- it makes the choke RESISTIVE rather than inductive. A feedline shorter than a quarter wave looks capacitive in the common mode circuit. Ad
- /archives//html/Topband/2009-11/msg00307.html (8,480 bytes)
- 6. Re: Topband: Coax Choke Balun (score: 1)
- Author: K4SAV <RadioIR@charter.net>
- Date: Wed, 11 Nov 2009 20:26:05 -0600
- K9YC is correct in pointing out that a coax choke's impedance is due to its reactance and the impedance obtained when using a ferrite is predominately resistive. In some situations this can cause pro
- /archives//html/Topband/2009-11/msg00316.html (9,716 bytes)
- 7. Re: Topband: Coax Choke Balun (score: 1)
- Author: K4SAV <RadioIR@charter.net>
- Date: Wed, 11 Nov 2009 22:07:05 -0600
- K4SAV wrote: I'm just trying to be accurate in describing what happens when you use a coax choke. Well I was TRYING to be accurate, but I missed the description of what happens at the 1/2 wavelength
- /archives//html/Topband/2009-11/msg00317.html (7,821 bytes)
- 8. Re: Topband: Coax Choke Balun (score: 1)
- Author: Roger Parsons <ve3zi@yahoo.com>
- Date: Thu, 12 Nov 2009 09:13:45 -0800 (PST)
- "There is a MAJOR advantage to using a ferrite core -- it makes the choke RESISTIVE rather than inductive." With respect, I don't believe this to be correct. A ferrite/dust iron cored inductor has ex
- /archives//html/Topband/2009-11/msg00324.html (8,128 bytes)
- 9. Re: Topband: Coax Choke Balun (score: 1)
- Author: "Ward Silver" <hwardsil@gmail.com>
- Date: Thu, 12 Nov 2009 14:28:52 -0600
- This depends on the type of ferrite material. Some are designed for very low loss for use in transformer and inductors. Others are designed to have significant loss characteristics for use as RF abs
- /archives//html/Topband/2009-11/msg00331.html (9,030 bytes)
- 10. Re: Topband: Coax Choke Balun (score: 1)
- Author: "K9AY" <k9ay@k9ay.com>
- Date: Fri, 13 Nov 2009 12:07:27 -0600
- _____ We're not quite to the answer yet... Yes, ferrites like 31 material maintain resistive characteristics down to lower frequencies than most ferrites. This is extremely valuable for general purp
- /archives//html/Topband/2009-11/msg00341.html (9,272 bytes)
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