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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+Toroidal\s+common\s+mode\s+choke\s*$/: 12 ]

Total 12 documents matching your query.

1. Topband: Toroidal common mode choke (score: 1)
Author: "Bill Conwell \(home\)" <bill@conwellpdx.com>
Date: Sat, 17 Nov 2012 09:12:30 -0800
I've got an FT-240-43 core on which I'd like to wind RG58 to make a choke for the feedpoint of my inverted-L. I've seen articles that studied the optimum number of turns for air-core chokes, but don'
/archives//html/Topband/2012-11/msg00273.html (7,153 bytes)

2. Re: Topband: Toroidal common mode choke (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 17 Nov 2012 10:12:50 -0800
See http://audiosystemsgroup.com/RFI-Ham.pdf which includes both measured data for many choke configurations and core materials, and specific recommendations for winding transmitting chokes for the h
/archives//html/Topband/2012-11/msg00274.html (7,885 bytes)

3. Re: Topband: Toroidal common mode choke (score: 1)
Author: DAVID CUTHBERT <telegrapher9@gmail.com>
Date: Sat, 17 Nov 2012 12:25:28 -0700
Bill, the G3TXQ website has the balun info you seek. _______________________________________________ Topband reflector - topband@contesting.com
/archives//html/Topband/2012-11/msg00275.html (8,177 bytes)

4. Re: Topband: Toroidal common mode choke (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 17 Nov 2012 11:53:50 -0800
Yes -- for RG8X, it's in the same pdf. The difference is stray capacitance, and RG58/RG59/RG8X behave similarly, based on conductor diameter. There CAN be some differences based on dielectric propert
/archives//html/Topband/2012-11/msg00277.html (8,312 bytes)

5. Re: Topband: Toroidal common mode choke (score: 1)
Author: "ZR" <zr@jeremy.mv.com>
Date: Sat, 17 Nov 2012 14:11:44 -0500
On 11/17/2012 9:12 AM, Bill Conwell (home) wrote: I've seen articles that studied the optimum number of turns for air-core chokes, but don't recall seeing any for toroidal chokes. Can anyone offer a
/archives//html/Topband/2012-11/msg00292.html (9,193 bytes)

6. Re: Topband: Toroidal common mode choke (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 18 Nov 2012 18:58:12 -0500
Also the difference between Mix 31 and 43 is not great and was used for decades successfully before 31 was introduced. For a non-critical application like this almost anything would work with enough
/archives//html/Topband/2012-11/msg00298.html (8,690 bytes)

7. Re: Topband: Toroidal common mode choke (score: 1)
Author: "ZR" <zr@jeremy.mv.com>
Date: Sun, 18 Nov 2012 19:38:01 -0500
Also the difference between Mix 31 and 43 is not great and was used for decades successfully before 31 was introduced. For a non-critical application like this almost anything would work with enough
/archives//html/Topband/2012-11/msg00311.html (9,699 bytes)

8. Re: Topband: Toroidal common mode choke (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 20 Nov 2012 08:42:26 -0500
On paper I agree but what about real world? Topbanders seemed to do quite well with the old 43 mix and the resultant lower impedance. How much is good enough? That's a good point. It seems we tend to
/archives//html/Topband/2012-11/msg00318.html (10,855 bytes)

9. Re: Topband: Toroidal common mode choke (score: 1)
Author: <donovanf@starpower.net>
Date: Tue, 20 Nov 2012 10:42:14 -0500 (EST)
In the real world, receiving (or transmitting) problems are often caused by faults rather than by inadequate design. The most common problems are connectors and deteriorated coaxial cable caused by p
/archives//html/Topband/2012-11/msg00322.html (11,770 bytes)

10. Re: Topband: Toroidal common mode choke (score: 1)
Author: Guy Olinger K2AV <olinger@bellsouth.net>
Date: Tue, 20 Nov 2012 12:48:44 -0500
What I like about some of the #31 stuff is that I can get those large clamp-ons, wind a particular kind of conductor through it, and then put it up on my analyzer and "tune" that nice resistance hump
/archives//html/Topband/2012-11/msg00328.html (12,279 bytes)

11. Re: Topband: Toroidal common mode choke (score: 1)
Author: Brian Machesney <nekvtster@gmail.com>
Date: Tue, 20 Nov 2012 13:11:42 -0500
problems, and less on treating every system the same." That is a great suggestion, Tom. Can you recommend a resource that gives a "cookbook" approach to identifying and resolving problems? Brian K1L
/archives//html/Topband/2012-11/msg00329.html (8,588 bytes)

12. Re: Topband: Toroidal common mode choke (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 20 Nov 2012 15:31:23 -0500
Replace existing #43 stuff that's working? No way. Do any NEW #43 stuff for low bands? No to that also. The proper mix is dependent on many things, not just net impedance. We have to consider core st
/archives//html/Topband/2012-11/msg00335.html (9,513 bytes)

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