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Total 40 documents matching your query.

21. Re: Topband: Ferrite Cores (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 5 Aug 2014 14:00:48 -0500; It's certainly possible. You can read what he said and see photos at http://forums.qrz.com/showthread.php?240056-Need-source-for-Cushcraft-R5-torroids&p=1882177#post1882177 73, Mike www.w0btu.com ___; /archives//html/Topband/2014-08/msg00041.html (10,067 bytes)
22. Re: Topband: Ferrite Cores (score: 1): Author: Bill Wichers <billw@waveform.net>; Date: Tue, 5 Aug 2014 19:29:23 +0000; It sounds like they werent properly fired from what he said about them crumbling. That, at least, is an easier thing to look for than a messed up mix. If they have poor QC on these things then Id be; /archives//html/Topband/2014-08/msg00042.html (10,953 bytes)
23. Re: Topband: Ferrite Cores (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 5 Aug 2014 15:58:50 -0400; I have seen distributors of core mix cores many times over the years. This includes distributors on the "only approved list". This is why I always verify cores I use. As for Fair Rite being the only; /archives//html/Topband/2014-08/msg00043.html (12,926 bytes)
24. Re: Topband: Ferrite Cores (score: 1): Author: mstangelo@comcast.net; Date: Tue, 5 Aug 2014 20:30:55 +0000 (UTC); Bill, Mouser has the Fairrite core 2631803802 for 6.94 single lot quantities. Mike N2MS FT-240-61 cores. Amidon was $9/ea, Mouser (for the Fair Rite equivalent) was $14/ea. I was only ordering six co; /archives//html/Topband/2014-08/msg00044.html (9,812 bytes)
25. Re: Topband: Ferrite Cores (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 05 Aug 2014 13:31:04 -0700; When a customer orders a replacement part from an equipment manufacturer, there is nearly always a large markup on the part as compared to the cost of buying the part from the manufacturer of the par; /archives//html/Topband/2014-08/msg00045.html (9,807 bytes)
26. Re: Topband: Ferrite Cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 5 Aug 2014 16:51:13 -0400; And the ARRL perpetuates this scam with using Amidon part # in all their publications. I still have hundreds of Fair-Rite ferrites and Micrometals powered iron left over from my Radiokit days and hav; /archives//html/Topband/2014-08/msg00046.html (10,735 bytes)
27. Re: Topband: Ferrite Cores (score: 1): Author: Bill Wichers <billw@waveform.net>; Date: Tue, 5 Aug 2014 21:51:52 +0000; I was buying fair rite #5961003801 though which are $15.79/ea in single-unit quantities from mouser (that is the usual 2.4" od toroid in #61 that is commonly used for baluns). I think one of the othe; /archives//html/Topband/2014-08/msg00047.html (10,721 bytes)
28. Re: Topband: Ferrite Cores (score: 1): Author: "Charlie" <charlie-cunningham@nc.rr.com>; Date: Wed, 6 Aug 2014 05:01:13 -0400; I agree with all those points, Jim! Over the years, professionally, we designed many Fair-Rite, cores into most of our electricity, gas and water meter and electricity load-management products and sh; /archives//html/Topband/2014-08/msg00049.html (11,166 bytes)
29. Re: Topband: Ferrite Cores (score: 1): Author: "Ron Stordahl, AE5E via Topband" <topband@contesting.com>; Date: Wed, 6 Aug 2014 08:15:47 -0700; In this discussion two different ferrite mixes are mentioned: #31 and #61. Is this the case? Ron, AE5E I agree with all those points, Jim! Over the years, professionally, we designed many Fair-Rite; /archives//html/Topband/2014-08/msg00052.html (12,061 bytes)
30. Re: Topband: Ferrite Cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 6 Aug 2014 11:31:33 -0400; 31 and 43 mix are the popular ones in the 2-30 MHz range for common mode suppression; 31 wins at 160 and 80, but 43 is better in the 7-30 range. Before 31 came along I used 43 even at 160 and observe; /archives//html/Topband/2014-08/msg00053.html (12,856 bytes)
31. Re: Topband: Ferrite Cores (score: 1): Author: Tim Shoppa <tshoppa@gmail.com>; Date: Wed, 6 Aug 2014 12:45:22 -0400; HF and for EMI suppression. done shows typical transformers to be good 5kHz-50MHz: http://www.cliftonlaboratories.com/imd_in_broadband_transformers.htm I have been using #73 binocular cores for all; /archives//html/Topband/2014-08/msg00054.html (13,154 bytes)
32. Re: Topband: Ferrite Cores (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 06 Aug 2014 10:10:56 -0700; I would amend that only to say that #31 and #43 are roughly equivalent in the 5-15 MHz, range, #43 is slightly better above 15 MHz. #43 is a bit less expensive than #31, but the cost difference disap; /archives//html/Topband/2014-08/msg00055.html (10,698 bytes)
33. Re: Topband: Ferrite Cores (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 6 Aug 2014 15:09:11 -0400; In this discussion two different ferrite mixes are mentioned: #31 and #61. From the descriptions of these on the Fair-Rite web page, it appears that 31 would be more suitable for lower frequency appl; /archives//html/Topband/2014-08/msg00056.html (10,480 bytes)
34. Re: Topband: Ferrite Cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 6 Aug 2014 15:47:40 -0400; You should start selling them on here along with those balun cores. Carl KM1H I would amend that only to say that #31 and #43 are roughly equivalent in the 5-15 MHz, range, #43 is slightly better abo; /archives//html/Topband/2014-08/msg00057.html (11,469 bytes)
35. Re: Topband: Ferrite Cores (score: 1): Author: "Charlie" <charlie-cunningham@nc.rr.com>; Date: Wed, 6 Aug 2014 17:21:30 -0400; Well, I don't think there is a "one-size" or "one--mix" "fits all" preferred solution. I've wanted to try some 31 mix cores for common-mode isolation at 80 and 160. On the other hand, some of the Fai; /archives//html/Topband/2014-08/msg00058.html (12,663 bytes)
36. Re: Topband: Ferrite Cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 6 Aug 2014 19:48:28 -0400; I would amend that only to say that #31 and #43 are roughly equivalent in the 5-15 MHz, range, #43 is slightly better above 15 MHz. #43 is a bit less expensive than #31, but the cost difference disap; /archives//html/Topband/2014-08/msg00060.html (11,699 bytes)
37. Re: Topband: Ferrite Cores (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 06 Aug 2014 17:50:56 -0700; I'm retired, and in giving back mode. :) 73, Jim _________________ Topband Reflector Archives - http://www.contesting.com/_topband; /archives//html/Topband/2014-08/msg00061.html (9,885 bytes)
38. Re: Topband: Ferrite Cores (score: 1): Author: "Charlie" <charlie-cunningham@nc.rr.com>; Date: Thu, 7 Aug 2014 14:22:16 -0400; I've mostly used 73 mix tubular and binocular Fair-Rite cores of all sorts of common-mode chokes on coax and for matching transformers 160/80m receiving loops and for input match to my 3-500ZG amp. H; /archives//html/Topband/2014-08/msg00064.html (14,746 bytes)
39. Re: Topband: Ferrite Cores (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 7 Aug 2014 13:37:24 -0500; first. I'll have to study that a little closer sometime. :-) 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://www.contesting.com/_topband; /archives//html/Topband/2014-08/msg00065.html (10,346 bytes)
40. Re: Topband: Ferrite Cores (score: 1): Author: Bill Wichers <billw@waveform.net>; Date: Fri, 8 Aug 2014 00:24:34 +0000; My cores arrived yesterday. I haven't done any electrical testing on them yet, but mechanically they appear to be fine. They were not "crumbly" as some were concerned about. I don't think they are as; /archives//html/Topband/2014-08/msg00066.html (12,688 bytes)

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