- 1. [TowerTalk] Measuring Ferrite (score: 1)
- Author: "Earl Morse" <kz8e@wt.net>
- Date: Thu, 10 Apr 2014 13:58:06 -0700
- I confess, I am spoiled. I have access to a plethora of RF devices such as network and impedance analyzers so I wouldn't have to make do with making this measurement with a rigged up setup. BUT, if I
- /archives//html/Towertalk/2014-04/msg00186.html (12,059 bytes)
- 2. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Thu, 10 Apr 2014 14:38:30 -0700
- Actually, measuring ferrite chokes is not nearly as easy as it looks. The only stand alone instrument I would trust the the HP impedance analyzer. All reflection-based analyzers have the limitation o
- /archives//html/Towertalk/2014-04/msg00189.html (8,545 bytes)
- 3. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Thu, 10 Apr 2014 20:47:35 -0700
- On 4/10/14 2:38 PM, Jim Brown wrote: On 4/10/2014 1:58 PM, Earl Morse wrote: I confess, I am spoiled. I have access to a plethora of RF devices such as network and impedance analyzers so I wouldn't h
- /archives//html/Towertalk/2014-04/msg00216.html (8,328 bytes)
- 4. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
- Date: Sat, 12 Apr 2014 14:25:26 -0700
- If you just want to identify what type of ferrite you have, the easiest thing to do is measure the frequency at which the phase of the impedance is 45 degrees and then compare this to the frequency w
- /archives//html/Towertalk/2014-04/msg00237.html (7,970 bytes)
- 5. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Sat, 12 Apr 2014 15:20:09 -0700
- That's a great idea, Rick -- if you have access to a test rig with sufficiently low stray to get accurate data at that frequency and at that impedance. W1HIS came up with a simple method to identify
- /archives//html/Towertalk/2014-04/msg00240.html (10,081 bytes)
- 6. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
- Date: Sat, 12 Apr 2014 20:37:51 -0700
- The stray problem can be alleviated somewhat by using just one turn, since you are just trying to identify the material. With one turn, the impedance will be minimized. Rick N6RK ___________________
- /archives//html/Towertalk/2014-04/msg00255.html (8,008 bytes)
- 7. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: Steve Hunt <steve@karinya.net>
- Date: Sun, 13 Apr 2014 09:31:11 +0100
- That method can work well if you simply want to distinguish between a couple of cores with widely spaced "cross-over" frequencies; but if the core is a complete unknown, it may not work so well. For
- /archives//html/Towertalk/2014-04/msg00261.html (8,495 bytes)
- 8. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: "Ray, W4BYG" <w4byg@att.net>
- Date: Mon, 14 Apr 2014 07:36:48 -0400
- The URL: http://home.earthlink.net/~w6rmk/ferrite.htm States: Identifying Mystery Ferrites You've seen a big box of cheap ferrites at the surplus place. What kind of ferrite are they? What's their pr
- /archives//html/Towertalk/2014-04/msg00285.html (10,433 bytes)
- 9. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Mon, 14 Apr 2014 04:40:55 -0700
- The URL: http://home.earthlink.net/~w6rmk/ferrite.htm States: Identifying Mystery Ferrites You've seen a big box of cheap ferrites at the surplus place. What kind of ferrite are they? What's their pr
- /archives//html/Towertalk/2014-04/msg00286.html (9,344 bytes)
- 10. Re: [TowerTalk] Measuring Ferrite (score: 1)
- Author: J Chaloupka via TowerTalk <towertalk@contesting.com>
- Date: Fri, 25 Apr 2014 12:11:54 -0700 (PDT)
- test True, if you want to characterize, but if you're in the "sorting by mix" mode, I think a lot of fairly simple test equipment can do the job. You're looking for mu changes of a factor of 5 or 10,
- /archives//html/Towertalk/2014-04/msg00529.html (9,919 bytes)
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