This new tool may be of interest to at least a few TowerTalk folks. Currently being discussed, with some sample illustrations, here: https://forums.qrz.com/index.php?threads/new-tool-toroidal-ferrite
<This new tool may be of interest to at least a few TowerTalk folks. <Currently being discussed, with some sample illustrations, here: < https://forums.qrz.com/index.php?threads/new-tool-toroidal-fer
On 6/16/21 8:33 AM, jim.thom jim.thom@telus.net wrote: On a side note, N3RR, Bill Hider, a few yrs ago, bought 700 (seven hundred) of the type 31, 2.4 inch OD cores...from I think, Fair rite..... and
No, I studied both the larger cores and the more commonly used 2.4-in o.d. cores, and MOST of my designs are for the 2.4-in cores. As per number of turns, is this for wire, or coax, or can be used fo
All that data went into a spreadsheet, with data points at limits of 160, 80, and 40M bands, centered in 20 and 15, and at around 28.5 MHz, and for each winding (turns, winding material), worst case
I'd have to look at the spreadsheets -- it's been three years. But because resonances are involved, f the parameters I measured, Rs, Xs, and Zmag at a given frequency for a 10-turn winding, almost 2:
I'd have to look at the spreadsheets -- it's been three years. But because resonances are involved, f the parameters I measured, Rs, Xs, and Zmag at a given frequency for a 10-turn winding, almost 2:
Yes. Another rabbit hole. :) Jim _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contestin
Yes. Another rabbit hole. :) Jim _____________ This is why at work, I do the initial calculation to see if it's doable at all, and then let someone who actually knows about magnetics actually do the
The TFCI Calculator is not usable with either OpenOffice or OfficeLibre. The calculator does much of its work by using Excel's Visual Basic for Applications macro language. Neither OpenOffice nor Off
Amidon is not a manufacturer, they are a distributor/reseller, and they've been selling stuff at VERY high markups (like $15 for a part that costs them less than $3) for years, having invented part n
On 6/16/21 4:07 PM, Jim Brown wrote: On 6/16/2021 2:39 PM, Dan Maguire wrote: I never found an actual datasheet for Amidon type 31. A link to a page showing the u'/u'' plots, not just physical dimen
In 1980 I was traveling a week at a time from Tucson to Conoga Park on business. Working on some personal project I needed some toroids and I actually visited Amidon's garage while I was in the neigh
Jacek, SP3L, had some trouble posting so he asked me to relay his answers to a few of the questions posed by VE7RF. - Dan, AC6LA == Hello Guys, please forgive me if I do something wrong - I am using
Jacek, SP3L, had some trouble posting so he asked me to relay his answers to a few of the questions posed by VE7RF. - Dan, AC6LA == Here are my answers to VE7RF questions. use 5 x cores, type 31, 2.4
Note that it matters greatly the ORDER in which turns pass through the toroid core. Out of order turns (that overlap each other, what happens with scramble winding) cancel each other. This one of the
Version 2.0 of the Toroidal Ferrite Core Inductor calculator is now available. Details with illustrations and a link to download are available here: https://forums.qrz.com/index.php?threads/new-tool-
It's quite interesting working with the choke calculator, but I notice that the Rs values differ significantly from K9YC's Choke Cookbook. For example, with a Fair-Rite 2.4" #31 toroid, on 28.4 MHz,
Hi Dave, Ferrite common mode chokes are parallel resonant circuits, formed by stray (parasitic) capacitance between turns, inductance and resistance coupled from the core. That capacitance will depen
Jim's Cookbook data assumes "worst case" for any given configuration, meaning that if you happen to use a core with "less than optimal" permeability characteristics your |Z| and R response will still