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71837Re: Quick question about winding Transformers

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  • joelweder
    Jan 21, 2013
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      Hi Alan and all,

      I read that page several times before sending my first email, but it does not deal with how to interpret this very cryptic statement:

      0.69uH: 16T/2x8T bifilar #30 on T25-6 (yellow) 9" (top)

      As this sort of statement is used in the build instructions it would be a very good idea to show the poor suffering (non scientist!) ham builder how to interpret it. Preferably right there in the build notes, not off on some link elsewhere. (the page already has all sorts of information, so why not add this?)

      Look at this: "16T/2x8T" How are we to interpret this? 16 turns divided by 2? Multiplied by 8 turns? A little English goes a long way to clearing up confusion. After a lot of extra reading in this forum I THINK I've figured it out:

      16 turns of #30 on a T25-6, using 9" of wire.
      Then take another 9" of wire (not mentioned in the instructions) and cut it in two. Twist the resulting two pieces together then add to the T25-6 as 8 turns overlapping the 16 turns already added.

      In the specific step in question the text in the "Component Top/Bottom" column could be changed to something like:

      16T #30 9", 8T bifilar 2x4.5" #30, on T25-6 (yellow)(top)

      Using text that minimizes confusion results in a lot fewer questions on the forum, lower stress level for those involved, and a higher success ratio on the project.

      I realize that lots of volunteers have been doing their best on this over a period of several years, but when you get too close to the project you can lose perspective and think that something like "0.69uH: 16T/2x8T bifilar #30 on T25-6 (yellow) 9" (top)" makes total sense to everyone...

      Joel VE6EI

      --- In softrock40@yahoogroups.com, "Alan" wrote:
      > ----- Original Message -----
      > Subject: [softrock40] Re: Quick question about winding Transformers
      > >I presume this question is about winding of T5 in the RxTx? I'm trying to interpret this myself and it is simply not in the least
      > >clear, either in the cryptic code-like way of describing the winding process in the "Component Top/Bottom" column in the
      > >instructions, or anywhere else on the website that I've yet found.
      > >
      > > I'm pretty darn sure that T5 is a source of frustration for a lot of builders. How about adding a note IN THE BUILD INSTRUCTIONS
      > > explaining clearly how to wind it? This email chain is the only place I've seen anything about it but even here I'm not 100% sure
      > > what to do...
      > >
      > Joel,
      > There is a link to this page http://www.wb5rvz.com/sdr/common/Common_Component_Mounting.htm#toroid_coils which has information and
      > further links.
      > If this is not enough then let us know.
      > If the link is not on the page where you were looking let Robby know.
      > 73 Alan G4ZFQ
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