Transformer instructions vague

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Transformer instructions vague

Postby mrwizardly » Sun Jan 25, 2015 4:11 am

Peaberry SDR V2
The instructions 60/40 - 30/20 for T3 indicate:
3.240uH 30T 2x15t
T30-6 18" 2x10" #30

Does this indicate the bifiler wire is 2x15 turns and then 18" of single wire wound 20 times?
It's a little confusing. I don't know if the single wire should be another bifiler wire of just how many turns it should contain?
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Re: Transformer instructions vague

Postby mrwizardly » Sun Jan 25, 2015 4:31 am

Addendum:
The 2x10" give the impression there are "two" bifiler windings on T3.
I read a similar post and this seems to be the confusion that the extra 2x10" gives the notion there are "two" bifiler windings.
The instructions elude to the same thing and the other post I read.
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Re: Transformer instructions vague

Postby mrwizardly » Sun Jan 25, 2015 4:36 am

Addendum:
I found the earlier post that did some explanation: Transformer winding translation (Search)

The question that needs answering is: Are there any transformers that have "two sets" of bifiler windings?
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Re: Transformer instructions vague

Postby kz1x » Sun Jan 25, 2015 2:42 pm

The wire notation indicates how you are supposed to prepare the raw materials.

2x10" means "cut two ten inch pieces of wire."

The number of turns made with it, any bifiliarity, and other construction details, are a separate instruction.

T2, T3, T4, and T5 each have one bifiliar winding, according to my memory. You should check the schematic to verify.
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Re: Transformer instructions vague

Postby mrwizardly » Tue Jan 27, 2015 2:50 am

Why are there instructions to "cut two ten inch pieces of wire." if only 1 will be used and it's not bifilar?
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Re: Transformer instructions vague

Postby W4MMP » Tue Jan 27, 2015 3:23 am

Hello,
I'm not sure where the confusion lies but here is the explanation for winding T3.

The way to read the chart (T3) 60/40/30/20. Read it as if the data is in columns and read down each column.

3.240uH
T30-6
Core

30T
18" (30 turns-single wire winding, 18" long)
single wire winding

2x15T
2x10" (Cut a wire to 20" and bend in half and twist it) 15T turns bifilar
bifilar winding

And obviously the #30 is the wire size to use for both windings.
The bottom line is cut one wire 18" long and use it for a single wire winding of 30 turns. Cut another wire 20" long, bend in half and twist it. Use that for the bifilar winding of 15 turns. The instructions indicate for ease of winding wind the bifilar first and then the single wire winding on top of the bifilar.
Hope this helps.
73
Ron / W4MMP
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Re: Transformer instructions vague

Postby kz1x » Tue Jan 27, 2015 4:09 am

Perhaps it's not clear to the builder in question how to construct the bifiliar winding that is 10" long.

Your detail was better than mine, depending on the desired technique. (But all of it assumes a certain knowledge.)

I also prefer to have the 'hook' for threading that results when you fold the wire in half; my aptitude for using two separate pieces of wire comes from having two colors, which would have been better.

The Toroid Guy uses red and green for this reason.

Back in the early 80s I had twin conductor zip enamel wire, in two colors. Wish I could get that stuff again.
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Re: Transformer instructions vague

Postby mrwizardly » Wed Jan 28, 2015 6:27 am

Thanks Ron, et-al.
Sounds much clearer than looking at two pages and trying to decipher it.
This explanation was even clearer than my first referenced explanation.

This just felt like a brick wall. I didn't want to go on until I had this clarified.
Onward, now.
Mark
73s (case closed)
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