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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Multi-Layer Coil Calculator Nomograph
July 1952 Radio & Television News Article

July 1952 Radio & Television News
July 1952 Radio & Television News Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio & Television News, published 1919-1959. All copyrights hereby acknowledged.

Plenty of single-layer coil (inductor) winding calculators, charts, and nomographs can be found on the World Wide Web, but finding one for multi-layer coils is a bit harder - until now. Actually, this Multi-Layer Coil Calculator Nomograph appeared in a 1955 issue of Radio & Television News magazine. It was an era long before personal calculators, computers, and smartphones, when long-hand written-out problem solving was the norm, and slide rules made such tasks easier for those fortunate enough to know how to work one. I did a little head scratching upon encountering the term "no. 27 d.c.c. wire," not being familiar with the "d.c.c." part. A little research turned up that it means "double cotton covered" for insulation, and there was also "s.c.c." for single cotton covered. Belden and Alpha used to make it. Enamel-covered wire is now used for winding coils and transformers. As you might expect, some companies who specialize in replicating vintage components still make the cotton-covered wire (here's another), or at least something that looks like it but is better quality.

Multi-Layer Coil Calculator Nomograph

Multi-Layer Coil Calculator Nomograph, July 1952 Radio & Television News - RF CafeBy S. Yamasita

A nomograph for determining multi-layer coil inductance on the basis of the H. A. Wheeler inductance equation.

An example will serve to illustrate the use of this nomograph. Assume a coil of one inch mean diameter (2a) and a width and thickness of one-half inch (b and c), wound with 500 turns of no. 27 d.c.c. wire. A line is drawn through the "mean diameter" and "width" scales to the reflect axis, then back to the "mean diameter" scale through the "thickness" scale. A line is then drawn vertically until it intercepts the curve, and then horizontally to the right-hand side of the graph. From this point, a line is drawn to the proper point on the "mean dia." scale, thus locating a point on the "cross axis." A straight line through this point and the proper point on "total no. of turns" scale locates the inductance. By proper manipulation, the nomograph can assist greatly in designing a coil of a specified inductance.

 

 

Posted September 30, 2021

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