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Radio engineering time travel -1929

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Radio engineering time travel (1929)

I invite you to look at the "pictures" related to radio technology. They come from various sources. The gallery has its sister version in Polish and Russian. Versions in other languages will be added successively. More detailed descriptions can be found in other language versions (articles are related and can be displayed by clicking on the icons with flags on the left, top of the TRIODA website). Of course, I will complement translations of signatures quite slowly. All descriptions are displayed using the present tense and not the past - this is not a mistake only deliberate action - a reference to the original descriptions from those years. In order not to delay the possibility of viewing the gallery, this site is made available as a "site under construction" - for which I apologize to all guests. At the beginning and end of each set of photographs there are links allowing to change the period - calendar year.

Radio engineering time travel - 1927

Details: Category: Articles; Hits: 324

Radio engineering time travel (1927)

The Reason for Matching Impedances

Details: Category: Articles; Hits: 434

The Reason for Matching Impedances
By Samuel C. Miller (Radio for May, 1924)

Here is a simple explanation of why the input impedance of a transformer or phone should equal the output impedance of the vacuum tube. In view of the more.intelligènt design of a receiving set thus made possible, it is to be hoped that transformer manufacturers will include this information in their specifications.

Ease of C.W. Transformer Design

Details: Category: Articles; Hits: 462

Ease of C. W. Transformer Design
Radio for February, 1922
By A.H. Babcock

A year or so ago, one of my sons came to me with a transformer core he had traded-in, and asked, "How can I tell how many turns to wind on this for a 110 volt circuit ?" Here was a practical question that demanded an answer in terms a school-boy could understand and apply to every-day use. The answer was found in such simple form that he wound that core, tried it in service, and then went around the neighborhood hunting up transformers to design-for an adequate fee - which his father did not share; another example of the manner in which a business man commercializes the technical knowledge of an engineer.

How to Design an Iron Core Audio Frequency Choke Coil

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How to Design an Iron Core Audio Frequency Choke Coil
By A. K. Aster, Ph. D., University of California
Radio for July, 1922

The design of a choke coil may be determined f r o m five factors, namely: the inductance of the coil, the length of the magnetic field, the area of the core, the permeability of the iron, and the number of turns of wire. As two or more of these factors are likely to be unknown at the outset, it is necessary to assume certain values for them, so that we may determine approximate values for the other factors. To design a coil for a definite inductance, we must proceed more or less by trial, making reasonable assumptions and trying them out in the formula. If the desired result is not obtained, we make some changes and try again, until after several trials the desired value is obtained.

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