Radio engineering time travel - 1927
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Radio engineering time travel (1927)
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The Reason for Matching Impedances
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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.
The Vacuum Tube as an Amplifier
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The Vacuum Tube as an Amplifier
By B. F. McNamee
Radio for July, 1922
The type of vacuum tube used as an amplifier is the "hard" or high vacuum tube. The vacuum is so nearly perfect that there is no noticeable effect of gas molecules; in fact, for practical purposes it may be considered a perfect vacuum. The "soft" tube, that is one containing a certain small pressure of gas and intended for use as a detector, can be used to a certain extent for amplification purposes. However this almost always results in distortion which would prohibit its use as an amplifier in radio telephone work, and its use is also restricted because it will not work with high plate voltage, thus limiting the strength of signals that can be obtained.
Ease of C.W. Transformer Design
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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.
Perfume by radio
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PERFUME BY RADIO
Radio for March, 1922
By JOHN P. MEDBURY
A russian scientist claims to have invented a machine which will send 'perfume by wireless. A man in Boston can buy a dime's worth of perfume at the 10 -cent store and sprinkle his girl in St. Louis with it. Any kind of an odor can be transmitted. For $1.30, a husband living in New York can chloroform his wife in Los Angeles. If he wants to wait until evening he can do it for 70 cents.