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Stenode Corporation of America Advertisements
August 1931 Radio-Craft

August 1931 Radio-Craft

August 1931 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

Stenode tubes were a big deal in the early 1930s, and were deemed capable of changing fundamentally the way high selectivity receivers and transmitter preamplifiers would be designed. History had other plans for RF circuit design. Note that both advertisements include the signature of Stenode tube inventor Dr. James Robinson. The Stenode's success was dependent upon being able to design a receiver circuit with the ability to "recreate" sidebands from the carrier. That presents a dilemma mathematically since the information in an ideal AM scheme is contained entirely in its sidebands. If the sidebands are removed, that information is lost forever unless it is present somewhere else, like on the carrier itself, which means pure amplitude modulation is not occurring. It is commonplace to recover a suppressed carrier from the sideband(s), but recovering the sidebands from a pure sinewave carrier is impossible. See articles Stenode's Selectivity Revolutionary and The Stenode Radiostat System.

Stenode Corporation of America Advertisements

Stenode Corp. of America Ad on Page 109, August 1931 Radio-Craft - RF Cafe

Stenode Corp. of America Ad on Page 109

Stenode Corp. of America Ad on Page 113, August 1931 Radio-Craft - RF Cafe

Stenode Corp. of America Ad on Page 113

 

 

Posted August 7, 2023
(updated from original post on 11/18/2015)

Temwell (RF components)

About RF Cafe

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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