Stenode Corporation of America Advertisements
August 1931 Radio-Craft

August 1931 Radio-Craft [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

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