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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...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Delco Radio Advertisement - Control of the Air
April 1945 QST Article

April 1945 QST

RF Cafe - April 1945 QST CoverTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from QST, published December 1915 - present (visit ARRL for info). All copyrights hereby acknowledged.

Here is an advertisement for Delco radios that I scanned from page 91 of my copy of the April 1945 QST magazine. "'Control the Air' has a new meaning today." That's the tag line referring to the need to dominate wireless communications in the effort to conduct effective warfare. Radio certainly wasn't a new science in 1945, but secure communications - including spread spectrum techniques - was a vital technique both for transmitting and receiving messages and for jamming the communication of our enemies. Even though Hollywood actress Hedy Lamarr and music composer George Antheil  came up with the concept of frequency hopping spread spectrum in the early years of World War II, the U.S. Department of War (now known by the more socially acceptable and less formidable handle of Department of Defense) stuck mostly with codebook encryption techniques through the end of the war. Delco, as was common in the World War II era, encouraged citizens to buy War Bonds.

Delco Radio Advertisement

Delco Advertisement - Control of the Air, April 1945 QST - RF Cafe

Delco Advertisement

 

 

Posted October 14, 2019(original 11/14/2012)

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