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September 1939 QST
Table of Contents

September 1939 QST

September 1939 QST Cover - RF CafeTable 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.

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September 1939

Vol. XXIII, Number 9

 

Hetrofil - An Aid to Selectivity, by Raymond W. Woodward 11
High-Q Tank Circuit for Ultra-High Frequencies, by Arnold Peterson 19

 

September 1939 QST Table of Contents - RF Cafe

 

 

Posted May 11, 2016
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Copyright: 1996 - 2024

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    Kirt Blattenberger,

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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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