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Copyright: 1996 - 2024


    Kirt Blattenberger,


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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April 1969 Electronics World
Table of Contents

April 1969 Electronics World

April 1969 Electronics World Cover - RF Cafe  Table of Contents 

Wax nostalgic about and learn from the history of early electronics. See articles from Electronics World, published May 1959 - December 1971. All copyrights hereby acknowledged.

April 1969

Vol. 81, No. 4


Ionospheric-Propagation Predictions, by H. Charles Wood 27
Importance of Filters, by A. H. Seidman 37
LC Filters, by Stephen Rosenfield 40
Practical Operating Limits for Filters 44
Filters for Microwaves, by Robert Felsenheld 45
R. F. Interference Filters, by Benedict Rosen 48
Crystal Filters, by Robert L. Kent   50
Ceramic Filters, by Reg Zimmerman 53
Beads Block Noise 55
Mechanical Filters, by Donovan A. Southworth 56
Active Filters, by James L. Hogin 58
UJT Monocycle Multivibrator 61
Mac's Service Shop: Keeping Abreast of Your Field, by John T. Frye 62
Tech-Themed Comic 63


April 1969 Electronics World Table of Contents - RF Cafe



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