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RF Cascade Workbook 2005 - RF Cafe
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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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

My Hobby Website:
 AirplanesAndRockets.com

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Day in Engineering History Archive February 20


February 20

Ludwig Boltzmann's Birthday - Please click here to visit RF Cafe.1844: Ludwig Boltzmann, after whom the Boltzmann constant (1.3806505 × 10-23 J/K) was named, was born. 1877: The first cantilever bridge in the U.S. was completed in Harrodsburg, KY. 1931: John Milnor, who proved that a 7-dimensional sphere can have 28 different differential structures - important work to be sure - was born. 1948: The first B-50 Superfortress bomber was delivered to the Air Force. 1956: German physicist Heinrich Barkhausen, who discovered the effect named after him regarding changes in the magnetic domain properties of metal, died. 1962: Astronaut John Glenn became the first American to orbit Earth as he flew 3 times around the earth aboard the Friendship 7 Mercury capsule. 1965: The Ranger 8 spacecraft crashed on the moon after sending back thousands of pictures of the lunar surface. 1986: The Soviet Union launched the Mir space station into orbit. 1993: Ferruccio Lamborghini, of sports car fame, died. 2005: Spain became the first country to vote in a referendum on ratification of the proposed Constitution of the European Union.

| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in this article, there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative sources. On RF Cafe, events with hyperlinks have been verified.
Please submit significant historical events and dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death date ;-) A couple years ago, I began commemorating the birthdays of notable people and events with special RF Cafe logos. Where available, I like to use images from postage stamps from the country where the person or event occurred.