RF Cafe Software

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 11

February 11

Thomas Alva Edison's Birthday - Please click here to visit RF Cafe.1650: French mathematician René Descartes, after whom the Cartesian coordinate system was named, died. 1809: Robert Fulton patented the steamboat. 1812: Massachusetts Gov. Elbridge Gerry signed a re-districting law that favored his party (the map looked like a salamander) - giving rise to the term "gerrymandering." 1813: Swedish physicist Anders Ekeberg, discoverer of the element tantalum (Ta), was born. 1847: American inventor Thomas Alva Edison was born in Milan, OH. 1868: Jean Foucault, inventor of the Foucault pendulum, died. 1915: Richard Hamming, of error correction code fame, was born. 1970: Osumi, the first Japanese satellite, was launched and made Japan the fourth country to put a satellite into earth orbit. 1973: The National Inventor's Hall of Fame was founded by the USPTO, and new inductees are added on this founding date. 1975: The Tories choose Margaret Thatcher as its first woman leader. 2005: Samuel Alderson, inventor of the crash test dummy, died.

| 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.