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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.

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 AirplanesAndRockets.com

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Day in Engineering History Archive - September 11

September 11

9-11 Heroes Medal of Valor. Click here to return to the RF Cafe homepage.

9/11 terrorist attack - the PentagonSeptember 11, 2001: 19 members of the extremist Muslim terrorist group al-Qaeda, used four hijacked aircraft to crash into the twin World Trade Center buildings, the Pentagon, and a field in Shanksville, 9/11 terrorist attack - twin towers of the World Trade CenterPA. The final death toll includes nearly 3000 souls on the planes, in the ground targets, and rescue personnel. Many countries have joined the fight against terrorism, many appease out of cowardice, and many actively abet the enemy. We build up, they tear down. We spread freedom, they spread tyranny. 9/11 terrorist attack - firemen raising flag at Ground ZeroWe heal the sick, they kill and maim. Every citizen of the world pays the price in lost opportunity due to resources expended fighting the terrorists. We shall defeat this enemy both from without and from within - no apologies.

9/11 terrorist attack -  Shanksville, PA1816: German optician Carl Zeiss, of precision optics fame, was born. 1845: Jean-Maurice-Émile Baudot, who created a telegraphic code that eventually replaced Morse Code, and after whom the term "baud" is named, was born. 1884: Harvey Fletcher, who first demonstrated stereophonic sound, was born. 1937: Astronaut Robert Crippen, who piloted the first Space Shuttle, Columbia, was born. 1946: The first mobile long-distance car-to-car telephone conversation took place between Houston, TX, and St. Louis, MI. 1997: The Mars Global Surveyor went into orbit around Mars.

| 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.