Search RFCafe.com                           
      More Than 17,000 Unique Pages
Please support me by ADVERTISING!
Serving a Pleasant Blend of Yesterday, Today, and Tomorrow™ Please Support My Advertisers!
   Formulas & Data
Electronics | RF
Mathematics
Mechanics | Physics
     AI-Generated
     Technical Data
Pioneers | Society
Companies | Parts
Principles | Assns


 About | Sitemap
Homepage Archive
        Resources
Articles, Forums Calculators, Radar
Magazines, Museum
Radio Service Data
Software, Videos
     Entertainment
Crosswords, Humor Cogitations, Podcast
Quotes, Quizzes
   Parts & Services
1000s of Listings
 Vintage Magazines
Electronics World
Popular Electronics
Radio & TV News
QST | Pop Science
Popular Mechanics
Radio-Craft
Radio-Electronics
Short Wave Craft
Electronics | OFA
Saturday Eve Post

Software: RF Cascade Workbook
RF Stencils Visio | RF Symbols Visio
RF Symbols Office | Cafe Press
Espresso Engineering Workbook

Aegis Power  |  Alliance Test
Centric RF  |  Empower RF
ISOTEC  |  Reactel  |  RFCT
San Fran Circuits

ConductRF Phased Matched RF Cables - RF Cafe

Exodus Advanced Communications Best in Class RF Amplifier SSPAs

Noisecom

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Day in Engineering History Archive - September 11

Day in Engineering History September 11 Archive - RF CafeSeptember 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, PA. 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 9/11 terrorist attack - twin towers of the World Trade Centercowardice, 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.

1816: 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 9/11 terrorist attack -  Shanksville, PAstereophonic 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. Many 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. Images used in the logos are often from open source websites like Wikipedia, and are specifically credited with a hyperlink back to the source where possible. Fair Use laws permit small samples of copyrighted content.

Rigol DHO1000 Oscilloscope - RF Cafe

Anatech Electronics RF Microwave Filters - RF Cafe

Temwell Filters