Search RFCafe.com                           
      More Than 18,000 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 | Groups


 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 for Visio | RF Symbols for Visio
RF Symbols for Office | Cafe Press
Espresso Engineering Workbook

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

Copper Mountain Technologies (VNA) - RF Cafe

Werbel Microwave (power dividers, couplers)

Windfreak Technologies Frequency Synthesizers - RF Cafe

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

PCB Directory (Manufacturers)

Day in Engineering History Archive - August 21

Day in Engineering History August 21 Archive - RF CafeHawaii Became the 50th State - Please click here to visit RF Cafe.August 21

1789: Augustin-Louis Cauchy, French mathematician, was born. 1858: The famous debates between senatorial contenders Abraham Lincoln and Stephen Douglas began. 1878: The American Bar Association was founded in Saratoga, NY. 1888: William Burroughs of St. Louis, Missouri, received a patent on the first commercial adding machine. 1923: The first use of electric beacons mounted on the ground to provide sight direction for night flying was made. 1951: The U.S. ordered construction of the world's first atomic submarine, the Nautilus. 1958: Hawaii became the 50th state. 1965: Gemini V was launched into Earth orbit with Gordon Cooper and Charles Conrad aboard. 1972: Don Cameron became the first person to pilot a hot air balloon across the Alps. 1991: A hard-line coup against Soviet President Mikhail Gorbachev collapsed in the face of a popular uprising led by Russian federation President Boris Yeltsin. 1993: Contact was lost with the Mars Observer spacecraft. 1996: Netscape browser 3.0 was released. 2024: The next total solar eclipse (April 8) will be visible from North America, and the path of totality will pass through my yard!

| 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.

PCB Directory (Manufacturers)
LadyBug RF Power Sensors

Anatech Electronics RF Microwave Filters - RF Cafe

Innovative Power Products (IPP) Directional Couplers