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

Windfreak Technologies Frequency Synthesizers - RF Cafe



Anritsu Test Equipment - 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

Innovative Power Products (IPP) RF Combiners / Dividers

Day in Engineering History Archive - July 31

Day in Engineering History July 31 Archive - RF CafeJuly 31

Samuel Hopkins Awarded 1st U.S. Patent - Please click here to visit RF Cafe.1790: The first U.S. patent was issued to Samuel Hopkins for his process for making potash and pearl ashes. 1792: The foundation stone of the U.S. Mint in Philadelphia was laid. 1918: Francis Stanley (not his twin brother Freelan), famous for their Stanley Steamer automobile, died. 1923: Stephanie Kwolek, inventor of Kevlar, was born. 1937: Charles Hires of root beer fame died. 1965: The last cigarette commercial appeared on British television. 1964: Space probe Ranger 7 transmitted the first close-up images of the moon's surface ever taken by a U.S. spacecraft. 1969: A Moscow police chief reported that thousands of Moscow telephone booths had been made inoperable by thieves who had stolen phone parts in order to convert their acoustic guitars to electric. 1971: Astronauts rode in a vehicle on the moon for the first time in a lunar rover vehicle (LRV). 1998: IBM's Russian subsidiary agreed to pay $8.5 million in fines for selling powerful computers ultimately destined for a Russian nuclear weapons laboratory. 2003: Felix Baumgartner was the first to cross the English Channel by unpowered flight when he jumped from 30,000-ft and glided 22 miles wearing a birdman suit.

| 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.

Innovative Power Products (IPP) RF Combiners / Dividers
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe



RF Cascade Workbook 2018 by RF Cafe