Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives Magazine Sponsor RF Cafe Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Alliance Test Equipment Centric RF Empower RF ISOTEC Reactel RF Connector Technology San Francisco Circuits Anritsu Amplifier Solutions Anatech Electronics Axiom Test Equipment Conduct RF Copper Mountain Technologies Exodus Advanced Communications Innovative Power Products KR Filters LadyBug Technologies Rigol TotalTemp Technologies Werbel Microwave Windfreak Technologies Wireless Telecom Group Withwave Sponsorship Rates RF Cafe Software Resources Vintage Magazines RF Cafe Software WhoIs entry for RF Cafe.com Thank you for visiting RF Cafe!


everythingRF RF & Microwave Parts Database (h1)

Werbel Microwave (power dividers, couplers)
Exodus Advanced Communications Best in Class RF Amplifier SSPAs - RF Cafe

Day in Engineering History Archive - June 30

Day in Engineering History June 30 Archive - RF CafeJune 30

Special Relativity Published - RF Cafe1879: The California Electric Light Company was organized in San Francisco, becoming the first electric company formed to produce and sell electricity 1905: Albert Einstein published his theory on special relativity, "On the Electrodynamics of Moving Bodies." 1908: An unexplained explosion in Tunguska, Siberia knocked down trees in a 40-mile radius and knocked people unconscious 40 miles away. 1930: The first round-the-world broadcast from the U.S. used a series of short-wave radio relays and took one-eighth of a second. 1946: The first atomic bomb dropped from an airplane over water occurred over the Bikini Atoll onto a target group of 73 scrapped ships. 1948: The invention of the transistor was announced by Bell Laboratory. 1948: The first telephone recording devices were authorized for public use in the U.S., and required a periodic "beep" to alert the users. 1953: The first Corvette rolled off the Chevrolet assembly line (it sold for $3,250). 1961: Dr. Lee de Forest, inventor of the Audion tube, died. 1971: Three cosmonauts aboard Soyuz 11 were found dead inside their spacecraft after it had returned to Earth. 1972: The first leap second time correction was added.

| 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.

Copper Mountain Technologies (VNA) - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright:
1996 - 2024

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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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 | My Daughter's Website: EquineKingdom

LadyBug RF Power Sensors

Rigol DHO1000 Oscilloscope - RF Cafe

PCB Directory (Manufacturers)