RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
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Calculator Workbook
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RF & EE Symbols Word
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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.

My Hobby Website:
 AirplanesAndRockets.com

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Day in Engineering History Archive - February 23

February 23

Iwo Jima Flag Raising. Click here to return to the RF Cafe homepage.1836: The siege of the Alamo began in San Antonio, TX. 1855: German mathematician and experimenter in magnetism Carl Friedrich Gauss died. 1886: Charles Hall separated aluminum for ore using an electrolytic process. 1893: Rudolf Diesel (I kid you not) received a German patent for the diesel engine. 1927: The Federal Radio Commission (FRC, later became the FCC) began assigning frequencies, hours of operation and power allocations for radio broadcasters. 1936: The first (and last) rocket-powered air mail flight was made from Greenwood Lake, NY to NJ in the rocketplane Gloria. 1944: Leo Baekeland, inventor of Bakelite, which played a large role as an insulator in early electronics, died. 1945: U.S. Marines raised the American flag on Iwo Jima, creating the subject for the infamous photo & statue. 1954: The first mass inoculation of children against polio with the Salk vaccine began in Pittsburgh, PA. 1987: At 10:42 am, the Minister for Communications for Australia received his country's first official call via an analogue mobile phone. 1995: The Dow Jones Industrial Average (DJIA) closed above 4,000 for the first time. 1997: A fire erupted on the Mir space station. 2006: The 1 billionth tune was downloaded from the iTunes music store website.

| 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.