Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

Day in Engineering History Archive - April 30

| 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.

April 30

Happy Birthday to Happy Birthday Johann Carl Friedrich Gauss!  Please click here to visit RF Cafe.

1777: German mathematician and experimenter in magnetism Carl Friedrich Gauss was born. 1897: J.J. Thomson first announced the existence of electrons at the Royal Institution Friday Evening Discourse. 1900: Famous railway engineer Casey Jones met his end in a collision with another train crossing his track. 1945: As Russian troops approached his Berlin bunker, Adolf Hitler committed suicide along with his wife of one day, Eva Braun. 1955: Mendelevium, element 101, was announced. 1964: The FCC ruled that all TV receivers should be equipped to receive both VHF (channels 2-13) and the new UHF (channels 14-83). 1975: The Vietnam War ended when the government in Saigon announced its unconditional surrender to the Vietcong - a slaughter ensued thereafter. 1997: London's Big Ben ground to a halt for hours. 2001: California businessman Dennis Tito arrived at the international space station aboard a Russian spacecraft.


A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel