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Day in Engineering History Archive February 14

| 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.

February 14

Happy Valentine's Day!  Please click here to visit RF Cafe.

Today is Valentine's Day. 1876: Alexander Bell filed an application for a patent for the telephone. 1877: American radio pioneer Greenleaf Pickard, inventor of the crystal detector, was born. 1924: International Business Machines (IBM) was born when Computing- Tabulating- Recording Company  formally changed its name. 1943: German mathematician David Hilbert, of Hilbert Transform fame, died. 1950: American physicist Karl Jansky, the "Father of Radio Astronomy" who discovered the cosmic background radiation, died. 1961: Lawrencium (Lr, 103) was produced at University of CA, Berkeley. 1989: The first operational satellite of the Global Positioning System (Block II) was placed into orbit around Earth.


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

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio

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