It is a well-know fact that search engine rankings are enhanced when quality websites contain reciprocal links to each other. If I have listed your company on RF Cafe and you have not yet provided a reciprocal link, please consider using one of the following prepared links of either text or a graphic. RF Cafe does NOT purposely provide links to "keyword magnet" sites that exist purely to lure searchers onto their website with the sole purpose of flashing ads in their faces. Those site offer nothing other than a useless list of hyperlinks. Please do not even bother contacting me for a reciprocal link if you run that sort of site. Also, do not send a link request unless you actually work at the company you claim to represent; I am sick of lying website optimizers promising me a reciprocal link on their client's website and then never following through after I list them. RF Cafe returns very highly, often at the top of the list on page one, for many key engineering and scientific keyword searches, and is regarded as a "high quality website" amongst search engines. Having your website linked to from RF Cafe is a definite asset for you that I am happy to provide, since I personally control every listing. Many requests have been rejected over the years either because they applicant's website is not of the quality that RF Cafe visitors need to be exposed to, or because they are simply not relevant. I'm watching your back! Thank-you. - Kirt Blattenberger Many of these logos commemorate people, places, and companies. My intention is to pay tribute to the significance of each. Images have been gathered from all over the Internet; ownership, copyright, legal right to use, etc., are all acknowledged, and are in no way meant to imply any affiliation between RF Cafe and the entity being honored. If you object to the use of an image and are the legal owner, please let me know and I will be glad to remove it. The easy way to use one of the images is to just place your cursor over it, right-click and do "Copy," then simply paste it into your HTML page. The hyperlink, image, and mouse-over description will all paste in automatically. | 
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New Year's Day
January 1 | 
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Happy Birthday Isaac Asimov!
January 2, 1920
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World's First Electric Watch Sold
January 3, 1957
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Sir Isaac Newton's Birthday
January 4, 1643
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Lee de Forest Receives Patent for Triode Tube
January 15, 1907
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Ray Dolby's Birthday
January 18, 1933
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James Watt's Birthday
January 19, 1736
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Edwin "Buzz" Aldrin's Birthday
January 20, 1930
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André-Marie Ampère's Birthday
January 20, 1775
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Uranium Atom 1st Split
January 22, 1939
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AT&T Transcontinental Telephone Line Inaugurated
January 25, 1915
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Edison's Incandescent Bulb Patented
January 27, 1880
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Space Shuttle Challenger Explosion
January 28, 1986
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National Engineer's Week
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National Engineer's Week
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Groundhog Day
February 2
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Super Bowl XLII
February 3, 2008
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Thomas Alva Edison's Birthday
February 11, 1847
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Heinrich Lenz's Birthday
February 12, 1804
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Heinrich Lenz's Birthday
February 13, 1946
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Valentine's Day
February 14 | 
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National Engineer's Week 2007
February 18, 2007
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Svante Arrhenius' Birthday
February 19, 1859
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National Engineer's Week 2008
February 19, 2008
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Ludwig Boltzmann's Birthday
February 20, 1844
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Iwo Jima Flag Raising
February 23, 1945
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"His Master's Voice" Trademarked
February 24, 1925 | 
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Sir Robert Watson-Watt Introduced RADAR
February 26, 1935
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Daylight Saving Time
Begins 2nd Sunday in March
Ends 1st Sunday in November | 
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National Bureau of Standards (now NIST) Created
March 3, 1901
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Jules A. Lissajous' Birthday
March 4, 1822 | 
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Joseph von Fraunhofer's Birthday
March 6, 1787
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Selma-to-Montgomery Freedom March
March 7, 1965 | 
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Gustav Kirchhoff's Birthday
March 12, 1824 | 
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International Pi (p) Day
March 14 (at 1:59:26 o'clock - 3.1415926)
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Beware the Ides of March
March 15
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Georg Simon Ohm's Birthday
March 16, 1789
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St. Patrick's Day
March 17 | 
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Swallows Return to San Juan Capistrano
March 19 | 
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Vernal Equinox (1st day of spring) | 
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Jean Baptiste Joseph Fourier's Birthday
March 21, 1768 | 
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Wilhelm Röntgen's Birthday
March 27, 1845
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Happy Easter
March-April (variable) | April | 
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April Fool's Day
April 1
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World's First Cellphone Call Made
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April 3, 1973 | 
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James Smith McDonnell's Birthday
April 9, 1899
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1st Flight of the Space Shuttle - Columbia
April 12, 1981 | 
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Sir Robert Watson-Watt, "Father of Radar," Born.
April 13, 1892 | 
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Tax Day in the U.S.A.
April 15 | 
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Harriet Quimby Crosses the English Channel Solo
April 16, 1912
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Paul Revere's Midnight Ride
April 18, 1775
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Happy Birthday, Melanie!
April 19, 19-something
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Happy Birthday Jean-Baptiste Biot (Biot-Savart Law)
April 21, 1774 | 
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Edison General Electric Company Founded
April 24, 1889
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Happy Birthday Guglielmo Marconi
April 25, 1874 | 
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Samuel Morse's Birthday
April 27, 1791
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Happy Birthday Johann Carl Friedrich Gauss
April 30, 1777 | May | 
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Hindenburg Disaster
May 6, 1937
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V-E Day (Victory in Europe)
May 8, 1945
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Happy Birthday Gabriel Daniel Fahrenheit
May 14, 1687 | 
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Mother's Day
2nd Sunday in May | 
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Peace Officers Memorial Day
May 15
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Happy Birthday William "Bill" Hewlett
May 20, 1913 | 
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Charles Lindbergh Lands in Paris
May 21, 1927 | 
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John Bardeen Born
May 23, 1908
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Memorial Day - Remember Our Fallen Servicemen!
Last Monday in May | June | 
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Robert Morris Page Born
June 2, 1903
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Edwin White 1st American to Walk in space
June 3, 1965 | 
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D-Day
June 6, 1944
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Jacques-Arsène d' Arsonval Born
June 8, 1851
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First time SOS distress signal was used
June 10, 1909
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Flag Day
June 14
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Happy Father's Day
3rd Sunday in June
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Happy Birthday Blaise Pascal!
June 19, 1623 | 
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Summer Solstice (1st day of summer) | 
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Siméon-Denis Poisson Born
June 21, 1781
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Lord Kelvin Born Today
June 26, 1824 | 
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Augustus De Morgan Born
June 27, 1806
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Treaty of Versailles Signed
June 28, 1919
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George Ellery Hale Born Today
June 29, 1868 | July | 
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Canada Day
July 1 | 
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The Dog Days of Summer Begin
July 3 to August 11
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Independence Day
July 4, 1776 | 
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Solar Challenger Crosses the English Channel
July 7, 1981
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Nikola Tesla Born Today
July 9, 1856 | 
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European Aeronautic Defence and Space (EADS)
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July 10, 2000
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Ernõ Rubik was Born Today
July 13, 1944 | 
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Pavel Cherenkov was Born
July 15, 1904
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The Day of Trinity
July 16, 1945
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Intel Incorporated Today
July 18, 1968 | 
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Apollo 11 Landed on the Moon!
July 20, 1969
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Friedrich Wilhelm Bessel Born Today
July 22, 1784 | 
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Happy Birthday Walter Schottky!
July 23, 1886
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NASA Created by an Act of Congress
July 29, 1958 | 
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Happy Birthday Vladimir Kosma Zworykin!
July 30, 1889
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| TEXT LINKS | | RF Cafe | | RF Cafe - Extensive resource for science and engineering. | | RF Cafe - An extensive resource for RF, wireless, and all aspects of science and engineering. | | RF Cafe - RF Cafe is a unique portal of RF, microwave, wireless, and other engineering resources. Vast collection of equations, references and conversions for electrical, mechanical, physical, and mathematical fields. Links for vendors, app notes, test notes, ham radio, magazines, books, active forums, patent and communications standards, technical crossword puzzles, quizzes, and much more. | | RF Cafe - RF Cafe is a unique portal for RF and microwave engineering resources. There you will find a vast collection of original content with definitions, equations, references and conversions that cover electrical, mechanical, physical, chemical and mathematical fields. Many interactive calculators are available for everything from filters to voltage dividers. In addition, you will find extensive links to other websites for vendor parts, application notes, test notes, amateur radio information, technical magazines and books, patent and communications standards, and much more. What makes RF Cafe so attractive is the daily headlines, the daily historical events list, and even technology-themed crossword puzzles that you will find nowhere else. The Factoids are always an interesting read, no matter what the subject (always relevant), and some of the Notable Quotes are hilarious. There is always a plethora of new material added, and is highlighted in the Recent Additions list. Even occasional humor items are thrown in to add some levity to the workday. For the job seeker or the employer seeking applicants, the RF Cafe Job Board provides a very focused, popular and professional venue for posting and searching resumes. Kirt Blattenberger is a degreed RF engineer who runs RF Cafe with a degree of passion not apparent in the other top “professional” websites. Many people have been surprised to learn that RF Cafe is not maintained with a full staff of editors and web designers, but it is not. | August | 
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U.S. Coast Guard was Established
August 4, 1790
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Happy Birthday Neil Armstrong!
August 5, 1930
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Paul Dirac (Dirac Delta Function) Was Born
August 8, 1902
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The IBM PC Was Introduced to the World
August 12, 1981
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Happy Birthday Anders Ångström!
August 13, 1814
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National Code Talker's Day
August 14 |
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V-J Day (Victory Over Japan)
August 14, 1945
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Happy Birthday Brook Taylor!
August 18, 1685
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Happy Birthday Philo T. Farnsworth!
August 19, 1906
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Gossamer Condor Wins Kremer Prize
August 23, 1977
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Happy Birthday Lee De Forest!
August 26, 1873
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Happy Birthday Ernest Rutherford!
August 30, 1871
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Happy Birthday Hermann Von Helmholtz!
August 31, 1821
| September | 
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Pioneer 11 Reaches Saturn
September 1, 1979
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Happy Birthday Hiram Percy Maxim!
September 2, 1869
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Happy Birthday John Dalton!
September 6, 1803
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Happy Birthday David Packard!
September 7, 1912
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Star Trek Debuted on NBC!
September 8, 1966
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1st Computer Bug Discovered!
September 9, 1945
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9-11 Heroes Medal of Valor
September 11, 2001 | 
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Jack Kilby Builds World's 1st IC
September 12, 1958
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Charles de Cisternay DuFay Born Today
September 14, 1698
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RCA Introduces the 12AX7 Tube
September 15, 1947
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Billy Durant Incorporated General Motors
September 16, 1908
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Space Shuttle Enterprise Debuts
September 17, 1976
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The U.S. Army Army Force became
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September 18, 1947
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1st Smiley Face Appeared on a Bulletin Board
September 19, 1982
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World's 1st Radio Newscast at KDKA
September 20, 1921
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Autumnal Equinox (1st day of Autumn/Fall) | 
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Robert Bosch Born Today
September 23, 1861
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USS Enterprise - World's 1st Nuclear-Powered Aircraft Carrier Launched
September 24, 1960
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Collins Radio Company Incorporated
September 25, 1933
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Happy Birthday Enrico Fermi!
September 29, 1901
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Johannes (Hans) Wilhelm Geiger Born Today
September 30, 1882
| October | 
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1st Ford Model T Built
October 1, 1908
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Happy Birthday Peanuts!
October 2, 1950 | 
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Transistor Patented by
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October 3, 1950
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Sputnik Launched - The Space Age Begins.
October 4, 1957 | 
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Happy Birthday Robert Goddard!
October 5, 1882
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George Westinghouse Born Today
October 6, 1846
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Neils Bohr Born Today
October 7, 1885
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U.S. Naval Academy Opened
October 10, 1845
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Columbus Day
2nd Monday in October
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Chuck Yeager Breaks the Sound Barrier
October 14, 1947
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Buon Compleanno, Evangelista Torricelli!
October 15, 1608
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Radio Corporation of America Established
October 17, 1919
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British Broadcasting Company Formed.
October 18, 1922
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Alfred Nobel Born
October 21, 1833
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Princeton (College of NJ) Received Its Charter
October 22, 1746
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Mole Day - 6:02 am to 6:02 pm on 10/23
October 23
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Maiden flight of the P-51 Mustang
October 26, 1940
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KDKA Assigned Its Call Letters.
October 27, 1940
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Statue of Liberty (a gift from France) Was Dedicated
October 28, 1886
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1st Message Sent via the ARPANET
October 29, 1969
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"The War of the Worlds" was broadcast.
October 30, 1938
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Narinder Singh Kapany Born
"Father of Fiber Optics"
October 31, 1927
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Daylight Saving Time
Begins 2nd Sunday in March
Ends 1st Sunday in November | 
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Spruce Goose's 1st and only flight
November 2, 1947
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Happy Birthday Daniel Rutherford!
November 3, 1749
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1st engineering college in U.S. - Rensselaer (RPI)
November 5, 1824
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Happy Birthday Marie Curie!
November 7, 1867
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Happy Birthday Edmond Halley!
November 8, 1656
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Happy Birthday Carl Sagan!
November 9, 1934
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United States Marine Corps Established
November 10, 1775
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Veteran's Day - Honoring All Who Served
November 11
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Happy Birthday Leo Baekeland
November 14, 1863 | 
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Intel Introduced the 4004 Microprocessor
November 15, 1971 | 
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SETI's Arecibo Message Sent
November 16, 1974 | 
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Alles Gute zum Geburtstag August Möbius
November 17, 1790 | 
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Happy Birthday Alan Shepard
November 18, 1923 | 
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Microsoft Windows 1.0 Released
November 20, 1985 | 
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1st Manned Hot Air Balloon Flight
November 21, 1783 | 
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B2 Stealth Bomber Unveiled
November 22, 1988 | 
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John Wallis - Mr. Infinity - born today
November 23, 1616 | 
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First Ad Appeared for a Wireless Telegraph Set
November 25, 1905 | 
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Happy Thanksgiving
4th Thursday in November | 
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Hanukkah
25th day of Kislev (late November to December) | December | 
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Happy Birthday Martin Heinrich Klaproth
December 1, 1743 | 
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1st Sustained Fission Reaction at Univ. of Chicago
December 2, 1942 | 
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Happy Birthday John Backus!
December 3, 1924 | 
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Happy Birthday Clyde Vernon Cessna!
December 5, 1879 | 
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Pearl Harbor Day
December 7, 1941 | 
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Coaxial Cable Patent Day
December 8, 1931
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Happy Birthday Grace Hopper!
December 9, 1906
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Happy Birthday Carl Gustav Jacob Jacobi!
December 10, 1804
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Happy Birthday Sir David Brewster!
December 11, 1781
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Marconi sent 1st transatlantic radio message
dit, dit, dit (•••, the letter "s")
December 12, 1901
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Happy Birthday Ernst Werner von Siemens
December 13, 1816
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Happy Birthday Tycho Brahe!
December 14, 1546 | 
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Happy Birthday Gustav Eiffel!
December 15, 1832 | 
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Battle of the Bulge
December 16, 1944 | 
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Anniversary of Powered Flight
December 17, 1903 | 
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Happy Birthday Edwin Armstrong!
Born December 18, 1890
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SCORE Satellite Launched
December 19, 1958
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Robert Van de Graaff
Born December 20, 1901
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Winter Solstice (1st day of winter) | 
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SR-71 Blackbird Maiden Flight
December 21, 1964 | 
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1st Manned Orbit of the Moon by Apollo 8
December 23, 1968 | 
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Happy Birthday James Joule!
Born December 24, 1818 | 
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Merry Christmas! Joyeux Noël!
Frohe Weihnachten! Buon Natale! Feliz Navidad!
веселое рождество! Καλά Χριστούγεννα!
メリークリスマス! 圣诞快乐! عيد ميلاد سعيد!
December 25 | 
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Happy Birthday Charles Babbage!
Born December 26, 1791 | 
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Happy Birthday Johannes Kepler!
Born December 27, 1571 | 
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Admiral Sold the 1st Color Television Set
Born December 30, 1953 | 
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Last Calvin and Hobbes comic strip...
Please come back!
December 31, 1995
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