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| Suggestions for Reciprocal Links to RF Cafe (& daily logos) | 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 when possible, and are in no way meant to imply any affiliation between RF Cafe and the entity being referenced. 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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We Know Your World | 
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We Filter Out the Noise Logo | 
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National Engineer's Week
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National Engineer's Week
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New Year's Day
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Happy Birthday Isaac Asimov!
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World's First Electric Watch Sold
January 3, 1957 | 
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Sir Isaac Newton's Birthday
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Marconi Established 1st Distress Signal
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Happy Birthday Robert Wilson!
January 10, 1936 | 
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George Pierce Born Today
January 11, 1872 | 
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Emergency 911 Phone Number Adopted
January 12, 1968 | 
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Lee de Forest Receives Patent for Triode Tube
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1st Ever Docking by Soyuz 4 & 5
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Happy Birthday Benjamin Franklin!
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Ray Dolby's Birthday
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James Watt's Birthday
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Edwin "Buzz" Aldrin's Birthday
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André-Marie Ampčre's Birthday
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Concord SST Went Into Service
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Uranium Atom 1st Split
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Apple Began Selling the Macintosh Computer
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AT&T Transcontinental Telephone Line Inaugurated
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Edison's Incandescent Bulb Patented
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Space Shuttle Challenger Explosion
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Explorer 1 Launched
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HP-35 Calculator Went on Sale
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Groundhog Day
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"The Day the Music Died"
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Super Bowl XLII
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Happy Birthday Charles A. Lindbergh
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Happy Birthday Harry Nyquist!
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Boy Scouts of America Founded
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The ENIAC Debut
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Happy Birthday Galileo Galilei!
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ASME Established
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Vanguard II - 1st Weather Satellite - Launched
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Ludwig Boltzmann's Birthday
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Happy Birthday Heinrich Hertz!
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Iwo Jima Flag Raising
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"His Master's Voice" Trademarked
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Sir Robert Watson-Watt Introduced RADAR
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Happy Birthday David Sarnoff!
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Happy Birthday Linus Pauling!
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Happy Birthday John Pell!
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Happy Birthday Dr. Seuss!
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Daylight Saving Time
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National Bureau of Standards (now NIST) Created
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Jules A. Lissajous' Birthday
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Maiden Flight of the Spitfire
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Joseph von Fraunhofer's Birthday
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Selma-to-Montgomery Freedom March
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Voyager Discovers Active Volcanoes on Io
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Alexander Bell Utters "Watson - come here..."
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1st Meeting of the Audio Engineering Society
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Gustav Kirchhoff's Birthday
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Sir William Herschel discovered Uranus
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International Pi (π) Day
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Beware the Ides of March
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Georg Simon Ohm's Birthday
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St. Patrick's Day
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Happy Birthday Rudolf Diesel!
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Swallows Return to San Juan Capistrano
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Einstein Publishes General Theory of Relativity
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Jean Baptiste Joseph Fourier's Birthday
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Robert Millikan's Birthday
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Happy Birthday Wernher von Braun
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Wilhelm Röntgen's Birthday
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1st Recorded Sighting of Halley's Comet
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Happy Birthday René Descartes!
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Happy Easter
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April Fool's Day
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World's First Cellphone Call Made
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Orwell's 1984... Day 1
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Alles Gute zum Geburtstag, Herr Fokker!
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James Smith McDonnell's Birthday
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U.S. Patent Systems Began
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1st Flight of the Space Shuttle - Columbia
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Harriet Quimby Crosses the English Channel Solo
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Ford Introduced the Mustang
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Paul Revere's Midnight Ride
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Happy Birthday, Melanie!
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Happy Birthday Jean-Baptiste Biot (Biot-Savart Law)
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Happy Birthday Robert Oppenheimer!
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Happy Birthday Max Planck!
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Edison General Electric Company Founded
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Happy Birthday Guglielmo Marconi
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Charles Richter Birthday
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Samuel Morse's Birthday
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"Philosophiae Naturalis Principia Mathematica" Published
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Happy Birthday Philip H. Smith
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Happy Birthday Johann Carl Friedrich Gauss
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Ford Adopted 40-Hour Work Week
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1st Trans-Atlantic TV Broadcast by Early Bird Satellite
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Alan Shepard became 1st American in Space
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Hindenburg Disaster
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V-E Day (Victory in Europe)
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1st Time a Laser Beam Was Bounced off the Moon
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1st Public Demo of VisiCalc
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NORAD Was Established
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Happy Birthday Joseph Henry!
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Happy Birthday Gabriel Daniel Fahrenheit
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Mother's Day
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Peace Officers Memorial Day
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Happy Birthday Johns Hopkins
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Happy Birthday William "Bill" Hewlett
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Charles Lindbergh Lands in Paris
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John Bardeen Born
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Happy Birthday William Gilbert!
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Happy Birthday Sally Ride!
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1st Transatlantic Flight
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Memorial Day - Remember Our Fallen Servicemen!
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Robert Morris Page Born
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Edwin White 1st American to Walk in Space
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Happy Birthday Maurice Paul Auguste Charles Fabry!
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Baseball Hall of Fame Dedication
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Happy Birthday James Clerk Maxwell!
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Flag Day
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Happy Birthday Charles-Augustin de Coulomb!
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Radio Bloemendaal Becomes
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1st Model A Ford Produced
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Statue of Liberty Arrived in NY
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Happy Father's Day
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Dr. Sally Became 1st U.S. Woman in Space
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Happy Birthday Blaise Pascal!
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U.S. Army Air Force Established
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Summer Solstice (1st day of summer)
2009 June 21 05:45 UTC
2010 June 21 11:28 UTC
2011 June 21 17:16 UTC
2012 June 20 23:09 UTC
2013 June 21 05:04 UTC
2014 June 21 10:51 UTC
2015 June 21 16:38 UTC | 
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Siméon-Denis Poisson Born
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Greenwich Royal Observatory Established
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Happy Birthday Wilhelm Cauer!
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1st Color TV Broadcast
June 25, 1951 | 
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Lord Kelvin Born Today
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Augustus De Morgan Born
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Treaty of Versailles Signed
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George Ellery Hale Born Today
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Mysterious Explosion over Tunguska, Siberia
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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.
| | July | 
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Canada Day
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Happy Birthday William Bragg!
July 2, 1862 | 
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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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Happy Birthday William John Macquorn Rankine!
July 5, 1820 | 
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Solar Challenger Crosses the English Channel
July 7, 1981 | 
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UFOs 1st Reported over Roswell, NM
July 8, 1947 | 
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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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1st Transatlantic TV Signal Transmitted via Telstar
July 11, 1962 | 
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Happy Birthday Buckminster Fuller!
July 12, 1895 | 
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Ernő Rubik was Born Today
July 13, 1944 | 
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Sarah E. Goode 1st Black Woman Awarded Patent
July 14, 1885 | 
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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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Apollo-Soyuz Rondezvous
July 17, 1975 | 
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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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Happy Birthday Amelia Earhart!
July 24, 1897 | 
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1st Geosynchronous Satellite - Syncom 2
July 26, 1963 | 
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Trans-Alaska Pipeline Loaded 1st Oil onto Tanker
July 28, 1977 | 
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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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Samuel Hopkins Awarded 1st U.S. Patent
July 31, 1790 | | August | 
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1st Official Metre Defined
August 1, 1793 | 
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Happy Birthday Elisha Gray!
August 2, 1835 | 
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Radio Shack's TRS-80 Computer Announced
August 3, 1977 | 
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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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Tim Berners-Lee Published the 1st WWW Site
August 6, 1991 | 
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Guadalcanal Campaign Launched
August 7, 1942 | 
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Paul Dirac (Dirac Delta Function) Was Born
August 8, 1902 | 
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Happy Birthday Amedeo Avogadro!
August 9, 1776 | 
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Happy Birthday Leo Fender!
August 10, 1981 | 
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The IBM PC Was Introduced to the World
August 12, 1981 | 
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Happy Birthday Anders Ĺngström!
August 13, 1814 | 
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National Code Talker's Day
August 14 | 
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Sony Released Its 1st Music CD-ROM
August 17, 1982 | 
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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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Hawaii Became the 50th State
August 21, 1958 | 
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1st Victrola Went on Sale
August 22, 1906 | 
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Gossamer Condor Wins Kremer Prize
August 23, 1977 | 
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France Detonated Its 1st Thermonuclear Bomb
August 24, 1968 | 
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Happy Birthday Joshua Lionel Cowen!
August 25, 1880 | 
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Happy Birthday Lee De Forest!
August 26, 1873 | 
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1st Edition of Scientific American Published
August 28, 1845 | 
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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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1st Color Photos of Mars Taken by Viking Lander 2
September 3, 1976 | 
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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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Happy Birthday Arthur Compton!
September 10, 1892 | 
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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
the U.S. Air Force
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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50 x 150 pixel graphic (2.69 kB)
Autumnal Equinox (1st day of Autumn/Fall) | 
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TI Introduced the DATAMATH Series of Calculators
September 22, 1972 | 
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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 Seymour Cray!
September 28, 1925 | 
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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
Shockley, Bardeen and Brattain
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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Erie Canal Inaugurated
October 8, 1823 | 
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U.S. Naval Academy Opened
October 10, 1845 | 
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Kathryn Sullivan Became 1st U.S. Woman Spacewalker
October 11, 1984 | 
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Columbus Day
2nd Monday in October | 
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1st Cellular Service Launched
October 13, 1983 | 
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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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1st Commercial Wind Power at Grandpa's Knob, VT
October 19, 1941 | 
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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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Bulova Accutron 214 Introduced - 1st Electronic Watch
October 25, 1960 | 
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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 | | November |
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Daylight Saving Time
Begins 2nd Sunday in March
Ends 1st Sunday in November | 
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1st Hydrogen Bomb Detonated
November 1, 1952 | 
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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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Happy Birthday Benjamin F. Goodrich!
November 4, 1841 | 
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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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Happy Birthday Eileen Collins!
November 21, 1956 | 
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Microsoft Windows 1.0 Released
November 20, 1985 | 
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1st Untethered 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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Happy Birthday Konosuke Matsushita!
November 27, 1894 | 
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Happy Birthday Christian Doppler!
November 29, 1803 | 
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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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World's 1st Transistor Invented
December 16, 1947
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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 22, 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 Clemens Winkler!
December 26, 1838 | 
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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
December 31, 1995 |
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