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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

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Job Board

About RF Cafe©

RF Cafe E-Mail

Suggestions for Reciprocal Links to RF Cafe
& All of the Day in History Commemorative RF Cafe 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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Retro Logo



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We Know Your World


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Smith Chart Logo



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We Filter Out the Noise Logo
Please click here to visit the RF Cafe Job Board
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RF Cafe Jobs Board. Click here to return to the RF Cafe homepage.
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National Engineer's Week
February (variable)


RF Cafe Jobs Board. Click here to return to the RF Cafe homepage.
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National Engineer's Week
February (variable)
January
Happy New Year!!!  Please click here to visit RF Cafe.
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New Year's Day
January 1


Happy Birthday Isaac Asimov!  Please click here to visit RF Cafe.
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Happy Birthday Isaac Asimov!
January
2, 1920

World's First Electric Watch Sold.  Please click here to visit RF Cafe.
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World's First Electric Watch Sold
January
3, 1957

Sir Isaac Newton's Birthday.  Please click here to visit RF Cafe.
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Sir Isaac Newton's Birthday
January
4, 1643

Marconi Established 1st Distress Signal.  Please click here to visit RF Cafe.
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Marconi Established 1st Distress Signal
January
7, 1904

Happy Birthday Robert Wilson!  Please click here to visit RF Cafe.
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Happy Birthday Robert Wilson!
January 10, 1936


George Pierce Born Today.  Please click here to visit RF Cafe.
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George Pierce Born Today
January 11, 1872


Emergency 911 Phone Number Adopted.  Please click here to visit RF Cafe.
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Emergency 911 Phone Number Adopted
January 12, 1968


Lee de Forest Receives Patent for Triode Tube.  Please click here to visit RF Cafe.
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Lee de Forest Receives Patent for Triode Tube
January 15, 1907


1st Ever Docking by Soyuz 4 & 5 - Please click here to visit RF Cafe.
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1st Ever Docking by Soyuz 4 & 5
January 16, 1969


Happy Birthday Benjamin Franklin! - Please click here to visit RF Cafe.
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Happy Birthday Benjamin Franklin!
January 17, 1706


Ray Dolby's Birthday! - Please click here to visit RF Cafe.
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Ray Dolby's Birthday
January 18, 1933


James Watt's birthday - Please click here to visit RF Cafe.
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James Watt's Birthday
January 19, 1736


Buzz Aldrin birthday - Please click here to visit RF Cafe.
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Edwin "Buzz" Aldrin's Birthday
January 20, 1930


André-Marie Ampère birthday - Please click here to visit RF Cafe.
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André-Marie Ampère's Birthday
January 20, 1775


Concord SST Went Into Service - Please click here to visit RF Cafe.
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Concord SST Went Into Service
January 21, 1976


Uranium Atom 1st Split - Please click here to visit RF Cafe.
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Uranium Atom 1st Split
January 22, 1939


Apple Began Selling the Macintosh Computer - Please click here to visit RF Cafe.
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Apple Began Selling the Macintosh Computer
January 24, 1984


AT&T Transcontinental Telephone Line Inaugurated - Please click here to visit RF Cafe.
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AT&T Transcontinental Telephone Line Inaugurated
January 25, 1915


Edison's Incandescent Bulb Patented - Please click here to visit RF Cafe.
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Edison's Incandescent Bulb Patented
January 27, 1880


Space Shuttle Challenger Exploded - Please click here to visit RF Cafe.
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Space Shuttle Challenger Explosion
January 28, 1986


Explorer 1 Launched - Please click here to visit RF Cafe.
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Explorer 1 Launched
January 31, 1958
February
HP-35 Calculator Went on Sale - Please click here to visit RF Cafe.
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HP-35 Calculator Went on Sale
February
1, 1972

Groundhog Day - Please click here to visit RF Cafe.
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Groundhog Day
February 2


"The Day the Music Died" - Please click here to visit RF Cafe.
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"The Day the Music Died"
February 3,
1959

Super Bowl XLII - Please click here to visit RF Cafe.
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Super Bowl XLII
February 3, 2008


Happy Birthday Charles A. Lindbergh - Please click here to visit RF Cafe.
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Happy Birthday Charles A. Lindbergh
February 4, 18902


Happy Birthday Charles Wheatstone - Please click here to visit RF Cafe.
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Happy Birthday Charles Wheatstone
February 6, 1802


Happy Birthday Harry Nyquist! - Please click here to visit RF Cafe.
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Happy Birthday Harry Nyquist!
February 7, 1889


Boy Scouts of America Founded  - Please click here to visit RF Cafe.
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Boy Scouts of America Founded
February 8, 1910


Walter H. Brattain's Birthday - Please click here to visit RF Cafe.
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Walter H. Brattain's Birthday
February 10, 1902


Thomas Alva Edison's Birthday - Please click here to visit RF Cafe.
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Thomas Alva Edison's Birthday
February 11, 1847


Heinrich Lenz's Birthday - Please click here to visit RF Cafe.
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Heinrich Lenz's Birthday
February 12, 1804


ENIAC Debut - Please click here to visit RF Cafe.
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The ENIAC Debut
February 13, 1946


Happy Valentine's Day!  Please click here to visit RF Cafe.
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Valentine's Day
February 14


Happy Birthday Galileo Galilei!  Please click here to visit RF Cafe.
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Happy Birthday Galileo Galilei!
February 15, 1584


ASME Established.  Please click here to visit RF Cafe.
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ASME Established
February 16, 1880


Engineer's Week. Click here to return to the RF Cafe homepage.
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National Engineer's Week 2007
February 18, 2007


Vanguard II - 1st Weather Satellite - Launched.  Please click here to visit RF Cafe.
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Vanguard II - 1st Weather Satellite - Launched
February 17, 1959


Happy Birthday Alessandro Volta!  Please click here to visit RF Cafe.
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Happy Birthday Alessandro Volta!
February 18, 1745


Svante Arrhenius' Birthday - Please click here to visit RF Cafe.
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Svante Arrhenius' Birthday
February 19, 1859


Engineers Week 2008. Click here to return to the RF Cafe homepage.
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National Engineer's Week 2008
February 19, 2008


Ludwig Boltzmann's Birthday - Please click here to visit RF Cafe.
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Ludwig Boltzmann's Birthday
February 20, 1844


Happy Birthday Heinrich Hertz! Click here to return to the RF Cafe homepage.
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Happy Birthday Heinrich Hertz!
February 22, 1857


Iwo Jima Flag Raising. Click here to return to the RF Cafe homepage.
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Iwo Jima Flag Raising
February 23, 1945


"His Master's Voice" trademarked. Click here to return to the RF Cafe homepage.
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"His Master's Voice" Trademarked
February 24, 1925


Sir Robert Watson-Watt Introduced RADAR - Please click here to visit RF Cafe.
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Sir Robert Watson-Watt Introduced RADAR
February 26, 1935


Happy Birthday David Sarnoff! - Please click here to visit RF Cafe.
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Happy Birthday David Sarnoff!
Born February 27, 1891


Happy Birthday Linus Pauling! - Please click here to visit RF Cafe.
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Happy Birthday Linus Pauling!
Born February 28, 1901
March
Happy Birthday John Pell! - Please click here to visit RF Cafe.
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Happy Birthday John Pell!
Born March 1, 1611


Happy Birthday Dr. Seuss! - Please click here to visit RF Cafe.
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Happy Birthday Dr. Seuss!
Born March 2, 1904


Don't forget to reset you clock for Daylight Saving Time.  Please click here to visit RF Cafe
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Daylight Saving Time
Begins 2nd Sunday in March
Ends 1st Sunday in November


National Bureau of Standards (now NIST) Created - Please click here to visit RF Cafe.
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National Bureau of Standards (now NIST) Created
March 3, 1901


Jules Lissajous born. Click here to return to the RF Cafe homepage.
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Jules A. Lissajous' Birthday
March 4, 1822


Maiden Flight of the Spitfire. Click here to return to the RF Cafe homepage.
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Maiden Flight of the Spitfire
March 5, 1936


Joseph von Fraunhofer's Birthday - Please click here to visit RF Cafe.
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Joseph von Fraunhofer's Birthday
March 6, 1787


Selma to Montgomery march for equality.  Please click here to visit RF Cafe.
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Selma-to-Montgomery Freedom March
March 7, 1965


Voyager Discovers Active Volcanoes on Io.  Please click here to visit RF Cafe.
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Voyager Discovers Active Volcanoes on Io
March 8, 1979


Alexander Bell Utters "Watson - come here..."  Please click here to visit RF Cafe.
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Alexander Bell Utters "Watson - come here..."
March 10, 1876


1st Meeting of the Audio Engineering Society.  Please click here to visit RF Cafe.
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1st Meeting of the Audio Engineering Society
March 11, 1948


Gustav Kirchhoff born. Click here to return to the RF Cafe homepage.
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Gustav Kirchhoff's Birthday
March 12, 1824


Sir William Herschel discovered Uranus. Click here to return to the RF Cafe homepage.
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Sir William Herschel discovered Uranus
March 13, 1781


Pi Day. Click here to return to the RF Cafe homepage.
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International Pi (π) Day
March 14 (at 1:59:26 o'clock - 3.1415926)


1st .com Web Address Assigned. Click here to return to the RF Cafe homepage.

Beware the Ides of March. Click here to return to the RF Cafe homepage.
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Beware the Ides of March
March 15


Georg Simon Ohm's Birthday - Please click here to visit RF Cafe.
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Georg Simon Ohm's Birthday
March 16, 1789


Happy St. Patrick's Day!!! Please click here to visit RF Cafe.
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St. Patrick's Day
March 17


Happy Birthday Rudolf Diesel! Please click here to visit RF Cafe.
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Happy Birthday Rudolf Diesel!
March 1
8, 1858

The swallows return to San Juan Capistrano.  Please click here to visit RF Cafe.
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Swallows Return to San Juan Capistrano
March 19


Einstein Publishes General Theory of Relativity.  Please click here to visit RF Cafe.
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Einstein Publishes General Theory of Relativity
March
20, 1916

Vernal Equinox.  Please click here to visit RF Cafe
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Vernal Equinox (1st day of spring)


Jean Baptiste Joseph Fourier born. Click here to return to the RF Cafe homepage.
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Jean Baptiste Joseph Fourier's Birthday
March 21, 1768


Robert Millikan's Birthday. Click here to return to the RF Cafe homepage.
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Robert Millikan's Birthday
March 22, 1868


Happy Birthday Wernher von Braun! Click here to return to the RF Cafe homepage.
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Happy Birthday Wernher von Braun
March 23, 1912


Happy Birthday Fleeming Jenkin! Click here to return to the RF Cafe homepage.
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Happy Birthday Fleeming Jenkin
March 25, 1833


Wilhelm Röntgen's Birthday - Please click here to visit RF Cafe.
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Wilhelm Röntgen's Birthday
March 27, 1845


1st Recorded Sighting of Halley's Comet - Please click here to visit RF Cafe.
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1st Recorded Sighting of Halley's Comet
March 30, 239 BC


Happy Birthday René Descartes! - Please click here to visit RF Cafe.
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Happy Birthday René Descartes!
March 31, 1596


Happy Easter!  Please click here to visit RF Cafe.
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Happy Easter
March-April (variable)
April
April Fool's Day. Click here to return to the RF Cafe homepage.
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April Fool's Day
April 1


2001: A space Odyssey Premiered.  Click here to return to the RF Cafe homepage.
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2001: A space Odyssey Premiered
April 2, 1968


World's first cellphone call placed. Click here to return to the RF Cafe homepage.
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World's First Cellphone Call Made
on a Motorola DynaTAC
April 3, 1973


Orwell's 1984... Day 1 - Please click here to visit RF Cafe.
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Orwell's 1984... Day 1
April 4, 1984


Alles Gute zum Geburtstag, Herr Fokker! - Please click here to visit RF Cafe.
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Alles Gute zum Geburtstag, Herr Fokker!
April 6, 1890


Heike Onnes Discovered Superconductivity - Please click here to visit RF Cafe.
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Heike Onnes Discovered Superconductivity
April 8, 1911


James McDonnell's Birthday - Please click here to visit RF Cafe.
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James Smith McDonnell's Birthday
April 9, 1899


U.S. Patent Systems Began - Please click here to visit RF Cafe.
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U.S. Patent Systems Began
April 10, 1790


1st Flight of the Space Shuttle.  Please click here to visit RF Cafe.
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1st Flight of the Space Shuttle - Columbia
April 12, 1981


Sir Robert Watson-Watt, "Father of Radar," Born.  Please click here to visit RF Cafe.
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Sir Robert Watson-Watt, "Father of Radar," Born.
April 13, 1892


The Sinking of the RMS Titanic.  Please click here to visit RF Cafe.
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The Sinking of the RMS Titanic
April 14, 1912


The Tax Man Cometh!  Please click here to visit RF Cafe.
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Tax Day in the U.S.A.
April 15


Harriet Quimby Crosses the English Channel Solo - Please click here to visit RF Cafe.
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Harriet Quimby Crosses the English Channel Solo
April 16, 1912


Ford Introduced the Mustang - Please click here to visit RF Cafe.
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Ford Introduced the Mustang
April 17, 1964


Paul Revere's Midnight Ride - Please click here to visit RF Cafe.
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Paul Revere's Midnight Ride
April 18, 1775


Happy Birthday, Melanie! - Please click here to visit RF Cafe.
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Happy Birthday, Melanie!
April 19, 19-something


Happy Birthday to Jean-Baptiste Biot (Biot-Savart Law)!  Please click here to visit RF Cafe.
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Happy Birthday Jean-Baptiste Biot (Biot-Savart Law)
April 21, 1774


Happy Birthday Robert Oppenheimer! - Please click here to visit RF Cafe.
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Happy Birthday Robert Oppenheimer!
April 22, 1904


Happy Birthday Max Planck! - Please click here to visit RF Cafe.
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Happy Birthday Max Planck!
April 23, 1858


Edison General Electric Company Founded - Please click here to visit RF Cafe.
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Edison General Electric Company Founded
April 24, 1889


Happy Birthday to Guglielmo Marconi!  Please click here to visit RF Cafe.
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Happy Birthday Guglielmo Marconi
April 25, 1874


Happy Birthday Charles Richter! Click here to return to the RF Cafe homepage.
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Charles Richter Birthday
April 26, 1900


Happy Birthday Samuel Morse! Click here to return to the RF Cafe homepage.
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Samuel Morse's Birthday
April 27, 1791


"Philosophiae Naturalis Principia Mathematica" -  Please click here to visit RF Cafe.
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"Philosophiae Naturalis Principia Mathematica" Published
April 28, 1686


Happy Birthday Philip H. Smith! -  Please click here to visit RF Cafe.
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Happy Birthday Philip H. Smith
April 29, 1905


Happy Birthday to Happy Birthday Johann Carl Friedrich Gauss!  Please click here to visit RF Cafe.
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Happy Birthday Johann Carl Friedrich Gauss
April 30, 1777
May
Ford Adopted 40-Hour Work Week. Click here to return to the RF Cafe homepage.
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Ford Adopted 40-Hour Work Week
May 1, 1926


1st Trans-Atlantic TV Broadcast by Early Bird Satellite. Click here to return to the RF Cafe homepage.
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 1st Trans-Atlantic TV Broadcast by Early Bird Satellite
May 2, 1965


Alan Shepard became 1st American in Space. Click here to return to the RF Cafe homepage.
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Alan Shepard became 1st American in Space
May 5, 1961


Hindenburg Disaster. Click here to return to the RF Cafe homepage.
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Hindenburg Disaster
May 6, 1937


V-E Day. Click here to return to the RF Cafe homepage.
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V-E Day (Victory in Europe)
May 8, 1945


1st Time a Laser Beam Was Bounced off the Moon. Click here to return to the RF Cafe homepage.
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1st Time a Laser Beam Was Bounced off the Moon
May 9, 1962


1st Public Demo of VisiCalc. Click here to return to the RF Cafe homepage.
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1st Public Demo of VisiCalc
May 11, 1979


NORAD Was Established. Please click here to visit RF Cafe.
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NORAD Was Established
May 12, 1958


Happy Birthday Joseph Henry! Please click here to visit RF Cafe.
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Happy Birthday Joseph Henry!
May 13, 1878


Happy Birthday to Gabriel Daniel Fahrenheit!  Please click here to visit RF Cafe.
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Happy Birthday Gabriel Daniel Fahrenheit
May 14, 1687


Happy Mother's Day! Click here to return to the RF Cafe homepage.
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Mother's Day
2nd Sunday in May


Peace Officers Memorial Day - Please click here to visit RF Cafe.
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Peace Officers Memorial Day
May 15


Happy Birthday to Oliver Heaviside!  Please click here to visit RF Cafe.
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Happy Birthday Oliver Heaviside
May 18, 1850


Happy Birthday to Johns Hopkins!  Please click here to visit RF Cafe.
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Happy Birthday Johns Hopkins
May 19, 1795


Happy Birthday to William "Bill" Hewlett!  Please click here to visit RF Cafe.
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Happy Birthday William "Bill" Hewlett
May 20, 1913


Charles Lindbergh Lands in Paris.  Please click here to visit RF Cafe.
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Charles Lindbergh Lands in Paris
May 21, 1927


John Bardeen born on this date. - Please click here to visit RF Cafe.
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John Bardeen Born
May 23, 1908


Happy Birthday William Gilbert! - Please click here to visit RF Cafe.
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Happy Birthday William Gilbert!
May 24, 1544


Happy Birthday Sally Ride! - Please click here to visit RF Cafe.
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Happy Birthday Sally Ride!
May 26, 1951


1st Transatlantic Flight - Please click here to visit RF Cafe.
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1st Transatlantic Flight
May 27, 1919


Rockwell's Rosie the Riveter on TIME Cover - Please click here to visit RF Cafe.
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Rockwell's Rosie the Riveter
on Saturday Evening Post Cover
May 29, 1943


U.S. Copyright Law Passed - Please click here to visit RF Cafe.
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U.S. Copyright Law Passed
May 31, 1790


Memorial Day - Remember Our Fallen Servicemen!  Please click here to visit RF Cafe.
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Memorial Day - Remember Our Fallen Servicemen!
Last Monday in May
June
Happy Birthday Nicholas Léonard Sadi Carnot! - Please click here to visit RF Cafe.
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Happy Birthday Nicholas Léonard Sadi Carnot!
June 1, 1796


Robert Morris Page born on this date. - Please click here to visit RF Cafe.
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Robert Morris Page Born
June 2, 1903


Edwin White 1st American to Walk in Space.  Please click here to visit RF Cafe.
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Edwin White 1st American to Walk in Space
June 3, 1965


1st Public Hot Air Balloon Flight.  Please click here to visit RF Cafe.
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1st Public Hot Air Balloon Flight
June 4, 1783


D-Day. Click here to return to the RF Cafe homepage.
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D-Day
June 6, 1944


Jacques-Arsène d' Arsonval born on this date. - Please click here to visit RF Cafe.
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Jacques-Arsène d' Arsonval Born
June 8, 1851


First time SOS distress signal was used. - Please click here to visit RF Cafe.
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First time SOS distress signal was used
June 10, 1909


Happy Birthday Charles Fabry! - Please click here to visit RF Cafe.
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Happy Birthday Maurice Paul Auguste Charles Fabry!
June 11, 1867


Baseball Hall of Fame Dedication - Please click here to visit RF Cafe.
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Baseball Hall of Fame Dedication
June 12, 1939


Happy Birthday James Clerk Maxwell! - Please click here to visit RF Cafe.
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Happy Birthday James Clerk Maxwell!
June 13, 1
831 Flag Day. Click here to return to the RF Cafe homepage.
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Flag Day
June 14


Happy Birthday Charles-Augustin de Coulomb! - Please click here to visit RF Cafe.
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Happy Birthday Charles-Augustin de Coulomb!
June 14, 1736


Radio Bloemendaal Becomes The Netherland's 1st Radio Station - Please click here to visit RF Cafe.
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Radio Bloemendaal Becomes
The Netherland's 1st Radio Station
June 15, 1924


1st Model A Ford Produced - Please click here to visit RF Cafe.
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1st Model A Ford Produced
June 16, 1903


Statue of Liberty Arrived in NY - Please click here to visit RF Cafe.
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Statue of Liberty Arrived in NY
June 17, 1885


Happy Father's Day! Click here to return to the RF Cafe homepage.
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Happy Father's Day
3rd Sunday in June


Dr. Sally Became 1st U.S. Woman in Space - Please click here to visit RF Cafe.
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Dr. Sally Became 1st U.S. Woman in Space
June 18, 1983
Happy Birthday Blaise Pascal!  Please click here to visit RF Cafe.
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Happy Birthday Blaise Pascal!
June 19, 1623


U.S. Army Air Force Established - Please click here to visit RF Cafe.
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U.S. Army Air Force Established
June 20, 1935

Summer Solstice.  Please click here to visit RF Cafe

Summer Solstice.  Please click here to visit RF Cafe
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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


Happy Birthday to Siméon-Denis Poisson. - Please click here to visit RF Cafe.
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Siméon-Denis Poisson Born
June 21, 1781


Greenwich Royal Observatory Established - Please click here to visit RF Cafe.
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Greenwich Royal Observatory Established
June 22, 1675


Happy Birthday Wilhelm Cauer! - Please click here to visit RF Cafe.
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Happy Birthday Wilhelm Cauer!
June 24, 1900


1st Color TV Broadcast - Please click here to visit RF Cafe.
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1st Color TV Broadcast
June 25, 1951


Happy Birthday Lord Kelvin!  Please click here to visit RF Cafe.
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Lord Kelvin Born Today
June 26, 1824


Happy Birthday to Augustus De Morgan. - Please click here to visit RF Cafe.
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Augustus De Morgan Born
June 27, 1806


Treaty of Versailles. Click here to return to the RF Cafe homepage.
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Treaty of Versailles Signed
June 28, 1919


George Ellery Hale Born Today.  Please click here to visit RF Cafe.
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George Ellery Hale Born Today
June 29, 1868

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Mysterious Explosion over Tunguska, Siberia
June 30, 1908
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 Jobs page 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
Happy Canada Day! Click here to return to the RF Cafe homepage.
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Canada Day
July 1


Happy Birthday William Bragg! Click here to return to the RF Cafe homepage.
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Happy Birthday William Bragg!
July 2, 1862


The Dog Days of Summer. Click here to return to the RF Cafe homepage.
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The Dog Days of Summer Begin
July 3 to August 11


Happy 4th of July - Independence Day!  Please click here to visit RF Cafe.
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Independence Day
July 4, 1776


Happy Birthday William John Macquorn Rankine! - Please click here to visit RF Cafe.
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Happy Birthday William John Macquorn Rankine!
July 5, 1
820

Solar Challenger Crosses the English Channel. - Please click here to visit RF Cafe.
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Solar Challenger Crosses the English Channel
July 7, 1981


UFOs 1st Reported over Roswell, NM.  Please click here to visit RF Cafe.
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UFOs 1st Reported over Roswell, NM
July
8, 1947

Nikola Tesla Born Today.  Please click here to visit RF Cafe.
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Nikola Tesla Born Today
July 9, 1856


EADS was formed. - Please click here to visit RF Cafe.
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European Aeronautic Defence and Space (EADS)
was Formed
July 10, 2000


1st Translantic TV Signal Transmitted via Telstar.  Please click here to visit RF Cafe.
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1st Transatlantic TV Signal Transmitted via Telstar
July 11, 1962


Happy Birthday Buckminster Fuller! -  Please click here to visit RF Cafe.
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Happy Birthday Buckminster Fuller!
July 12, 1895


Ernõ Rubik Born Today.  Please click here to visit RF Cafe.
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Ernõ Rubik was Born Today
July 13, 1944


Sarah E. Goode 1st Black Woman Awarded Patent - Please click here to visit RF Cafe.
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Sarah E. Goode 1st Black Woman Awarded Patent
July 14, 1885


Pavel Cherenkov was born. - Please click here to visit RF Cafe.
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Pavel Cherenkov was Born
July 15, 1904


The Day of Trinity. Click here to return to the RF Cafe homepage.
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The Day of Trinity
July 16, 1945


Apollo-Soyuz Rondezvous.  Please click here to visit RF Cafe.
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Apollo-Soyuz Rondezvous
July 17, 1975


Intel Incorporated Today.  Please click here to visit RF Cafe.
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Intel Incorporated Today
July 18, 1968


Apollo 11 Landed on the Moon! - Please click here to visit RF Cafe.
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Apollo 11 Landed on the Moon!
July 20, 1969


Friedrich Wilhelm Bessel Born Today.  Please click here to visit RF Cafe.
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Friedrich Wilhelm Bessel Born Today
July 22, 1784


Happy Birthday Walter Schottky! - Please click here to visit RF Cafe.
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Happy Birthday Walter Schottky!
July 23, 1886


Happy Birthday Amelia Earhart!  Please click here to visit RF Cafe.
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Happy Birthday Amelia Earhart!
July 24, 1897


1st Geosynchronous Satellite - Syncom 2 - Please click here to visit RF Cafe.
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1st Geosynchronous Satellite - Syncom 2
July 26, 1963


Trans-Alaska Pipeline Loaded 1st Oil onto Tanker - Please click here to visit RF Cafe.
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Trans-Alaska Pipeline Loaded 1st Oil onto Tanker
July 28, 1977


NASA Created by an Act of Congress.  Please click here to visit RF Cafe.
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NASA Created by an Act of Congress
July 29, 1958


Happy Birthday Vladimir Zworykin! - Please click here to visit RF Cafe.
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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
1st Official Metre Defined - Please click here to visit RF Cafe.
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1st Official Metre Defined
August 1, 1793


Happy Birthday Elisha Gray! - Please click here to visit RF Cafe.
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Happy Birthday Elisha Gray!
August 2, 1835


Radio Shack's TRS-80 Computer Announced - Please click here to visit RF Cafe.
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Radio Shack's TRS-80 Computer Announced
August 3, 1977


U.S. Coast Guard was Established - Please click here to visit RF Cafe.
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U.S. Coast Guard was Established
August 4, 1790


Happy Birthday Neil Armstrong! - Please click here to visit RF Cafe.
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Happy Birthday Neil Armstrong!
August 5, 1930


1st WWW Site Published - Please click here to visit RF Cafe.
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Tim Berners-Lee Published the 1st WWW Site
August 6, 1991


Guadalcanal Campaign Launched - Please click here to visit RF Cafe.
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Guadalcanal Campaign Launched
August 7, 1942


Happy Birthday, Paul Dirac! - Please click here to visit RF Cafe.
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Paul Dirac (Dirac Delta Function) Was Born
August 8, 1902


Happy Birthday Amedeo Avogadro! - Please click here to visit RF Cafe.
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Happy Birthday Amedeo Avogadro!
August 9, 1776


Happy Birthday Leo Fender! - Please click here to visit RF Cafe.
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Happy Birthday Leo Fender!
August 10, 1981


The IBM PC Was Introduced to the World - Please click here to visit RF Cafe.
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The IBM PC Was Introduced to the World
August 12, 1981


Happy Birthday Anders Ångström! - Please click here to visit RF Cafe.
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Happy Birthday Anders Ångström!
August 13, 1814


The Code Talkers. Click here to return to the RF Cafe homepage.
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National Code Talker's Day
August 14


Sony Released Its 1st Music CD-ROM - Please click here to visit RF Cafe.
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Sony Released Its 1st Music CD-ROM
August 17, 1982


Happy Birthday Brook Taylor! - Please click here to visit RF Cafe.
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Happy Birthday Brook Taylor!
August 18, 1685


Happy Birthday Philo T. Farnsworth! - Please click here to visit RF Cafe.
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Happy Birthday Philo T. Farnsworth!
August 19, 1906


Hawaii Became the 50th State - Please click here to visit RF Cafe.
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Hawaii Became the 50th State
August 21, 1958


1st Victrola Went on Sale - Please click here to visit RF Cafe.
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1st Victrola Went on Sale
August 22, 1906


Gossamer Condor Wins Kremer Prize - Please click here to visit RF Cafe.
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Gossamer Condor Wins Kremer Prize
August 23, 1977


France Detonated Its 1st Thermonuclear Bomb - Please click here to visit RF Cafe.
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France Detonated Its 1st Thermonuclear Bomb
August 24, 1968


Happy Birthday Joshua Lionel Cowen! - Please click here to visit RF Cafe.
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Happy Birthday Joshua Lionel Cowen!
August 25, 1880


Happy Birthday Lee De Forest! - Please click here to visit RF Cafe.
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Happy Birthday Lee De Forest!
August 26, 1873


1st Edition of Scientific American Published - Please click here to visit RF Cafe.
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1st Edition of Scientific American Published
August 28, 1845


Happy Birthday Ernest Rutherford! - Please click here to visit RF Cafe.
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Happy Birthday Ernest Rutherford!
August 30, 1871


Happy Birthday Hermann Von Helmholtz! - Please click here to visit RF Cafe.
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Happy Birthday Hermann Von Helmholtz!
August 31, 1821
September
Pioneer 11 Reaches Saturn - Please click here to visit RF Cafe.
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Pioneer 11 Reaches Saturn
September 1, 1979


Happy Birthday Hiram Percy Maxim! - Please click here to visit RF Cafe.
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Happy Birthday Hiram Percy Maxim!
September 2, 1869


1st Color Photos of Mars Taken by Viking Lander 2 - Please click here to visit RF Cafe.
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1st Color Photos of Mars Taken by Viking Lander 2
September 3, 1976


Happy Birthday John Dalton! - Please click here to visit RF Cafe.
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Happy Birthday John Dalton!
September 6, 1803


Happy Birthday David Packard! - Please click here to visit RF Cafe.
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Happy Birthday David Packard!
September 7, 1912


Star Trek Debuted on NBC! - Please click here to visit RF Cafe.
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Star Trek Debuted on NBC!
September 8, 1966


1st Computer Bug Discovered! - Please click here to visit RF Cafe.
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1st Computer Bug Discovered!
September 9, 1945


Happy Birthday Arthur Compton! - Please click here to visit RF Cafe.
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Happy Birthday Arthur Compton!
September 10, 1892


9-11 Heroes Medal of Valor. Click here to return to the RF Cafe homepage.
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9-11 Heroes Medal of Valor
September 11, 2001


Jack Kilby Builds World's 1st IC - Please click here to visit RF Cafe.
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Jack Kilby Builds World's 1st IC
September 12, 1958



Charles de Cisternay DuFay Born Today - Please click here to visit RF Cafe.
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Charles de Cisternay DuFay Born Today
September 14, 1698


RCA Introduces the 12AX7 Tube - Please click here to visit RF Cafe.
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RCA Introduces the 12AX7 Tube
September 15, 1947


Billy Durant Incorporated General Motors - Please click here to visit RF Cafe.
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Billy Durant Incorporated General Motors
September 16, 1908


Space Shuttle Enterprise Debuts - Please click here to visit RF Cafe.
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Space Shuttle Enterprise Debuts
September 17, 1976


The U.S. Army Army Force became the U.S. Air Force - Please click here to visit RF Cafe.
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The U.S. Army Army Force became
the U.S. Air Force
September 18, 1947


1st Smiley Face Appeared on a Bulletin Board - Please click here to visit RF Cafe.
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1st Smiley Face Appeared on a Bulletin Board
September 19, 1982


World's 1st Radio Newscast at KDKA - Please click here to visit RF Cafe.
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World's 1st Radio Newscast at KDKA
September 20, 1921


Autumnal Equinox. Please click here to visit RF Cafe.
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Autumnal Equinox. Please click here to visit RF Cafe.
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Autumnal Equinox (1st day of Autumn/Fall)


TI Introduced the DATAMATH Series of Calculators - Please click here to visit RF Cafe.
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TI Introduced the DATAMATH Series of Calculators
September 22, 1972


Robert Bosch Born Today - Please click here to visit RF Cafe.
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Robert Bosch Born Today
September 23, 1861


USS Enterprise - World's 1st Nuclear-Powered Aircraft Carrier Launched - Please click here to visit RF Cafe.
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USS Enterprise - World's 1st Nuclear-Powered Aircraft Carrier Launched
September 24, 1960


Collins Radio Company Incorporated - Please click here to visit RF Cafe.
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Collins Radio Company Incorporated
September 25, 1933


Happy Birthday Seymour Cray! - Please click here to visit RF Cafe.
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Happy Birthday Seymour Cray!
September 28, 1925


Happy Birthday Enrico Fermi! - Please click here to visit RF Cafe.
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Happy Birthday Enrico Fermi!
September 29, 1901


Johannes (Hans) Wilhelm Geiger Born Today - Please click here to visit RF Cafe.
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Johannes (Hans) Wilhelm Geiger Born Today
September 30, 1882
October
1st Ford Model T Built - Please click here to visit RF Cafe.
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1st Ford Model T Built
October 1, 1908


Happy Birthday Peanuts!  Please click here to visit RF Cafe.
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Happy Birthday Peanuts!
October 2, 1950


Transistor Patented by Shockley, Bardeen and Brattain - Please click here to visit RF Cafe.
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Transistor Patented by
Shockley, Bardeen and Brattain
October 3, 1950


Sputnik. Click here to return to the RF Cafe homepage
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Sputnik Launched - The Space Age Begins
October 4, 1957


Happy Birthday Robert Goddard! - Please click here to visit RF Cafe.
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Happy Birthday Robert Goddard!
October 5, 1882


George Westinghouse Born Today - Please click here to visit RF Cafe.
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George Westinghouse Born Today
October 6, 1846


Neils Bohr Born Today. Click here to return to the RF Cafe homepage.
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Neils Bohr Born Today
October 7, 1885


Erie Canal Inaugurated. Click here to return to the RF Cafe homepage.
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Erie Canal Inaugurated
October 8, 18
23

U.S. Naval Academy Opened. Click here to return to the RF Cafe homepage.
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U.S. Naval Academy Opened
October 10, 1845


Kathryn Sullivan Became 1st U.S. Woman Spacewalker. Click here to return to the RF Cafe homepage.
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Kathryn Sullivan Became 1st U.S. Woman Spacewalker
October 11, 1984


Columbus Day. Click here to return to the RF Cafe homepage.
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Columbus Day
2nd Monday in October


1st Cellular Service Launched.  Please click here to visit RF Cafe.
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1st Cellular Service Launched
October 13, 1983


Chuck Yeager breaks the sound barrier.  Please click here to visit RF Cafe.
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Chuck Yeager Breaks the Sound Barrier
October 14, 1947


Buon Compleanno, Evangelista Torricelli!  Please click here to visit RF Cafe.
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Buon Compleanno, Evangelista Torricelli!
October 15, 1608


Radio Corporation of America Established.  Please click here to visit RF Cafe.
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Radio Corporation of America Established
October 17, 1919


British Broadcasting Company Formed.  Please click here to visit RF Cafe.
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British Broadcasting Company Formed
October 18, 1922


1st Commercial Wind Power at Grandpa's Knob, VT.  Please click here to visit RF Cafe.
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1st Commercial Wind Power at Grandpa's Knob, VT
October 19, 1941


Alfred Nobel born today.  Please click here to visit RF Cafe.
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Alfred Nobel Born
October 21, 1833


Princeton (College of NJ) Received Its Charter.  Please click here to visit RF Cafe.
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Princeton (College of NJ) Received Its Charter
October 22, 1746


Today is Mole Day - 6.02 x10^23.  Please click here to visit RF Cafe.
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Mole Day - 6:02 am to 6:02 pm on 10/23
October 23


Bulova Accutron 214 Introduced. Please click here to visit RF Cafe.
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Bulova Accutron 214 Introduced - 1st Electronic Watch
October 25, 1960


Maiden flight of the P-51 Mustang.  Please click here to visit RF Cafe.
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Maiden flight of the P-51 Mustang
October 26, 1940


KDKA Assigned Its Call Letters.  Please click here to visit RF Cafe.
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KDKA Assigned Its Call Letters
October 27, 1940


Statue of Liberty (a gift from France) Was Dedicated.  Please click here to visit RF Cafe.
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Statue of Liberty (a gift from France) Was Dedicated
October 28, 1886


The first mesage via ARPANET was supposed to be "LOGIN," but it crashed after just the "L" and the "O."  Please click here to visit RF Cafe.
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1st Message Sent via the ARPANET
October 29, 1969


"The War of the Worlds" was broadcast.  Please click here to visit RF Cafe.
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"The War of the Worlds" was broadcast.
October 30, 1938


Narinder Singh Kapany Born - "Father of Fiber Optics" -  Please click here to visit RF Cafe.
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Narinder Singh Kapany Born
"Father of Fiber Optics"
October 31, 1927
November
Don't forget to reset you clock for Daylight Saving Time.  Please click here to visit RF Cafe
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Daylight Saving Time
Begins 2nd Sunday in March
Ends 1st Sunday in November
1st Hydrogen Bomb Detonated.  Please click here to visit RF Cafe.
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1st Hydrogen Bomb Detonated
November 1, 1952


Howard Hughes' Spruce Goose makes it's 1st and only flight.  Please click here to visit RF Cafe.
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Spruce Goose's 1st and only flight
November 2, 1947


Happy Birthday Daniel Rutherford!  Please click here to visit RF Cafe.
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Happy Birthday Daniel Rutherford!
November 3, 1749


Happy Birthday Benjamin F. Goodrich!  Please click here to visit RF Cafe.
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Happy Birthday Benjamin F. Goodrich!
November 4, 1841


1st engineering college in U.S. - Rensselaer (RPI).  Please click here to visit RF Cafe.
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1st engineering college in U.S. - Rensselaer (RPI)
November 5, 1824


Happy Birthday Marie Curie!  Please click here to visit RF Cafe.
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Happy Birthday Marie Curie!
November 7, 1867


Happy Birthday Edmond Halley!  Please click here to visit RF Cafe.
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Happy Birthday Edmond Halley!
November 8, 1656


Happy Birthday Carl Sagan!  Please click here to visit RF Cafe.
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Happy Birthday Carl Sagan!
November 9, 1934


United States Marine Corps Established.  Please click here to visit RF Cafe.
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United States Marine Corps Established
November 10, 1775


Veteran's Day - Honoring All Who Served.  Please click here to visit RF Cafe.
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Veteran's Day - Honoring All Who Served
November 11


Happy Birthday Leo Baekeland!  Please click here to visit RF Cafe.
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Happy Birthday Leo Baekeland
November 14, 1863


Intel Introduced the 4004 Microprocessor.  Please click here to visit RF Cafe.
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Intel Introduced the 4004 Microprocessor
November 15, 1971


SETI's Arecibo Message Sent.  Please click here to visit RF Cafe.
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SETI's Arecibo Message Sent
November 16, 1974


Alles Gute zum Geburtstag August Möbius August Möbius.  Please click here to visit RF Cafe.
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Alles Gute zum Geburtstag August Möbius
November 17, 1790


Happy Birthday Alan Shepard.  Please click here to visit RF Cafe.
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Happy Birthday Alan Shepard
November 18, 1923


Happy Birthday Eileen Collins!  Please click here to visit RF Cafe.
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Happy Birthday Eileen Collins!
November 21, 1956


Microsoft Windows 1.0 Released.  Please click here to visit RF Cafe.
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Microsoft Windows 1.0 Released
November 20, 1985


1st Untethered Manned Hot Air Balloon Flight.  Please click here to visit RF Cafe.
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1st Untethered Manned Hot Air Balloon Flight
November 21, 1783


B2 Stealth Bomber Unveiled.  Please click here to visit RF Cafe.
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B2 Stealth Bomber Unveiled
November 22, 1988


John Wallis - Mr. Infinity - born today.  Please click here to visit RF Cafe.
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John Wallis - Mr. Infinity - born today
November 23, 1616


First Ad Appeared for a Wireless Telegraph Set.  Please click here to visit RF Cafe.
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First Ad Appeared for a Wireless Telegraph Set
November 25, 1905


Happy Thanksgiving!  Please click here to visit RF Cafe.
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Happy Thanksgiving
4th Thursday in November


Happy Birthday Konosuke Matsushita!  Please click here to visit RF Cafe.
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Happy Birthday Konosuke Matsushita!
November 27, 1894


Happy Birthday Christian Doppler!  Please click here to visit RF Cafe.
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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
Happy Birthday Martin Heinrich Klaproth.  Please click here to visit RF Cafe.
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Happy Birthday Martin Heinrich Klaproth
December 1, 1743


1st Sustained Fission Reaction.  Please click here to visit RF Cafe.
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1st Sustained Fission Reaction at Univ. of Chicago
December 2, 1942


Happy Birthday John Backus!  Please click here to visit RF Cafe.
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Happy Birthday John Backus!
December 3, 1924


Happy Birthday Clyde Cessna!  Please click here to visit RF Cafe.
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Happy Birthday Clyde Vernon Cessna!
December 5, 1879


Pearl Harbor Day.  Please click here to visit RF Cafe.
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Pearl Harbor Day
December 7, 1941


Coaxial Cable Patent Day.  Please click here to visit RF Cafe.
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Coaxial Cable Patent Day
December 8, 1931


Happy Birthday Grace Hopper!  Please click here to visit RF Cafe.
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Happy Birthday Grace Hopper!
December 9, 1906


Happy Birthday Carl Gustav Jacob Jacobi!  Please click here to visit RF Cafe.
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Happy Birthday Carl Gustav Jacob Jacobi!
December 10, 1804


Happy Birthday Sir David Brewster!  Please click here to visit RF Cafe.
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Happy Birthday Sir David Brewster!
December 11, 1781


Marconi sent 1st transatlantic radio message: dit, dit, dit.  Please click here to visit RF Cafe.
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Marconi sent 1st transatlantic radio message
dit, dit, dit (•••, the letter "s")
December 12, 1901


Happy Birthday Ernst Werner von Siemens.  Please click here to visit RF Cafe.
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Happy Birthday Ernst Werner von Siemens
December 13, 1816


Happy Birthday Tycho Brahe.  Please click here to visit RF Cafe.
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Happy Birthday Tycho Brahe!
December 14, 1546


Happy Birthday Gustav Eiffel!  Please click here to visit RF Cafe.
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Happy Birthday Gustav Eiffel!
December 15, 1832


World's 1st Transistor Invented.  Please click here to visit RF Cafe.
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World's 1st Transistor Invented
December 16, 1947

Battle of the Bulge.  Please click here to visit RF Cafe.
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Battle of the Bulge
December 16, 1944


Anniversary of Powered Flight - the Wright Brothers.  Please click here to visit RF Cafe.
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Anniversary of Powered Flight
December 17, 1903


Edwin Armstrong - Invented frequency modulation, superheterodyne & regenerative receivers.  Please click here to visit RF Cafe.
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Happy Birthday Edwin Armstrong!
Born December 18, 1890


SCORE Satellite Launched.  Please click here to visit RF Cafe.
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SCORE Satellite Launched
December 19, 1958


Robert Van de Graaff.  Please click here to visit RF Cafe.
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Robert Van de Graaff
Born December 20, 1901


Winter Solstice.  Please click here to visit RF Cafe
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Winter Solstice (1st day of winter)


SR-71 Blackbird Maiden Flight.  Please click here to visit RF Cafe
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SR-71 Blackbird Maiden Flight
December 22, 1964


1st Manned Orbit of the Moon by Apollo 8.  Please click here to visit RF Cafe
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1st Manned Orbit of the Moon by Apollo 8
December 23, 1968


Happy Birthday James Joule!  Please click here to visit RF Cafe
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Happy Birthday James Joule!
Born December 24, 1818
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!   Please click here to visit RF Cafe.
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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


Happy Birthday Charles Babbage!  Please click here to visit RF Cafe
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Happy Birthday Charles Babbage!
Born December 26, 1791

Happy Birthday Clemens Winkler! Click here to return to the RF Cafe homepage.
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Happy Birthday Clemens Winkler!
December 26, 1838


Happy Birthday Johannes Kepler!  Please click here to visit RF Cafe
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Happy Birthday Johannes Kepler!
Born December 27, 1571


Admiral Sold the 1st Color Television Set.  Please click here to visit RF Cafe
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Admiral Sold the 1st Color Television Set
Born December 30, 1953


Last Calvin and Hobbes comic strip.  Please click here to visit RF Cafe.
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Last Calvin and Hobbes Comic Strip
December 31, 1995

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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.
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