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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Cool Pic Archive #3


These images have been chosen for their uniqueness. Subject matter ranges from historic events, to really cool phenomena in science and engineering, to relevant place, to ingenious contraptions, to interesting products (which now has its own dedicated Featured Product category).

Cool Pic Archive Pages

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |

NOAA photo: A waterspout off the Florida Keys photographed from an aircraftNOAA photo: A waterspout off the Florida Keys photographed from an aircraft.


Researchers in Australia use two-photon polymerization to create a miniature model of the Sydney Opera House.Researchers in Australia use two-photon polymerization to create a miniature model of the Sydney Opera House.


This is one of a variety of unique digital clocks on the Cathode Corner website. The scope clock displays the time on a small oscilloscope tube.This is one of a variety of unique digital clocks on the Cathode Corner website. The scope clock displays the time on a small oscilloscope tube.


Click here for full-size imageWrong taxiway.

Guess the number of stars and win a prize. Well, not really. This is a photo of the Moose Nebula in front of an unimaginably dense cluster of stars in the Milky Way galaxy. Taken with the France-Canada-Hawaii telescope atop Mauna Kea. Lots of other great pics on this website.Guess the number of stars and win a prize. Well, not really. This is a photo of the Moose Nebula in front of an unimaginably dense cluster of stars in the Milky Way galaxy. Taken with the France-Canada-Hawaii telescope atop Mauna Kea. Lots of other great pics on this website.


Helmet of Jim Lovell during the Apollo 8 lunar mission in 1968 bears microscopic pits left by bombarding cosmic rays. Shown are silicone rubber replicas of the tracks (about 0.02" long) cosmic rays left in helmets worn by astronauts on the Apollo 12 mission.Helmet of Jim Lovell during the Apollo 8 lunar mission in 1968 bears microscopic pits left by bombarding cosmic rays. Shown are silicone rubber replicas of the tracks (about 0.02" long) cosmic rays left in helmets worn by astronauts on the Apollo 12 mission.


This Panasonic CF-M34 titanium-jacketed Toughbook notebook computer took a bullet for a U.S. soldier in Iraq in April, 2003.This Panasonic CF-M34 titanium-jacketed Toughbook notebook computer took a bullet for a U.S. soldier in Iraq in April, 2003.


Scientific glassblowing is a huge business. All those complex types of twisting, bubbling liquid-filled glass contraptions from Dr. Frankenstein's laboratory are still in use today. This site shows what state-of-the-art equipment can do.Scientific glassblowing is a huge business. All those complex types of twisting, bubbling liquid-filled glass contraptions from Dr. Frankenstein's laboratory are still in use today. This site shows what state-of-the-art equipment can do.

Fissure line point between the North American and Eurasian tectonic plates, in Thingvellir, Iceland. Don't stand too close for too long.Fissure line point between the North American and Eurasian tectonic plates, in Thingvellir, Iceland. Don't stand too close for too long.
Something Old, Something New, Something Borrowed, Something.... Well, you know how it goes, but here's a new CD player that you won't believe!Something Old, Something New, Something Borrowed, Something.... Well, you know how it goes, but here's a new CD player that you won't believe!

 
50:1, 600W radial power combiner from Ciao Wireless. There's a cool 68:1 combiner picture on the base website, too.50:1, 600W radial power combiner from Ciao Wireless. There's a cool 68:1 combiner picture on the base website, too.


3-D rotating gravity map of the Earth. NASA 2003.3-D rotating gravity map of the Earth. NASA 2003.

Recognize anyone here?Recognize anyone here?



"Ç" - The Rocket Formerly Known As Black. This is one of the many very large model rockets flying today. Click here to watch a launch."Ç" - The Rocket Formerly Known As Black. This is one of the many very large model rockets flying today. Click here to watch a launch.


Thirteen teams from the United States, Korea and Germany will be in Tucson April 9-11 to compete for $6,000 in prize money during the 8th International Micro Air Vehicle (MAV) Competition.Thirteen teams from the United States, Korea and Germany will be in Tucson April 9-11 to compete for $6,000 in prize money during the 8th International Micro Air Vehicle (MAV) Competition.


Brrrrr...........Brrrrr......