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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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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Innovative Power Products Combiners / Dividers

Cool Pic Archive #5

Cool Pic Archive Pages

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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).

Part of the prototype of "The Clock of the Long Now" - a 10,000 year clock. If you appreciate mechanical wonders, then you MUST visit this website.

Shear-Thickening Fluid (non-Newtonian liquid) will revolutionize body armor. Bullets and even ice picks are stopped by it. Amazing! U. of Deleware & Aberdeen Proving Grounds research.

Shear-Thickening Fluid (non-Newtonian liquid) will revolutionize body armor. Bullets and even ice picks are stopped by it. Amazing! U. of Delaware & Aberdeen Proving Grounds research.

Andrew Carol's masterpiece version of Charles Babbage's difference engine - made of Legos!

This microfluidics reactor microchip is built from silicon using tunnels, valves, pumps, and porous membranes - amazing!

Lightning striking Balad Air Base in Iraq.

Here are the inner workings of a Metcal SP-200 soldering station - in case you have ever wondered. I bought the entire setup on eBay for $61 (over $250 new).

Piezo actuators change shape when electrically excited. A SQUIGGLE motor consists of several piezoelectric ceramic actuators attached to a threaded nut, with a mating threaded screw inside.

Piles of circuit boards from hazardous computer waste stretch into the distance near an e-waste scrap yard.

StarChase GPS/Wireless ballistic vehicle tagging system for tracking offenders that might otherwise end in a high-speed pursuit.

You have got watch this video: The 85 way was completed in 9 minutes and 46 seconds from the time Chris left the plane until the last legal grip was taken on Annie. We held it for 17 seconds.

County-by-county gas price map of the U.S.

Well, this photo of a toppled transmission tower in Basra, Iraq, is not really "cool" since it represents terrorists destroying the world's accomplishments, but it is interesting.

Magnetic reconnection on the Sun (Earth shown for scale). These are the precursors to the explosive release of energy in a solar flare.

X-Ray of Aibo (Artificial Intelligence Robot) Robotic Dog.

By now we have all heard stories of yellowcake uranium. Here is what it actually looks like.

PC system built entirely from Legos.

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