1996 - 2016
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 ...
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This collection of video and a few audio files represents files that have been featured on the RF Cafe homepage. Every week or so a new file is added that should be of interest to RF Cafe visitors.
Please send me an e-mail if you have a good subject. Note: "Videos for Engineers" formerly went by the name "Cool Videos."
Get ready to flip the dial on your compass by 180° soon. Well not real soon, but indications
point to another reversal of the Earth's magnetic field reversal in as little as
To more accurately investigate the phenomenon, researchers at the U. of MD have constructed a 30-ton
sphere that spins at more than 90 mph to generate magnetic fields. The 10-ft sphere is filled with 13.5
tons of liquid sodium to mimic the Earth’s liquid-iron center core. A 3.3-ft sphere counterrotates inside
the larger one.
This robotic pack "animal" is so life-like that
it is shocking. You would swear it is some kind of hoax - but it definitely is not! If you have not
already watched the video of Boston Dynamics' Big Dog in action, you need to do so now.
If not for being
so pathetic, it would be funny. Watch/listen as a politician reads into the Congressional Record the
EPA's procedure for properly handling the cleanup and disposal of CFL light bulbs. Hopefully, by the
time the light bulb police require us all to stop using incandescent bulbs, the LED models will be available.
of playing an air guitar. Well, this is sort of an air amp + speaker + light show all in one. All the
action is provided by a Tesla Coil that is rigged to respond to an electric guitar. There is not a lot
of background info on the contraption, or even the inventor. It definitely passes the geek test.
An IEEE reporter gives a brief tour of the $8B, Large Hadron
Collider (LHC), operated
by CERN. This is the machine that
kooks have sued to try to keep from operating, fearing the creation of an Earth-swallowing
black hole. The LHC made its debut 1-way test last week, 20 years after breaking ground. The 12 kiloton,
5-story main detectors contain enough wire to wrap 7x around earth.
pond scum into biofuels is the crowning achievement of Valcent Products, which has developed a conversion
system that uses engineered algae. Unlike current processes that waste consumable food crops to produce
less than break-even energy yields just to make certain types feel good about themselves, no child
(human, anyway) will go hungry because of Vertigro production. A
hectare of processing area can yield more than 48,000 L of oil per year, while the same area of a corn
field gets you only 40 L/yr. Founder Kertz predicts refinement of the process can eventually yield 150,000
L/hectare/year. Here is a video of the process.
If you have an HP 54600B o-scope sitting around the
lab, here is a way to reduce a little stress. #1 Power on the scope. #2 Press the button "Print/Utility"
once. #3 Hold function buttons 2 and 3 down at the same time, for half a second. Play Tetris! Maybe
it works on other models as well.
Watch a Boeing 777 be fully assembled,
painted and flown in 4 minutes and 10 seconds. Engineering projects of this magnitude always amaze me
when I consider the logistics involved: materials sciences, human factors, electronics, aerodynamics,
communications, computer simulations, and much more. Thanks to Cornell.
I wish I understood Japanese and knew what
these guys are saying. Evidently, building and operating giant air vortex guns is great sport in Japan.
Adding smoke to the mix for enhanced visualization gives it a cool, menacing, sci-fi look.
Here is why your mother told you to never stand
under a tree during a lightning storm. What's the safest place to be while outside? In your car. Supposedly,
nobody has ever been killed (at least in Canada) when lightning struck the car he/she was in. It is
due to that Faraday Shield thing at work.
Lehigh University mechanical engineering students and profs introduced
Broughal MS students to the process of computer-based
design and manufacturing by helping them modify their Matchbox cars for a good old-fashioned downhill
race (w/modern electronic timer). They aerodynamically shaped the car, then created wax and aluminum
molds for producing plastic prototypes of their designs.
video shows how an electron rides on a light wave after just having been pulled away from an atom. This
is the first time an electron has ever been filmed in this way. "We demonstrate a quantum stroboscope
based on a sequence of identical attosecond pulses that are used to release electrons into a strong
infrared laser field exactly once per laser cycle."