RF Cafe Software
About RF Cafe
1996 - 2022
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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April 1956 Popular ElectronicsTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.
Wireless power distribution has been in the news a lot for the last couple years. It began with a goal of just wirelessly charging mobile devices like cellphones, smart watches, and tablet computers. Next came articles about charging electric cars wirelessly while sitting in a parking lot or garage, or even at a stop light. In each instance, the item being charged needed to sit in close proximity to an electric induction coil to be effective. Just a couple days ago, however, a new item appeared where Disney Research has come up with a 'quasistatic cavity resonance' system that covers an entire room. This story from a 1956 edition of Popular Electronics reports on an incandescent lamp powered wirelessly by an RF energy source. It's not quite the same thing, but is the same basic principle.
R.F. Energy Powers Incandescent Lamp
Powered by radio-frequency energy, an incandescent lamp developed by Sylvania is said to be the world's brightest. Its strong, uniform light is especially useful in movie-making. Other uses include color television tube processing, medical research, radar and air traffic control, and computers. The lamp is not connected by wires to the source of its activating energy. It is heated by induction - the r.f. is carried to the outside of the lamp via a copper coil wrapped around it. A d.c. voltage energizes the oscillator; varying the d.c. controls the brightness of the lamp. 'In addition, a water line can be connected to the oscillator to cool both lamp and coil. The lamp uses a disc of special material, instead of tungsten filaments, for its light element.
Posted February 22, 2017