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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 ...

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A New Wind Chill Chart
Kirt's Cogitations™ #118

These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.

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A New Wind Chill Chart
It has been said that the only thing constant in this world is change, and now even the familiar old wind chill chart has been revamped. The old formula for the chart was derived in the 1940s by a method that noted the length of time required for a bottle of water to freeze under a variety of wind speeds and air temperatures. Since little was known about the thermal transfer properties of skin at the time, the chosen plastic container skewed the results. The old chart yielded a wind chill factor that was too low - by tens of degrees Fahrenheit in extreme cases. Using modern methods that involve bringing the skin of human volunteers to near freezing, a new formula - and new chart - was born in the year 2000. An example: A 20 °F day with 10 mph wind, now has a wind-chill rating of 9 °F instead of 3 °F.