RF Cafe Software
About RF Cafe
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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The Christmas card industry might be fooling most people, but they ain't foolin' me! This season's level of glitter-shedding cards is at an all-time high, which serves to confirm conclusively what I have suspected for years - the Christmas card companies and the computer companies are in cahoots to see to it that there is plenty of that colorful, electrically conductive material spread around to guarantee it will get sucked into computers with forced-air cooling to land on and short out circuits! That's right, it simply cannot be a coincidence that the sales of notebook and desktop computers rises markedly each year between Thanksgiving and Christmas.
Being the traditionalist kind of guy that I am, Melanie and I still mail actual Christmas cards every year - and even put hand-written messages in each one - so this time when I marveled over the massive quantity of glitter that covered the dining room table after a writing session, the little light bulb (an incandescent one, not a CFL) went on in my cranium. In a near panic I quickly grabbed a damp rag to collect all the evil little short-circuit-looking-for-a-place-to-happen metal squares before any one of them could work its diabolical deed on my nearby notebook computer.
My trusty digital caliper measured the smallest chuck of glitter at about 0.22 mm (8.7 mils), and the largest as huge as 0.8 mm. Considering that lead spacing on fine pitch surface mount components like the thin quad flat pack (TQFP) is around 0.4 to 0.8 mm, a single piece of glitter, which might have a non-conductive color layer on its top and bottom surfaces but exposed, conductive edges, could easily bridge the leads and/or unprotected PCB solder pads.
You might think I've gone off my rocker, but each day as we open reciprocated Christmas cards, I have been witnessing levels of glitter everywhere that I had never noticed in previous years. A quick check of the country of origin shows that nearly all were made in China (what isn't these days?). However, given the latest international incident with North Korea and its cyber attack on Sony Pictures, I'm calling for a Congressional investigation into whether a wave of gray market Christmas cards has flooded the market this year.
Sorry to seem like the Grinch, but I feel it's my duty to alert you to potential acts of technological sabotage.
Posted December 23, 2014