HI Ed, you should know that managers are full of hot air,and are therefore lighter than engineers and techs....
Derek PS, folks, this was meant as a joke... Price, Edward wrote: > > > > ------------------------------------------------------------------------ > *From:* [email protected] [mailto:[email protected]] *On Behalf Of > *Gert Gremmen > *Sent:* Tuesday, December 09, 2008 12:23 PM > *To:* Pettit, Ghery; Luke Turnbull; [email protected] > *Subject:* RE: Mobile Phones in EMC Labs > > Of course once your gold-plated coaxial connectors wear out, and > your cables became flat from standing on it, > you will see all kind of spurious outdoor signals in your result. > > Gert Gremmen > > > > Although I am naturally pessimistic, I am not superstitious. However, > how else to explain the near magical capabilities of a cable laying on > the floor to attract human feet? > > If I lay a BNC or SMA cable (assuming 1/4" cross section by 10 foot > exposure length) onto the working area (about 16' by 12'), the cable > occupies only 30/27,468, or only about 0.11% of the floor area. > The typical human feet cover 4" by 12" by 2, or 96 square inches. So > there are 27,468/48, or 286, places where you can step in the room. > > You would think that the odds of stepping on the cable would be 285 to > 1. But from experience, as you talk with a visitor in the chamber, how > many times have you looked down to see one of their feet planted > squarely across a cable? Indeed, it's not all that remarkable for a > visitor to managed coverage with both feet. Or to amble along the > cable as if it were some kind of guidance wire! > > Some programs attract a disproportionate amount of official > (management) visitors, and it was during one of those that I > implemented my experiment with sacrificial cables. After walking each > visitor into my chamber, while repeating the mantra of "please be > careful not to step on a cable" and pointing at a cable so that they > understand what a cable looks like, I began to notice the mathematical > anomaly of non-random foot placement. > > I decided to test my suspicions, so, as we moved into conducted > susceptibility testing, I laid four BNC cables around the chamber > working area. (These were cables accumulated during the radiated > emission test; cables which had endured numerous verified foot > stomps.) Then I began watching the visitor pattern. > > I wish I had kept accurate data, for I'm sure that I could have > produced a very important and controversial paper (that could have > given me a decent vacation for its presentation). However, I am left > with only the subjective memory of those trials. I concluded that > cables have some kind of unexplained power to strongly direct the > human mind to place a foot over a cable whenever the physical > opportunity is available. > > Although I never conducted further trials, I have speculated as to the > attractive mechanism that causes this. I wonder if it may somehow be > related to the technique by which cows are kept off of a roadway (cows > will not cross a couple of parallel painted stripes on the ground). > True, this would be an inverse relationship, as cables attract the > foot, but I think I'm really onto something important here. > > BTW, the test cables were all later found to be in acceptable > condition, and were returned to service. I must assume that either I > am being too alarmist about the dangers of stepping on a cable, or, my > management just leaves no lasting impression on physical reality. More > studies are needed! > > > > */Ed Price/* > *[email protected]* <blocked::mailto:[email protected]>* WB6WSN* > *NARTE Certified EMC Engineer* > *Electromagnetic Compatibility Lab* > *Cubic Defense Applications* > *San Diego, CA USA* > *858-505-2780* > */Military & Avionics EMC Is Our Specialty/* > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. To post a message to the list, send your > e-mail to <[email protected] <mailto:[email protected]>> > > All emc-pstc postings are archived and searchable on the web at > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected] <mailto:[email protected]>> > Mike Cantwell <[email protected] <mailto:[email protected]>> > > For policy questions, send mail to: > Jim Bacher <[email protected] <mailto:[email protected]>> > David Heald <[email protected] <mailto:[email protected]>> > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
