On Wednesday, April 10, 2002, at 11:22 AM, Trei, Peter wrote: > The argument against shielding is that it is obnoxious that I > (or anyone) should have to go even further than I already do to > maintain even a fraction of the privacy which was naturally available to > every person 150 years ago.
Not to sound too much like Brin, but there was actually very _little_ privacy 150 years ago. Everyone knew who was buying what. Small towns and small neighborhoods. But I digresss... Shielding is much easier than you think, unless shielding is outlawed. > > Folding the bill won't make any difference. stacking them might make > a small difference, if the chips are close enough to detune each other. > Some transponders (not the mu-tag, AFAIK) include anti-collision > techniques, so many can be detected simultaneously. The anticollision features are in the code, not the antennas. Stacking flat antennas on top of either other is _guaranteed_ to cut the output of any of the inner antennas (and probably the edge antennas) by many, many dB. --Tim May "A complex system that works is invariably found to have evolved from a simple system that worked ...A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over, beginning with a working simple system." -- Grady Booch
