On Tue, Aug 14, 2001 at 03:46:38PM -0700, Meredith S wrote: > > Actually, it probably has to do w/ the frequency / harmonic resonance of > the phone interfearing w/the AP ... not the proximity. Even if the phone > operates on a different frequency, it can interfere w/ the AP via harmonic > resonance. > Harmonic Resonance occurs when one of the frequencies is a multiple of the > other. Say your AP operates at 2 hz ( for simplicity sake) and your phone > operates at 4 hz, then every other cycle of the phones frequency will be in > phase w/ the access points. > > ASCII Diagra: > | x -- sine peak As you can see, the sine > waves are prefectly > | | | | | Phone in-phase at 2 and 4 w/ > respect to the phone. > | | | | | | | | | > | | | | | > |_________________________________ T = 1 sec > | > | x -- sine peak > | | | > | ....| |.....| |. Access Point > | | | > | | > __________________________________ T = 1 sec > > Are there any Ham operators out there that can confirm or deny this? > > -- Meredith Shaebanyan I am no Ham operator, but I read about this in school (studied electrioncs, HiFi system and so on). IIRC this is correct, a higher/lower frequency resonates every 1/2 of the currently frequency at half the effect. So lets say we are at 8 Hz originally, you will have your first set of "ghosts" at 4 rep. 12 Hz at half the original effect. Second round of "ghosts" is at 2 and 14 Hz at a 1/4 of the original effect and so on... Again, it was over 5 years ago I studied or worked with this stuff. /Mike [rest of message truncated to save bandwith] -- There is no such thing as a system that is secure out of the box. Tim [Timothy M. Mullen, CIO of AnchorIS.Com] claimed earlier this morning that he had found one at Val-Mart the other day that was secure out of the box, but as it turns out that was a Nintendo. -- Jesper M Johansson, Ph.D. Assistant Professor of Information Systems at Boston University - during a SANS audio broadcast ---------------------------------------------------------------------------- This list is provided by the SecurityFocus Security Intelligence Alert (SIA) Service. For more information on SecurityFocus' SIA service which automatically alerts you to the latest security vulnerabilities please see: https://alerts.securityfocus.com/
This archive was generated by hypermail 2b30 : Thu Aug 16 2001 - 07:42:21 PDT