![]() ![]() |
gingereejit: I was at a IET Presentation last week by ALu's CTO Martin Sharrock where he explained why GSM phones cause a buzz
It's due to the way GSM, which uses TDMA splits the frequency up into timeslots, IIRC TDMA uses 1/8th sec slots - so a broadcast network of 1800 or such or going to have a pulse rate of around 217Hz which is in the audible range and is picked up up by poorly shielded speakers.
It's essentially your phone saying to the tower - 'Give me slot Give me slot Give me slot Give me slot and now We're connected' or "ready to receive ready to receive ready to receive ready to receive and now We're connected'
![]() ![]() |