From: Andrew Johnson
Date: 2005-09-27 11:00:03
This was on 22nd Sept 2005. David Boyle is the questioner www.checktheevidence… David Dimple’s response, not surprisingly, does not take into account the difficulty with successfully making cellphone calls from aircraft. www.physics911.net/p… When I worked with GSM (mobile) communications in the period 1995-1997 (the company I worked for were developers for some small Nokia projects), we knew that GSM communications only worked reliably when travelling at speeds of about 140 mph (relative to a base station). This page shows similar information www.bitpipe.com/data… This is due, I believe, to Doppler effects on the transmitted and received radio signals. Time Division Synchronous Code Division Multiple Access (TD-SCDMA). TD-SCDMA systems can be connected to existing GSM networks, which allows simple and cost-effective internetworking between 2G and 3G network operations. Data can be sent and received while traveling at very high speeds of up to 150 mph.
