From: Andrew Johnson
Date: 2005-09-27 11:03:17
This was on 22nd Sept 2005. David Boyle is the questioner www.checktheevidence… 2.2 megs download, 1 min 22 seconds playing time. David Dimbelbys 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.