On Fri, 13 Jan 1995, Andreas Elbert wrote:

sorry to correct you, but the 900 MHz licensefree radios, the cellular radios (analog and digital) and Modacom and Mobitex are all different animals. i don't want to go into details though, because it doesn't change your main point, the ability to localize one of these radios while transmitting.

However, if there are a large number of 900 MHz radio modems operating in a cryptographically secure spread-spectrum method, it may be very difficult to locate your particular transmitter...however the modem you are talking to will know your pseudonoise sequence, and a receiver that knows this will have a much easier time tracking you down. -Thomas