Christian For 1Mb/s you merely need 400kHz bandwidth (e.g. with 64-QAM modulation) and even lower if you push too hard... This certainly fits to the 430 band. You can even have 2-3 channel couples centered around 430.5 and 439.5 with a duplexer (9 MHz split is cheap) working full duplex! This could also be an international project in order to have a bigger market and wider acceptance. The problem is who will use (buy) it and who will develop (sell) it... Similar devices already exists at the commercial market at combinations like 64kb/s/25kHz, 128kb/s/50kHz, etc. Here in Greece we had started a similar project 3 years ago, based on the DAMA principle, with lower speeds (160 Kb/s) for the "end user" and 1 Mb/s for the node communication. The idea were based on the 430 band with every station pointing to the node with a small yagi (15 dbi) and about 100 mW power. In the meantime WLAN community has gone a lot further and developers lost interest, so we quit the project... 73's SV1LL Christian Mang wrote:
Hi Galt,
to realize 1Mb/s you will need at least 1Mhz or more bandwidth. This could be a problem on lower frequencies. Maybe 23cm/13cm is ok, but to use it in a city? I got no experience about this high frequencies. On the other hand is 1Mb/s not really much for streaming or copying large files - especially for many users. I don't know a solution for your problem, not even a commercial one.
Chris