802.11 MAY be a solution though the hidden transmitter problem still bothers me. Directional antennas increase distance but limit all stations being heard. point to point works for links but I'm looking at the case of many users in a metro area sharing a common resource, probably in a partial mesh star topology (many users linked via one node who can't hear each other. Full duplex would be usefull as well and I could forsee many of the end users of this network regularly moving large files between nodes (iso images for example or installing/mirroring the latest suse) and realtime digital AV streaming would probably be an often used app. -Galt On Fri, 16 Jul 2004 08:50:44 +0200, Christian Mang wrote:

Hi Galt,

what do you think about commercial wlan products? Ok, it's no amateur radio, but architecture and os independent. Which distance would you reach with your solution?

73 Chris db1mcj

-----Original Message----- From: John Galt [mailto:galt.john@gmail.com] Sent: Friday, July 16, 2004 7:03 AM To: suse-ham-e@suse.com Subject: [suse-ham-e] high speed data

Is anyone implimenting high speed (1Mb/sec or greater for end users) WAN networking under amateur radio and linux or has this just died on the vine for people's refusal to use anything faster than a shared 9600 baud channel on a porly architected network.

-Galt

-- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." Benjamin Franklin

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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