On Mon, Feb 07, 2011 at 04:53:48PM -0800, Llew Roberts wrote: > This is only true for VHF frequencies that require line-of-sight to work > properly (which would be of limited use in this scenario). It is not true
Line of sight can be pretty long, under circumstances http://en.wikipedia.org/wiki/Long-range_Wi-Fi > at all for HF frequencies, which can transmit information over long > distances (such as across international territorial boundaries). An interesting approach would be an anarchist millionaire launching a fleet of cellular-like technologies (4G like LTE) in LEO or stratospheric balloons, which would have effectively global coverage, yet be not be easily subjected to local authority pressure, once installed. Even a few LEO birds with a large SSD onboard acting as maildrops and running DTN (there are now patches for Android for that) have pretty good reach, though the latency would suck a bit. Also, you'd need active tracking, or phased array tuned to the bird's ephemerides. > For VHF and UHF, which can actually support very high bit rates, you would > need compatible equipment at all nodes. Each node (hop) would need to be At the moment, buying plenty of 802.11n Buffalos with Linux and mesh on top of it (using IPv6, particularly geographic routing primed from WGS84 at installation, or mutual connectivity mapping) would give you full interoperability. > able to "see" two other nodes, which would each need to see two other nodes, > etc.. The maximum physical distance from node to node would be dependent on > each node's physical horizon. Setting up a[nother] network of nodes across > long distances using these frequencies is going to be very difficult and > expensive. Initially, the best way to set up long-distance links is to tunnel via Internet. Either OpenVPN or Tinc would appear suitable. Later you can rent satellite slots, or actually run your own infrastructure. E.g. Light Peak could become a cheap alternative to SFP and SFP+ over short multimode or monomode distances. > HF radio frequencies that enable reliable communication over long > terrestrial distances don't have enough bandwidth to pass large amounts of > data. 1200 baud is the maximum legal rate that Ham Radio operators can send > using the 10 meter band, which ~28-30 MHz. ("CB" is ~26.xx-27.xx MHz). And > the 10 meter band is not always reliable over long distances... -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE _______________________________________________ p2p-hackers mailing list p2p-hackers@lists.zooko.com http://lists.zooko.com/mailman/listinfo/p2p-hackers
