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Scott Weisman sweisman at pobox.comI think you would be better taking your existing hardware, which must be somewhat custom to begin with (since it works over wifi) and use something like a HopeRF module (http://www.hoperf.com/) or similar. HopeRF has transceivers with power output up 100mW, data rates up to 256kbps, and a choice of 4 different bands (315, 433, 868, 915). This sounds like it would be a far easier choice to incorporate into your already-working system than hacking OsmocomBB-capable phones. There is a lot of development from many different companies in this area and quite a bit of hacker activity as well. Scott On Thu, Sep 1, 2011 at 7:11 AM, Paul Gardner-Stephen <paul at servalproject.org > wrote: > Greetings all, > > At the Serval Project we have created a mobile mesh telephony system > that currently works over wifi. > > From the outset, we have wanted to get it working on the ISM915 and/or > ISM868 bands that are located adjacent to the GSM 850/900 frequency > allocations. > > My initial investigations and enquiries indicate that this should be > possible by creative programming of the baseband processor in many > models of phones. The trick, as I suspect you well know, is the > difficulty in getting the information and tools required to reprogram > these radios. > > I am now in a position to potentially fund further work on this. > > So, as the open-source group with the most experience reprogramming > baseband radios, what is the feasibility of creating a > proof-of-concept using the types of phones you already work with to > send and receive arbitrary data packets without reliance on a cell > tower (even for time synchronisation)? > > I know there are a lot of constraints and problems, but I am most > interested in creative solutions that can get us to a working > prototype, however crude, that can be used to demonstrate the > feasibility of what I am proposing. > > If this discussion is off-topic here, I am happy to hold the > conversation at the serval-project-developers google group, but I am > equally comfortable with it continuing here. > > Thanks in advance, > Paul Gardner-Stephen. > Shuttleworth Telecommunications Fellow at Flinders University. > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20110901/286f4d9b/attachment.htm>