900MHz packet radio?

Scott Weisman sweisman at pobox.com
Thu Sep 1 07:18:21 UTC 2011

I 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.


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.
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