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[aprssig] Future for aprs Faster, cheaper and now!

Robert Bruninga bruninga at usna.edu
Sun Sep 9 02:58:00 UTC 2012


> I've been playing with the 500 mW RFM12BP modules for a while.
> If there's going to be any serious use of these, we need a standard.
> Right now I'm using 4800 baud with Hamming(7,4) error correction and
> very basic framing.

Great!  There is real potential here!

These things run on a few tens of mA at 3 volts and could last a week on 2
AA cells.

I can envison these things in 6" miniboxes with 6" solar panels being
placed every few miles or so by hams anywhere they can think of and get
access to.  This self deploying and self networking system could be as
powerful for Ham radio as the cell phone system (well, not really, but it
would be all OURS).

These things have complete real-time power control from 5 mw to 100 mw and
have receive signal detect in -.5 dB increments.  They could self learn
their connectivity and can SELF LEARN the paths needed to deliver traffic.
All those people that wanted to re-invent the APRS digipeating system
could have a field-day writing their own best ideas for routing.

Again, this is not in competition with APRS but is a low cost extension
for the mobile operator, providing us greater density, higher mobile
update rates, and bandwidth on demand for sending images and files during
emergencies.  Kind of a flea-power Dstar system at 1% of the cost.

Many will rightly point out that I have no idea what I am talking about.
Please do.  And then I hope they will tell us how to do it right.  This is
a clean canvas, show us what kind of grassroots ham network we can build
and how...  I'd love to see it!

Bob, Wb4APR

On 9/8/2012 11:35 AM, Robert Bruninga wrote:
> New for APRS mobile?  How about a $12 transceivr that is as sensitive as
> any modern APRS radio, is frequency agile and has 100 mw TX power
> operating on UHF?
>
> It can operate anywhere from 2400 to 100Kbaud on 2 AA cells.  I can
> imagine an APRS distributed mobile data network that can handle 100
> times more mobiles plus high data rate transfer of images for better
> first responder and emergency support type communications.
>
> I'm sure someone has suggested these modules in the past, but I just
> looked at the specs and am AMAZED at what they have crammed into this
> POSTAGE STAMP sized UHF transceiver.
>
> Stuart Robinson in the UK just turned me on to his project to use these
> modules in small satellties and balloons, but I can envision a
> "digipeater node" in evry neighborhood, building, tower and hill
> providing a dense high speed amateur data network!  Just hook it to a
> pic processor for the smarts and make it work!
>
> The RFM22 can use any frequency 240mhz to 930mhz, its available in
> versions with the antenna matching centred on 315mhz, 434mhz, 868mhz and
> 915mz. The RFM22 is a transceiver, costs around $12.
>
> Seems like everything is there!  Go for it!
>
> Bob, Wb4aPR,
>
>
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