[aprssig] Mobile Packet Range

Dave Baxter dave at emv.co.uk
Mon Sep 17 06:58:10 CDT 2007

Lots of stuff if you follow the links at...


Found by googling for AMBE, strangely enough.  Just one of dozens of

Including as someone said, a source of dev' kits from the makers.  Dunno
how much in $'s though.

With my limited knowledge of such things, there seems to be quite a bit
of information as to how it all works in the patent details.   Someone
will no doubt rev'engineer it in some time, then come up against a wall
of suits no doubt waving writ's at them.

The chances are, that there are some very similar commercial AMBE based
radios about, or soon to be about, "our" D-Star system could be a quick
way for the makers to get them beta-tested world wide, and get some of
the investment back.

I've not seen or heard a D-Star radio yet, but I have played with some
GSM software based codec's, and you can get quite acceptable audio and
low-ish bit rates with them (messing about over networks) but I have no
idea how they would compare to an AMBE based system.


Dave G0WBX.

> -----Original Message-----
> From: Scott Miller [mailto:scott at opentrac.org] 
> Sent: Saturday, September 15, 2007 8:46 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Mobile Packet Range
> Or without paying money to either Icom or Digital Voice Systems.
> (Hint - you legally CAN'T do the latter.  Every voice D-Star 
> radio has to have an AMBE codec.  You can't duplicate it, you 
> can't disclose how it works even if you pay thousands of 
> dollars for a license, and you can't reverse engineer it.  I 
> can't think of ANYTHING more contrary to the spirit of 
> amateur radio then a mode that depends on one critical piece 
> that we're not ALLOWED to understand.)
> Scott
> N1VG
> Joseph M. Durnal wrote:
> > D-Star is great technology, but try putting a D-Star 
> station together 
> > for less than $100!
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