[aprssig] Mobile Packet Range
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.
> -----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.)
> Joseph M. Durnal wrote:
> > D-Star is great technology, but try putting a D-Star
> station together
> > for less than $100!
This mail has been scanned by Palmer Cook Computer Services Limited. www.palmercook.co.uk
More information about the aprssig