[d-star] Fw: [illinoisdigitalham] Re: New D-STAR Radio Projects

[Doug Reed]

Oh, thanks Mark. I missed that you forwarded it first.
Sounds like a couple interesting things to research.

73, Doug.

Mark Thompson wrote:
> ----- Forwarded Message ----
> From: moe_wheatley <ae4jy at bellsouth.net>
> To: illinoisdigitalham at yahoogroups.com
> Sent: Saturday, July 21, 2007 4:38:38 PM
> Subject: [illinoisdigitalham] Re: Motorola Mototrbo vs D-Star?
>
>
> --- In illinoisdigitalham at yahoogroups.com, "ANDY" <ajr6400 at ...> wrote:
>   
>> Not quite "homebrew", but intersting...
>>
>> http://www.moetronix.com/dstar/
>>
>> Andy..G6MRI....Available via GB7IC  B
>>
>>     
>
> Im not familiar with Mototrbo but have played a bit with dstar.  The 
> DVX project on my website i thought was homebrew but maybe I dont 
> know the definition.  I didn't make the IC's or components but did 
> the design, firmware, and PCB layout.
>
> A key component in all these digital voice systems is the vocoder.  
> P25 uses IMBE from DVSI.  It costs $150K to get the rights to play 
> with that mode plus $5 a seat.  There is no off the shelf IC to do it.
>
> DStar uses AMBE from DVSI.  Same $150K if you want the software 
> source but they do offer a single chip solution for $20 single qty 
> and are happy to sell to hams.  There seems to be a lot of hand 
> wringing because the DVSI chip's source code is not available to hack 
> and so hams should not use it.  I look at it as just another chip 
> like a Pentium processor or ethernet controller ic, who cares that I 
> dont have access to the chip's internal mask set as long as i am able 
> to use it however i want.
>
> The Dstar protocol is all open and can be designed to with a little 
> work.  The internet backbone is also now understood and being 
> documented thanks to Robin,aa4rc.
>
> Am working on two dstar related projects now.  One is now working and 
> is an "AMBE Dongle" which plugs into a PC usb port and looks like a 
> serial port.  The dongle contains an AMBE2020 chip and can be used 
> for voice compression/decompression using a PC.  This will allow 
> dstar operation using a pc and soundcard over the network or whatever.
>
> The other project is a dstar GMSK modulator/demodulator that will 
> allow dstar operation using a non-icom radio. this project is still 
> in the planning stages.  The user interface is the kicker.
>
> Someday i may get back to finishing the original DVX radio project 
> but alas time seems to be a diminishing resource :(
>
> moe ae4jy
>
>
>
>
>
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