Re: [Svxlink-devel] Why D-Star ??

[Peter B. <vk...@gm...>]

On Sun, 28 Sep 2008 18:34:20 +0200
Tobias Blomberg <sm...@us...> wrote:

> On Sunday 28 September 2008 16:16:36 Peter Barrett wrote:
> > Hi again and thanks for letting me join the discussion.
> >
> > AFAICS the problem with D-Star is just this thing
> > http://www.dvsinc.com/products/a2020.htm this is whats going on ATM
> > http://www.mail-archive.com/dis...@gn.../msg12698.html
> >
> > Personally I have no issue with it. Its just another super-cockroach to
> > deal with. Looks like it could also be useful for scanners and cop-radio
> > enthusiasts......(aren't we all?)
> 
> Yes, I think AMBE is an annoyance, not a show-stopper. However, the DV-dongle 
> is quite expensive ($200)

the tqfp is abt 20db here in oz.
they may also be rattable from commercial gear etc (tqfp is easier to refloat than sba ;*]
here is one guy's handiwork http://www.moetronics.com/dstar


 and I'm not sure if it can handle more than one 
> audio stream. Can it handle encoding and decoding at the same time as would 
> be needed at a repeater site? And also, if connecting to the D-STAR network 
> via Internet there is another audio stream to encode/decode.
> 
> Of course it's not good for audio quality to decode, process and then encode 
> the audio again. For audio quality, it would be best to route the encoded 
> audio blocks through without decoding/encoding

from the spex simultaneous codec-ing seems to me the very thing ambe2020 was designed to do every 20ms

 but then we loose the ability 
> to mix in other audio, and process it in different ways. Not to mention that 
> the audio handling infrastructure have to be rewritten (again). I wonder how 
> much audio quality is lost in an decode/encode operation.

....maybe not with this chip???  seems to take care of all that??????? I'm rtfm now.....X-8^d
> 
> I'm glad to see that people are working on getting the DV-dongle working under 
> Linux. One day maybe that code can be integrated in SvxLink.

it would be a killer-app. put it on a puppy and hey presto, instant node no hdd reqd
Interfacing a $20 chip.........hmmmm

> 
> 73's de SM0SVX / Tobias
> 
> 
> >
> > 73deVK6FUN
> >
> > my callsign spells my specialty
> >
> >
> >
> >
> >
> > On Sun, 28 Sep 2008 15:01:36 +0200
> >
> > Tobias Blomberg <sm...@us...> wrote:
> > > On Thursday 18 September 2008 21:22:50 Randall Rethlake wrote:
> > > > Greetings to the list!
> > > >
> > > > I am not the worlds biggest fan of Semi-Open Source Software/Hardware
> > > > which is what I feel is the problem with D-Star, and I'm not really
> > > > much of a fan of Icom Inc. (I do own two of their radios though, both
> > > > hand held types...;-) )
> > > >
> > > > Anyway, I think that with the present rich source of programming talent
> > > > available out there (Tobias and anyone else!) to maybe take a
> > > > Open-source Digital Voice format and make it our own.
> > >
> > > I don't like the closed nature of the voice codec either. The problem is
> > > to get wide acceptance from hardware vendors to produce equipment for a
> > > new digital mode and without commercial support that mode will only be a
> > > curiosity for a small number of users.
> > >
> > > > I guess what prompted all this, is reading about APCO P-25 in the
> > > > ARRL's Qst Magazine.
> > > >
> > > > From what I read in QST, it is an Open Standard, and that's why Hams
> > > > can
> > > >
> > > > use it in the States, but whether it's an Exportable technology, I have
> > > > not really looked into yet..
> > > >
> > > > Anyway, There are radios out there that use the P-25 Format that can be
> > > > converted to Ham radio use (2 Mtr, 70 Cm) Just Too-Damm Expensive :-(
> > > > and repeaters....Out of this world !
> > >
> > > This mode sounds interresting. Maybe prices will fall in the future and
> > > equipment will be easier to find. Then it may be of greater interrest.
> > > I'll have to read more about P-25.
> > >
> > > > So, my Idea is This, Why should it not possible to take a Linux Box and
> > > > use it as a Bit-Banger (Bit Regerator) between a transmitter and
> > > > receiver to retransmit the data stream? This could be done as a Linux
> > > > Loadable Module or better yet Compiled within the kernal itself and
> > > > with the proper hooks, the SVXLink software could be loaded on top to
> > > > create REAL honest functionality.
> > > >
> > > > Anyone has a thought or two on this??
> > >
> > > Are you talking about D-STAR, P-25 or something else now?  A D-STAR
> > > signal could certainly be demodulated and then retransmitted without
> > > re-encoding the voice but then SvxLink would not be able to add any
> > > features at all. No roger beep, no EchoLink, no nothing. Just a plain
> > > repeater.
> > >
> > > 73's de SM0SVX / Tobias
> > >
> > > > 73 de Randy.
> > > > ----------------------
> > > > Amateur Radio Station:
> > > > WR0RR
> > > > (Ex: KA0UYL, N0GMX)
> > > > ----------------------
> 
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-- 
Peter Barrett <vk...@gm...>