[Dstar] D-Star Digital Data

[Tony Langdon]

At 07:27 PM 9/2/2009, you wrote:

>Upon re-reading the specifications I now see that ;-)
>Which explains your next comment!

Yep. Thought I'd try and clear up some misconceptions about DV and 
its low speed data channel.

>I hope so!! Got 10 months of it to go, don't want it to become boring :p

I'm sure it won't. :)

>That is a fair call, I have some idea's but until I have completed
>some experimentation (so that I know what I'm talking about...) I am
>not planning on discussing them in microscopic detail on a public
>forum. Though I am anticipating that the outcomes of this
>experimentation will be up for discussion.

I think the issues will be cultural.  Mixed mode repeaters (e.g. 
FM/P25) do work well in commercial circles, because commercial 
systems are typically shared by groups that have no association with 
each other, so one group working FM and one using P25 isn't a 
problem.  It works much like a system that uses different CTCSS for 
each user group.  Amateurs are a different lot, and want to be able 
to monitor and utilise the frequency when they feel like 
it.  Amateurs are not distinct groups (though sometimes it seems like it!).


> > Building a D-STAR software defined repeater is entirely feasible, as you
> > basically need to perform GMSK modulation and demodulation, and the rest is
> > pushing data bits around.  With D-STAR, the RF side is only half the story,
> > there's also the Internet infrastructure, which provides the long 
> haul links
> > between sites. :)
>
>Got the RF side worked out, as you say it is feasible. Still reading
>the manuals on  the gateway systems! But if you have more info on how
>the Gateway system works that would be good!

Good luck!  You might have to ask around overseas also, as there's 
been a bit of reverse engineering done. :)

73 de VK3JED / VK3IRL
http://vkradio.com