[NLRS] First tests with DVB-T dongle, ATV angle

[Chris Elmquist]

Thanks Doug.  I did quickly scan the video and I see some live (ie,
from a camera) video in there so that is very interesting.

I'll investigate further and see how these guys did it.

My only suggestion about QAM is that it is another "free" tuner you find
in almost any digital TV--  but I agree it would be a lesser choice for
any over the air applications.

73, Chris N0JCF

On Tuesday (07/17/2012 at 08:30PM -0500), Douglas H Reed wrote:
> 
> 
> <http://www.youtube.com/watch?v=r0Fb8NVUELE>
> I haven't watched the video but Bill N0MNB posted it about the DATV
> test they ran.
> 
> The original discussions about DVB were nearly 10 years ago if I
> remember right. I think it was around 2005 when the Dayton ATV
> repeater was switched to DVB-S. The Chicago ATV group also started
> using DVB-S a couple years later and reported some excellent DX with
> slow rate signals. SInce it is a digital signal, it was good or
> perfect quality reception where analog ATV would have been very snowy
> or maybe just raster.
> 
> I believe the discussion eliminated DVB-C QAM because the multipath
> was random and changing so a mode designed for cable wasn't considered
> a good choice. I believe they went to DVB-S because of robust error
> correction and the capability of slowing down the data rate if there
> was only one video signal. There was a reason they didn't use DVB-T. I
> really don't remember....
> 
> 73, Doug Reed, N0NAS.
> 
> On 7/17/12, Chris Elmquist <chrise at pobox.com> wrote:
> > or QAM but both of these seem insanely complicated to generate at amateur
> > price points, especially if you want to send LIVE video.  You need
> > some pretty serious computational horsepower to do full frame rate MPEG
> > encoding-- which is always harder to encode than to decode.
> >
> > Was the experiment that was performed able to transmit live video?
> >
> > Chris N0JCF
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-- 
Chris Elmquist