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

[Chris Elmquist]

On Tuesday (07/17/2012 at 04:10PM -0500), Mike KBØozn wrote:
> 
> 
> Hi all,
> Doug is correct, ATV is focusing primarly on DVB-S for cost reasons 
> among others.
> Gary, K0GX built a transmitter using boards from BATC at a cost of about 
> $500, and Bill, N0MNB, had a FTA receiver.  It worked well from what 
> they've told me.
> 
> ATSC would be nice of course principally because we all have a receiver 
> for that.

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

> Doug Reed wrote:
> > 
> > I think most of the push on Digital Amateur TV (DATV) has been toward 
> > DVB-S as the mode of choice, although I believe there is some US push 
> > toward ATSC since it is the US broadcast standard. K0GX and N0MNB 
> > recently did some DATV locally on 1.2GHz, but I don't know which system 
> > they were using.
> > 
> > I tend to prefer the DVB-S mode because it works with relatively cheap 
> > FTA (Free To Air) receivers if you add a 1.2GHz preamp, or can be used 
> > with C-band or KU-band LNBF converters at the feed point of the antenna.
> > 
> > The DVB-T dongles are selling in the $15-$20 range on Ebay. DVB-S 
> > receiver boxes are running $30-$40. ATSC tuner cards and dongles start 
> > in the $40 range. The trick with the DVB-T dongles is that we know how 
> > to put the RTL2832U chip into pass-through mode. Nobody has mentioned 
> > doing that on any of the other receivers.
> > 
> > 73, Doug.
> > 
> > Dr. Gerald N. Johnson wrote:
> >> At CSVHF a couple years ago someone proposed using DVB-T for ham digital
> >> TV since the one used for commercial TV has a stiff licensing fee and
> >> very restricted documentation and some say performs poorly when the
> >> receiver or transmitter is in motion, a typical ham operating mode.
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-- 
Chris Elmquist