ETSI EN 300 744 compliant DVB-T transmitter

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dk5ras
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Joined: Fri Mar 01, 2013 3:23 am

Re: ETSI EN 300 744 compliant DVB-T transmitter

Post by dk5ras » Fri Jan 17, 2014 1:29 am

drmpeg wrote:Bogdan Diaconescu YO3IIU has just updated his open source DVB-T implementation to GnuRadio 3.7.2.1 at https://github.com/BogdanDIA/gr-dvbt. It builds (I had to add -DCMAKE_C_FLAGS=-mavx to the cmake command line) and the transmitter GRC flowgraph seems to work. I can't test it since I don't have a DVB-T receiver or dongle.

http://yo3iiu.ro/blog/?p=1191

Ron
"cmake .. -DCMAKE_C_FLAGS=-mavx" was the solution to my build problems with the SSE error. Ron pointed me into the right direction, thanks a lot, just wanted to mention it once again here, to make the relation between the SSE error and the cmake option :) Maybe I am not the only one who steps into this trap...

Ralph.

dk5ras
Posts: 70
Joined: Fri Mar 01, 2013 3:23 am

Re: ETSI EN 300 744 compliant DVB-T transmitter

Post by dk5ras » Mon Jan 20, 2014 12:12 am

Just as an update, the gr-dvbt flowgraph runs just fine, and the spectrum analyzer in gnuradio shows a neat spectrum mask as expected - but the bladeRF only spits out some warbling spectrum, and when listening into the frequency with an AM receiver I hear some warbling sounds. Well, for sure some config issue or thelike, guess I will find it out.

drmpeg
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Re: ETSI EN 300 744 compliant DVB-T transmitter

Post by drmpeg » Mon Jan 20, 2014 9:19 am

For bladeRF, the dvbt_tx_demo.grc flowgraph needs to be changed a little. The rational resampler is not needed (it was put in for the Ettus USRP N210), since the sampling frequency of bladeRF can be set to any number. And of course, the bladeRF osmocom Sink needs to be added.

In Germany, the DVB-T channels are 8 MHz wide, so the bladeRF sampling rate needs to be set to 64000000 / 7 or 9.142857 Msps.

Here's a pic of the modified graph.

Image

Ron

jowijo
Posts: 27
Joined: Sun Jan 05, 2014 9:50 pm
Location: Yakima, Washington

Re: ETSI EN 300 744 compliant DVB-T transmitter

Post by jowijo » Mon Jan 20, 2014 1:01 pm

Been waiting for this release. Will test this with my realtime ATSC chain (avconv + Opencaster) with a DVB-T USB receiver. Would love to test on my actual TV but, being in the US that is a no-go.

argilo
Posts: 6
Joined: Fri Mar 01, 2013 4:58 am

Re: ETSI EN 300 744 compliant DVB-T transmitter

Post by argilo » Sun Mar 02, 2014 8:06 am

I've written a blog post about transmitting DVB-T on the amateur bands, and how to receive it using an RTL-SDR dongle:

http://www.irrational.net/2014/03/02/digital-atv/

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