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git-artes / gr-isdbt

DTV ISDB-T in GNURadio
http://iie.fing.edu.uy/investigacion/grupos/artes/gr-isdbt/
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Dongle DVB-t RTL2832+RT820t ISDBT 1seg #16

Closed andregcoimbra closed 8 years ago

andregcoimbra commented 8 years ago

Hi,

I have a dongle DVB-t rtl2832+rt820t and was atempted use with 1seg isdb-t project but not got any parameters. The dongle work well with FM and GSM reception. I need some special atention do make work?

Best Regards

git-artes commented 8 years ago

Hi, We'll be more than glad to help, but you should be more specific on the problem you're having. Did you got gnuradio installed? Did you got gr-isdbt compiled? Does gr-isdbt runs? Do you see the constellation? Do you have trouble obtaining a usable multimedia signal? best Federico

andregcoimbra commented 8 years ago

Hi, Frederico,

Since my question I really improved my tests. I have changed the blocks to work with my dongle and the result are this parameters but the results are inconstant. Follow the prints. best. Andre G. Coimbra

screenshot from 2016-07-01 18-07-16

screenshot from 2016-07-01 18-23-41

git-artes commented 8 years ago

Hi, It looks like you got a really poor SNR. The correlation (in the first picture) should have a much more clear "peak", and you got what looks like the QPSK (what's normally transmitted in a 1-seg signal) but it's really noisy. Try a different antenna, or different position. You should also make sure to configure the rest of the blocks (time deinterleaver and viterbi decoder notably) accordingly (else, the Reed-Solomon decoder will deem the bytes incorrectable and not output anything, thus resulting in a file with 0 byte). best

andregcoimbra commented 8 years ago

Hi, Thanks a lot for your help. Glad your tip I had change the antenna and worked very well. Now I will enjoy the project. Best regards

screenshot from 2016-07-02 14-32-25

git-artes commented 8 years ago

Glad it worked. best