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[Discuss-gnuradio] gr-atsc related question

From: Sahoo, Anirudha
Subject: [Discuss-gnuradio] gr-atsc related question
Date: Fri, 14 Sep 2012 17:41:14 -0400


  I am new to gnu radio/usrp. I am trying out digitial

TV application gr-atsc. I have a USRP N210 with a

basic omnidirectional antenna.

  I checked local digital TV stations and found (from Internet) that

there is one at 603.25 MHz (UHF channel 36) and the station is

listed to be about 14 miles from here. When I run

uhd_fft to receive the channel, I do not see any signal.

I used a hardware oscilloscope to scan the UHF band, but could

not find signal anywhere. Could it be because I do not have a

good antenna (I have only basic omnidirectional antenna which

looks like a 0.75 foot rod; sorry I do not have much communication

engg background).

  Now, even without any TV signal, should the gr-atsc application

Work? It is ok if it shows me a black screen from the mpeg file.

  But when I run the five python scripts (interp_short.py, xlate.py etc.),

The mpeg file generated is of zero size. So I modified the python scripts

to write to file (instead of fifo). What I found was that after runnin

“btl-fsd-py”, its output file is of size zero (other scripts before it generate

file of huge size).  What is the problem here?




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