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Re: [Discuss-gnuradio] DVB-T Reception Problem

From: Federico Larroca
Subject: Re: [Discuss-gnuradio] DVB-T Reception Problem
Date: Thu, 17 Dec 2015 10:40:56 -0200

Hi Ahsan,
The signal does look good indeed. I'm guessing the problem is that nothing is output from the OFDM sym acquisition blocks (both from gr-dvbt and gr-isdbt?). In any case, are you sure about those transmission parameters? Did you check other CP lengths? gr-isdbt includes a small grc file to check both the transmission mode and CP which works both for ISDB-T and DVB-T (examples/obtaining_parameters.grc, please refer to the README or the issues section on the git). Maybe you could test that?

2015-12-17 7:51 GMT-03:00 Ron Economos <address@hidden>:

That extremely low signal level is due to a Multiply Const block in the flow graph set to 0.00055242272. In the gr-dtv in-tree version, I've deleted that block.


On 12/17/2015 02:25 AM, Marcus Müller wrote:
Can you crank up the USRP gain further? An average PSD value of 10^-14 indicates there's still room for amplification, maybe. What Daughterboard are you using?
Just out of interest, because improvised a ~760MHz monopole antenna not so long ago: What kind of antenna are you using?

Best regards,

On 17.12.2015 11:14, address@hidden wrote:
Hello all,
Here are the USRP setting for my flowgraph
USRP N210 Settings
Sampling Rate: 10M
Center Frequency :746MHz
The broadcast station has these parameters
Code rate : 2/3
Guard interval  : 1/4
Transmission mode : 8k
I tried the vector to stream trick but doesnt works. Also I tried using
the OFDM synchronization block from gr-isdbt it also doesnt works. The
signal capture according to me is very good I have its screenshot
attached. Any other tips to get the flowgraph running? Thanks all

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