German DVB-T is 1/4 guard interval since they're using SFN's. In the
flow graph picture that Ahsan sent previously, not all of the blocks are
visible, but the disabled gr-isdbt Ofdm sym acquisition block is
configured incorrectly.
For either OFDM acquisition block, the CP length should be 2048 (8192 /
4) instead of 256.
Ron
On 12/17/2015 04:40 AM, Federico Larroca wrote:
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?
best
Federico
2015-12-17 7:51 GMT-03:00 Ron Economos <[email protected]
<mailto:[email protected]>>:
Marcus,
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.
Ron
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,
Marcus
On 17.12.2015 11:14, [email protected]
<mailto:[email protected]> wrote:
Hello all,
Here are the USRP setting for my flowgraph
USRP N210 Settings
Sampling Rate: 10M
Center Frequency :746MHz
Gain:19
The broadcast station has these parameters
Frequency:746MHz
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
Cheers
Ahsan
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