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[Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter


From: Vincenzo Pellegrini
Subject: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
Date: Mon, 27 Oct 2008 13:15:52 +0100

Hi Martin,
thanks for the FTP.

I already have a location online at my father's lawyer's office.

So, there you can find all old posted videos (which won't get removed for the foreseeable future)
and some new, more descriptive ones:

PREFIX= www.legalepellegrini.it/ing/

and then:

Soft-DVB-Karlsruhe.mp4                //the video of the conference we met at
ofdm_RAI_MUXA2.dump                //a training DVB-T OFDM signal for receivers that want "broadcast-level" channel tables.
                                                     allows you to teach the receiver on what pids to look for channels when you send the 
                                                     real signal
                                           
ofdm_40.dump                              //a signal with some content within (if your receiver is smart enough this is the only thing you have
                                                       to send)
@Grandmas.mp4                          //an on the air broadcast with RFX900 at a 30odd meters distance with 5 concrete and brick
                                                      walls within

signals are interleaved short samples (I/Q)  with sampling frequency  8Msps

the receiver must therefore be able to receive a 7 MHz channel
the vast majority of DVBT receivers accept 7 MHz channels in VHF but only a few accept such channels in the UHF spectrum.

I'm actually curious about the receivers that will be used within the demo you described.. I had to search intensively to find receivers capable of such an "oddity" and it turned out that all receivers built for Australian market, actually are.

Any way as soon as Matt will provide the project with the promised sub-1GHz transceiver it will be possible to broadcast DVB-T signals towards almost any existing receiver.

If you wold like signals carrying some other content I can help. But let's first test these signals.
Currently I can prepare a signal with 2 or  3 standard resolution channels or up to 10 hand-held resolution channnels

PS
I decided to make this communication public because it contains a few resources that could even be useful for somebody within the project.

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