Ralph, I'm not able to access either of the .grc files on your website, but using the original dvbt_tx_demo_8k flow graph from gr-dvbt, the spectrum I generate with 003.008.003-RC1 has a 3dB bandwidth of about ~7.5MHz the same as your uhd_master screen shot. I don't see the truncated bandwidth of your uhd_rc1 screenshot. http://ianbuckley.net/dvbt.jpg Can you verify please that you have UHD at the current 003.008.003-RC1 tag position git hash 2fe319d9790c7ec0bcdb9582c4fea95f3fd809b9, and that the downloaded FPGA images are from: http://files.ettus.com/binaries/images/uhd-images_003.008.003-rc1.zip
I'll need your exact flow graph if I'm to debug this anymore. -Ian On Apr 17, 2015, at 11:48 AM, "Ralph A. Schmid, dk5ras" <[email protected]> wrote: > I have put it all here, flow graphs and screenshots of the flow graphs: > > http://dk5ras.dyndns.org/tmp/DVB/ > > This way we can keep it on the list without sending attachments. > > They were taken from the VM container before all the upgrades were made, but > I did not change anything when upgrading. > > Ralph. > > > > -----Original Message----- > From: Ian Buckley [mailto:[email protected]] > Sent: Friday, April 17, 2015 19:25 > To: Ralph A. Schmid, dk5ras > Cc: 'Martin Braun'; [email protected]; 'GNU Radio Discussion List' > Subject: Re: [Discuss-gnuradio] New UHD seems to break a lot... > > Great Ralph, thats a big help. Can you send me your exact flow graph used to > generate these 2 plots off list please. I want to re run this scenario and > see your exact configuration. > > Thanks > -Ian > > On Apr 17, 2015, at 10:00 AM, "Ralph A. Schmid, dk5ras" <[email protected]> > wrote: > >> OK, here we go. The hotel TV was dvb-c only, so I had to do the tests >> back at home. >> >> I took my perfectly working Kubuntu 14.04 64 bit VM container together >> with my B210, made a copy and updated this one, first I made a git >> pull to get latest master, built it, rebuilt gnuradio, rebuilt >> gr-dvbt, updated the FPGA images, and everything still was fine. The > chosen dvb-t bandwidth is 8 MHz. >> >> Then I changed to 003_008_003_rc1, did the same procedure, fired up >> grc, and the signal was not decodable both with a dvb-t PC receiver >> and with an dvb-x analyzer. The analyzer saw the RF level, but no >> data, no constellation, nothing, it looked to him like interference. >> >> When you have a look at the two "uhd" screenshots here >> http://dk5ras.dyndns.org/tmp/DVB/ made with my spectrum analyzer then >> you will find that RC1 produces a somehow narrower signal, so it >> really looks something gets cut at the ends with all the filtering and DSP > stuff. >> Adjusting the channel bandwidth in the uhd sink block from 0 to a >> sensible value changes nothing. >> >> Btw., the dvb-t2 package behaves identical. >> >> Ralph. >> >> >> -----Original Message----- >> From: Martin Braun [mailto:[email protected]] >> Sent: Wednesday, April 15, 2015 21:14 >> To: Ralph A. Schmid, dk5ras; [email protected]; 'GNU Radio >> Discussion List' >> Subject: Re: [Discuss-gnuradio] New UHD seems to break a lot... >> >> master works, but RC1 does not? Huh, I'm confused now. Can you give >> some detail on what's going on, so we can try and reproduce this? >> >> Thanks, >> Martin >> >> On 15.04.2015 12:52, Ralph A. Schmid, dk5ras wrote: >>> RC1, master seems to work. >>> >>> Ralph. >>> >>> -----Original Message----- >>> From: Martin Braun [mailto:[email protected]] >>> Sent: Wednesday, April 15, 2015 15:44 >>> To: Ralph A. Schmid, dk5ras; [email protected]; 'GNU Radio >>> Discussion List' >>> Subject: Re: [Discuss-gnuradio] New UHD seems to break a lot... >>> >>> Thanks, Ralph. Just to clarify: When you say 'New UHD', do you mean >>> 3.8.3-RC1, or latest master? >>> >>> Martin >>> >>> On 15.04.2015 08:40, Ralph A. Schmid, dk5ras wrote: >>>> It is a B210, but as a note, due to the up to now missing FPGA >>>> images I used 003.008.003-RC1, not the latest master. Still I had no >>>> access to a spectrum and DVB-T analyzer, so I have no idea what is >>>> happening, I just can confirm that RF is transmitted, and the >>>> receiver doesn't get a picture, while with the snapshot of the same >>>> VM before the upgrade >>> is received without problems. >>>> I will know more in about three hours. >>>> >>>> Ralph. >>>> >>>>> -----Original Message----- >>>>> From: Martin Braun [mailto:[email protected]] >>>>> Sent: Wednesday, April 15, 2015 3:15 PM >>>>> To: Ralph A. Schmid, dk5ras; [email protected]; 'GNU Radio >>>>> Discussion List' >>>>> Subject: Re: [Discuss-gnuradio] New UHD seems to break a lot... >>>>> >>>>> On 15.04.2015 06:20, Ralph A. Schmid, dk5ras wrote: >>>>>> Hi, >>>>>> >>>>>> Not only OpenBTS is affected, also gr-dvbt/t2 do not work any more >>>>>> with latest uhd. A quick check during lunch break showed, the >>>>>> produced output is not decodable any more. I will take a closer >>>>>> look this evening at home, where I have more and better equipment. >>>>> >>>>> Ralph, >>>>> >>>>> which device is this on? >>>>> >>>>> Thanks, >>>>> Martin >>>> >>> >>> >> >> > >
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