[USRP-users] [Discuss-gnuradio] New UHD seems to break a lot...
Ralph A. Schmid, dk5ras
ralph at schmid.xxx
Fri Apr 17 13:00:39 EDT 2015
OK, here we go. The hotel TV was dvb-c only, so I had to do the tests back
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.
From: Martin Braun [mailto:martin.braun at ettus.com]
Sent: Wednesday, April 15, 2015 21:14
To: Ralph A. Schmid, dk5ras; usrp-users at lists.ettus.com; 'GNU Radio
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?
On 15.04.2015 12:52, Ralph A. Schmid, dk5ras wrote:
> RC1, master seems to work.
> -----Original Message-----
> From: Martin Braun [mailto:martin.braun at ettus.com]
> Sent: Wednesday, April 15, 2015 15:44
> To: Ralph A. Schmid, dk5ras; usrp-users at lists.ettus.com; '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?
> 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.
>>> -----Original Message-----
>>> From: Martin Braun [mailto:martin.braun at ettus.com]
>>> Sent: Wednesday, April 15, 2015 3:15 PM
>>> To: Ralph A. Schmid, dk5ras; usrp-users at lists.ettus.com; '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:
>>>> 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.
>>> which device is this on?
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