Re: [Discuss-gnuradio] DVB-T/T2
Short update: I was able to transmit my own stream now, audio stuttered a bit, but for sure I will find out how to fix this. It was a short iPhone video of a snake in front of our office (we do not have so much snakes here in Germany), and it was fun seeing this transmitted via DVB-T :) Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 5:13 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralf, having Us when moving the mouse does not looks good. Can you show a picture taken with htop (on Linux). the coding is a setting of the transmitter and receiver and it just need to be the same on both. It does impact the maximum bitrate of the stream as in the table. Look into the 4.5.4 and 4.5.5 chapters. It says that reference information is sent at boosted power level with imaginary equal zero. This is what you see in the two dots on left and right. Bogdan On Wednesday, April 8, 2015 5:34 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx mailto:ra...@schmid.xxx wrote: Hi, The Us are when I do something else with the machine. They do not show when I keep my fingers off the mouse, so no reason to worry, it runs for ages without a single U when the machine is kept alone. I already found out about the rate. The coding also needs to be reflected by the transport stream, or just regarding the bitrate? I did not find a setting for that, but I will look deeper into it during the next days, when I find some time. My first test trying to set identical settings like from the working test stream brought just a black picture. Another question...when looking into the constellation, what are the two dot clouds on the X/I-axis, outside the expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement. As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below). If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A. Schmid, dk5ras ra...@schmid.xxx mailto:ra...@schmid.xxx wrote: Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net mailto:w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04
Re: [Discuss-gnuradio] DVB-T/T2
), and it was fun seeing this transmitted via DVB-T :) Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 5:13 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralf, having Us when moving the mouse does not looks good. Can you show a picture taken with htop (on Linux). the coding is a setting of the transmitter and receiver and it just need to be the same on both. It does impact the maximum bitrate of the stream as in the table. Look into the 4.5.4 and 4.5.5 chapters. It says that reference information is sent at boosted power level with imaginary equal zero. This is what you see in the two dots on left and right. Bogdan On Wednesday, April 8, 2015 5:34 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Hi, The Us are when I do something else with the machine. They do not show when I keep my fingers off the mouse, so no reason to worry, it runs for ages without a single U when the machine is kept alone. I already found out about the rate. The coding also needs to be reflected by the transport stream, or just regarding the bitrate? I did not find a setting for that, but I will look deeper into it during the next days, when I find some time. My first test trying to set identical settings like from the working test stream brought just a black picture. Another question...when looking into the constellation, what are the two dot clouds on the X/I-axis, outside the expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement. As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below). If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. RonOn 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters? Thanks,Bogdan On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing
Re: [Discuss-gnuradio] DVB-T/T2
Hey guys, why does digital video need its own standard? On Thu, Apr 9, 2015 at 7:45 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Short update: I was able to transmit my own stream now, audio stuttered a bit, but for sure I will find out how to fix this. It was a short iPhone video of a snake in front of our office (we do not have so much snakes here in Germany), and it was fun seeing this transmitted via DVB-T :) Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 5:13 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralf, having Us when moving the mouse does not looks good. Can you show a picture taken with htop (on Linux). the coding is a setting of the transmitter and receiver and it just need to be the same on both. It does impact the maximum bitrate of the stream as in the table. Look into the 4.5.4 and 4.5.5 chapters. It says that reference information is sent at boosted power level with imaginary equal zero. This is what you see in the two dots on left and right. Bogdan On Wednesday, April 8, 2015 5:34 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Hi, The Us are when I do something else with the machine. They do not show when I keep my fingers off the mouse, so no reason to worry, it runs for ages without a single U when the machine is kept alone. I already found out about the rate. The coding also needs to be reflected by the transport stream, or just regarding the bitrate? I did not find a setting for that, but I will look deeper into it during the next days, when I find some time. My first test trying to set identical settings like from the working test stream brought just a black picture. Another question...when looking into the constellation, what are the two dot clouds on the X/I-axis, outside the expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement. As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below). If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have
Re: [Discuss-gnuradio] DVB-T/T2
Ok, it would be useful to have receivers too like for the DVB-T.
Bogdan
On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net wrote:
Only transmitter implementations for now. They are here:
https://github.com/drmpeg/gr-dvbs2
https://github.com/drmpeg/gr-dvbt2
The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction
and MISO processing.
Ron
On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote:
Hi Ron,
I have not followed the development of DVB-T2/S2 lately. Are there receiver
implementations for the T2/S2 or just transmitters?
Thanks,
Bogdan
On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras
ra...@schmid.xxx wrote:
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div.yiv5839327111WordSection1 {}#yiv5839327111Great to hear that you work
finds its way into the official thing! At the moment, as the RF stuff
works, I am trying to learn about all this crazy video file stuff, for being
able to create transport streams with my own content. Up to now I am still
testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will
not decode the audio, while the DVB tester decodes audio just fine. Ralph.
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Re: [Discuss-gnuradio] DVB-T/T2
Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net mailto:w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters? Thanks, Bogdan On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras mailto:ra...@schmid.xxx ra...@schmid.xxx wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Hi, Don't be worried by the Us, I am running the whole thing in a virtual machine that lives on a Windows tablet PC, so it is normal that Linux stutters a bit when Windows claims its rights. I just must not touch Windows, and everything is fine. OK, so I just need to set the correct bitrate, and the stream should run. Great. Can I keep frame rate as it is from the original video? And what do the stream ID fields for video and audio mean? My version of the specs does not have the mentioned chapters, but I have already guessed something like this. It just made me curious because the constellation plots in the specs do not show this. Ah, here, the stuff linked in Wikipedia is what you referred to. My documents seem newer, but different. tr_101190v010302p.pdf and ts_102831v010201p.pdf Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 17:13 To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralf, having Us when moving the mouse does not looks good. Can you show a picture taken with htop (on Linux). the coding is a setting of the transmitter and receiver and it just need to be the same on both. It does impact the maximum bitrate of the stream as in the table. Look into the 4.5.4 and 4.5.5 chapters. It says that reference information is sent at boosted power level with imaginary equal zero. This is what you see in the two dots on left and right. Bogdan On Wednesday, April 8, 2015 5:34 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Hi, The Us are when I do something else with the machine. They do not show when I keep my fingers off the mouse, so no reason to worry, it runs for ages without a single U when the machine is kept alone. I already found out about the rate. The coding also needs to be reflected by the transport stream, or just regarding the bitrate? I did not find a setting for that, but I will look deeper into it during the next days, when I find some time. My first test trying to set identical settings like from the working test stream brought just a black picture. Another question...when looking into the constellation, what are the two dot clouds on the X/I-axis, outside the expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement. As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below). If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan
Re: [Discuss-gnuradio] DVB-T/T2
to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. RonOn 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters? Thanks,Bogdan On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
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div.yiv2904105420WordSection1 {}#yiv2904105420 Hi, The Us are when I do
something else with the machine. They do not show when I keep my fingers off
the mouse, so no reason to worry, it runs for ages without a single U when the
machine is kept alone.
I already found out about the rate. The coding also needs to be reflected by
the transport stream, or just regarding the bitrate? I did not find a setting
for that, but I will look deeper into it during the next days, when I find some
time. My first test trying to set identical settings like from the working test
stream brought just a black picture. Another question...when looking into the
constellation, what are the two dot clouds on the X/I-axis, outside the
expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the
DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu
[mailto:b_diacone...@yahoo.com]
Sent: Wednesday, April 8, 2015 2:57 PM
To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's
on the command line which means the whole flowgraph do not provide data to USRP
at the right speed. It basically mean the computer cannot cope with the
required processing requirement. As for the video parameters, in the DVB-T
specs
(http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf)
you will find Table 17 where the rates are presented. FYI, the settings you
have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval
1/32. The video should be constant bit rate but it is not a hard requirement
(see below). If you just broadcast video from a file and not plan to use a
live streaming from camera, the rate should not matter too much. The video is
sent at the rate of the DVB-T according to it's parameters and with RTL2832
receiver it is buffered and played at the correct speed (at least for short
files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A.
Schmid, dk5ras ra...@schmid.xxx wrote: Yep, this would be quite useful!
Bogdan, as you are here, too - I don't know very much about all the crazy video
file stuff, but maybe you can give me some basic parameters I need to comply
with for a transport stream, to be able to transmit it with your package?! I
need to use Windows for the conversion, as my Linux installation is only on a
virtual machine, with limited space and power. A capable looking Windows
program is available, but there are so many options I have no clue about :( I
modified your flow graph according to Rons hints, and now I have a stable and
reliable DVB-T transmission path with your package. See
http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210,
and for reception a second PC with DVB-T stick, or a DVB-x tester that does
them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding
those DVB-x packages! Ralph. From:
discuss-gnuradio-bounces+ralph=schmid@gnu.org
[mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan
Diaconescu
Sent: Wednesday, April 8, 2015 8:01 AM
To: Ron Economos; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have
receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM,
Ron Economos w...@comcast.net wrote: Only transmitter implementations for
now. They are here:
https://github.com/drmpeg/gr-dvbs2
https://github.com/drmpeg/gr-dvbt2
The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and
MISO processing.
RonOn 04/07/2015 06:38 AM, Bogdan Diaconescu wrote:
Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there
receiver implementations for the T2/S2 or just transmitters? Thanks,Bogdan On
Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid
Re: [Discuss-gnuradio] DVB-T/T2
Hi, The Us are when I do something else with the machine. They do not show when I keep my fingers off the mouse, so no reason to worry, it runs for ages without a single U when the machine is kept alone. I already found out about the rate. The coding also needs to be reflected by the transport stream, or just regarding the bitrate? I did not find a setting for that, but I will look deeper into it during the next days, when I find some time. My first test trying to set identical settings like from the working test stream brought just a black picture. Another question...when looking into the constellation, what are the two dot clouds on the X/I-axis, outside the expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu [mailto:b_diacone...@yahoo.com] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement. As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below). If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, Ralph A. Schmid, dk5ras ra...@schmid.xxx mailto:ra...@schmid.xxx wrote: Yep, this would be quite useful! Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :( I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding those DVB-x packages! Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Bogdan Diaconescu Sent: Wednesday, April 8, 2015 8:01 AM To: Ron Economos; discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM, Ron Economos w...@comcast.net mailto:w...@comcast.net wrote: Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters? Thanks, Bogdan On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras mailto:ra...@schmid.xxx ra...@schmid.xxx wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
The test clips have AC3 audio. AC3 is not used much at all in Europe because broadcasters have to pay an extra licensing fee to Dolby to transmit it. It looks like DVBViewer does not come with an AC3 decoder, but you can add one. http://www.dvbviewer.com/en/index.php/index.php?page=manualchapter=jsub=j2 Ron On 04/07/2015 12:09 AM, Ralph A. Schmid, dk5ras wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ron Economos Sent: Tuesday, April 7, 2015 8:14 AM To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Yes, rotated constellations are a new feature of DVB-T2. More reading here. http://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_1028 31v010201p.pdf See section 9.2.3. In addition to the rotation, the I and Q components of a QAM/QPSK symbol are cyclically delayed. Since there's a time and a frequency interleaver after the modulator, the I and Q components of a symbol get sent at a different time and a different frequency (OFDM carrier). Almost all DVB-T2 broadcasters turn this feature on, even with 256QAM. All DVB-T2 receivers must support rotated constellations. Be sure to change the Constellation rotation parameter in both the Modulator block and the Frame Mapper block, or the receiver will get confused. BTW, both the DVB-T2 and DVB-S2 transmitters will be included in GNU Radio in the next release (3.7.7) as part of gr-dtv. If you place a Scope Sink after the modulator, you can see the virtual constellation mentioned in the link above. Ron On 04/06/2015 10:14 PM, Ralph A. Schmid, dk5ras wrote: It _is_ intended: http://dcis2009.unizar.es/FILES/CR2/p41.pdf So forget about my question :) Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 07:04 To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hmm, now I see, there is an option constellation rotation in the modulator block. Maybe this is not an accident, but wanted behavior?! I will check this evening... Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Yes, rotated constellations are a new feature of DVB-T2. More reading here. http://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_102831v010201p.pdf See section 9.2.3. In addition to the rotation, the I and Q components of a QAM/QPSK symbol are cyclically delayed. Since there's a time and a frequency interleaver after the modulator, the I and Q components of a symbol get sent at a different time and a different frequency (OFDM carrier). Almost all DVB-T2 broadcasters turn this feature on, even with 256QAM. All DVB-T2 receivers must support rotated constellations. Be sure to change the Constellation rotation parameter in *both* the Modulator block and the Frame Mapper block, or the receiver will get confused. BTW, both the DVB-T2 and DVB-S2 transmitters will be included in GNU Radio in the next release (3.7.7) as part of gr-dtv. If you place a Scope Sink after the modulator, you can see the virtual constellation mentioned in the link above. Virtual 16QAM Ron On 04/06/2015 10:14 PM, Ralph A. Schmid, dk5ras wrote: It _is_ intended: http://dcis2009.unizar.es/FILES/CR2/p41.pdf So forget about my question :) Ralph. *From:*discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] *On Behalf Of *Ralph A. Schmid, dk5ras *Sent:* Tuesday, April 7, 2015 07:04 *To:* discuss-gnuradio@gnu.org *Subject:* Re: [Discuss-gnuradio] DVB-T/T2 Hmm, now I see, there is an option constellation rotation in the modulator block. Maybe this is not an accident, but wanted behavior?! I will check this evening... Ralph. *From:*discuss-gnuradio-bounces+ralph=schmid@gnu.org mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] *On Behalf Of *Ralph A. Schmid, dk5ras *Sent:* Tuesday, April 7, 2015 06:39 *To:* discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org *Subject:* [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Hi Ron,
I have not followed the development of DVB-T2/S2 lately. Are there receiver
implementations for the T2/S2 or just transmitters?
Thanks,
Bogdan
On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras
ra...@schmid.xxx wrote:
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div.yiv0268530338WordSection1 {}#yiv0268530338 Great to hear that you work
finds its way into the official thing! At the moment, as the RF stuff works,
I am trying to learn about all this crazy video file stuff, for being able to
create transport streams with my own content. Up to now I am still testing with
the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode
the audio, while the DVB tester decodes audio just fine. Ralph. From:
discuss-gnuradio-bounces+ralph=schmid@gnu.org
[mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ron
Economos
Sent: Tuesday, April 7, 2015 8:14 AM
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Yes, rotated constellations are a new
feature of DVB-T2. More reading here.
http://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_102831v010201p.pdf
See section 9.2.3. In addition to the rotation, the I and Q components of a
QAM/QPSK symbol are cyclically delayed. Since there's a time and a frequency
interleaver after the modulator, the I and Q components of a symbol get sent at
a different time and a different frequency (OFDM carrier). Almost all DVB-T2
broadcasters turn this feature on, even with 256QAM. All DVB-T2 receivers must
support rotated constellations.
Be sure to change the Constellation rotation parameter in both the Modulator
block and the Frame Mapper block, or the receiver will get confused.
BTW, both the DVB-T2 and DVB-S2 transmitters will be included in GNU Radio in
the next release (3.7.7) as part of gr-dtv.
If you place a Scope Sink after the modulator, you can see the virtual
constellation mentioned in the link above.
RonOn 04/06/2015 10:14 PM, Ralph A. Schmid, dk5ras wrote:
It _is_ intended: http://dcis2009.unizar.es/FILES/CR2/p41.pdf So forget about
my question :) Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org
[mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph
A. Schmid, dk5ras
Sent: Tuesday, April 7, 2015 07:04
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hmm, now I see, there is an option
constellation rotation in the modulator block. Maybe this is not an accident,
but wanted behavior?! I will check this evening...
Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org
[mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph
A. Schmid, dk5ras
Sent: Tuesday, April 7, 2015 06:39
To: discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2
flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is
somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2
constellation is phase shifted. I have no real world T2 signals to compare, but
at least the tester shows normal constellation views when looking at S and T
signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/
The flowgraphs are almost original, just adopted to the USRP B210, and I
Re: [Discuss-gnuradio] DVB-T/T2
The DVB-T2 transmitter repository is here: https://github.com/drmpeg/gr-dvbt2 In the README, there are links to test transport streams for a few representative flow graphs. gr-dvbt2 is also part of pybombs. Ron On 04/07/2015 08:02 AM, g.roel...@telenet.be wrote: Hi, Can someone share the files used? So we can reproduce the work? *Van: *Ron Economos w...@comcast.net *Aan: *discuss-gnuradio@gnu.org *Verzonden: *Dinsdag 7 april 2015 08:14:22 *Onderwerp: *Re: [Discuss-gnuradio] DVB-T/T2 Yes, rotated constellations are a new feature of DVB-T2. More reading here. http://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_102831v010201p.pdf See section 9.2.3. In addition to the rotation, the I and Q components of a QAM/QPSK symbol are cyclically delayed. Since there's a time and a frequency interleaver after the modulator, the I and Q components of a symbol get sent at a different time and a different frequency (OFDM carrier). Almost all DVB-T2 broadcasters turn this feature on, even with 256QAM. All DVB-T2 receivers must support rotated constellations. Be sure to change the Constellation rotation parameter in *both* the Modulator block and the Frame Mapper block, or the receiver will get confused. BTW, both the DVB-T2 and DVB-S2 transmitters will be included in GNU Radio in the next release (3.7.7) as part of gr-dtv. If you place a Scope Sink after the modulator, you can see the virtual constellation mentioned in the link above. Virtual 16QAM Ron On 04/06/2015 10:14 PM, Ralph A. Schmid, dk5ras wrote: It _is_ intended: http://dcis2009.unizar.es/FILES/CR2/p41.pdf So forget about my question :) Ralph. *From:*discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] *On Behalf Of *Ralph A. Schmid, dk5ras *Sent:* Tuesday, April 7, 2015 07:04 *To:* discuss-gnuradio@gnu.org *Subject:* Re: [Discuss-gnuradio] DVB-T/T2 Hmm, now I see, there is an option constellation rotation in the modulator block. Maybe this is not an accident, but wanted behavior?! I will check this evening... Ralph. *From:*discuss-gnuradio-bounces+ralph=schmid@gnu.org mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] *On Behalf Of *Ralph A. Schmid, dk5ras *Sent:* Tuesday, April 7, 2015 06:39 *To:* discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org *Subject:* [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Only transmitter implementations for now. They are here: https://github.com/drmpeg/gr-dvbs2 https://github.com/drmpeg/gr-dvbt2 The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote: Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters? Thanks, Bogdan On Tuesday, April 7, 2015 1:32 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxx wrote: Great to hear that you work finds its way into the official thing! At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine. Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] DVB-T/T2
Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
Hmm, now I see, there is an option constellation rotation in the modulator block. Maybe this is not an accident, but wanted behavior?! I will check this evening... Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] DVB-T/T2
It _is_ intended: http://dcis2009.unizar.es/FILES/CR2/p41.pdf So forget about my question :) Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 07:04 To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hmm, now I see, there is an option constellation rotation in the modulator block. Maybe this is not an accident, but wanted behavior?! I will check this evening... Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] DVB-T/T2 Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase shifted. I have no real world T2 signals to compare, but at least the tester shows normal constellation views when looking at S and T signals off the air. This is how things look: http://dk5ras.dyndns.org/tmp/DVB/ The flowgraphs are almost original, just adopted to the USRP B210, and I added channel slider... Any ideas what I could tweak? Ralph. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
