# Dvb-t/t2 **URL:** \ **Category:** GNU Radio\ **Created:** [April 7, 2015, 6:41am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428 "2015-04-07T06:41:10Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [April 7, 2015, 6:41am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/1 "2015-04-07T06:41:10Z")
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/](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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 7:05am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/2 "2015-04-07T07:05:59Z")
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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: removed\_email\_address@domain.invalid 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/](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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 7:16am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/3 "2015-04-07T07:16:40Z")
It _is_ intended: [http://dcis2009.unizar.es/FILES/CR2/p41.pdf](http://dcis2009.unizar.es/FILES/CR2/p41.pdf) So forget about my question 🙂 Ralph. From: discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 07:04 To: removed\_email\_address@domain.invalid 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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: removed\_email\_address@domain.invalid 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/](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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 9:11am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/4 "2015-04-07T09:11:26Z")
* * * Discuss-gnuradio mailing list removed\_email\_address@domain.invalid [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 8:16am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/5 "2015-04-07T08:16:10Z")
Yes, rotated constellations are a new feature of DVB-T2. More reading here. > **[ts\_102831v010201p.pdf](https://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_102831v010201p.pdf)** > > 3.94 MB 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 ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 9:35am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/6 "2015-04-07T09:35:47Z")
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. > **[DVB viewer - your software for TV and Radio - Manual](http://www.dvbviewer.com/en/index.php/index.php?page=manual&chapter=j&sub=j2)** > > DVBViewer is a DVB Software and allows TV and Radio on your PC! It supports DVB-T(2),S(2),C(2), ATSC and IPTV. Ron ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 3:40pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/7 "2015-04-07T15:40:26Z")
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" ``` [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: #yiv0268530338 #yiv0268530338 – \_filtered #yiv0268530338 {panose-1:2 4 5 3 5 4 6 3 2 4;} \_filtered #yiv0268530338 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} \_filtered #yiv0268530338 {panose-1:2 11 5 2 4 2 4 2 2 3;} \_filtered #yiv0268530338 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv0268530338 #yiv0268530338 p.yiv0268530338MsoNormal, #yiv0268530338 li.yiv0268530338MsoNormal, #yiv0268530338 div.yiv0268530338MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv0268530338 a:link, #yiv0268530338 span.yiv0268530338MsoHyperlink {color:blue;text-decoration:underline;}#yiv0268530338 a:visited, #yiv0268530338 span.yiv0268530338MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0268530338 p.yiv0268530338MsoAcetate, #yiv0268530338 li.yiv0268530338MsoAcetate, #yiv0268530338 div.yiv0268530338MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;color:black;}#yiv0268530338 span.yiv0268530338SprechblasentextZchn {color:black;}#yiv0268530338 span.yiv0268530338E-MailFormatvorlage19 {color:windowtext;}#yiv0268530338 span.yiv0268530338E-MailFormatvorlage20 {color:#1F497D;}#yiv0268530338 p.yiv0268530338BalloonText, #yiv0268530338 li.yiv0268530338BalloonText, #yiv0268530338 div.yiv0268530338BalloonText {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv0268530338 span.yiv0268530338BalloonTextChar {}#yiv0268530338 span.yiv0268530338E-MailFormatvorlage23 {color:#1F497D;}#yiv0268530338 span.yiv0268530338E-MailFormatvorlage24 {color:#1F497D;}#yiv0268530338 .yiv0268530338MsoChpDefault {font-size:10.0pt;} \_filtered #yiv0268530338 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0268530338 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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ron E. Sent: Tuesday, April 7, 2015 8:14 AM To: removed\_email\_address@domain.invalid Subject: Re: [Discuss-gnuradio] DVB-T/T2 Yes, rotated constellations are a new feature of DVB-T2. More reading here. > **[ts\_102831v010201p.pdf](https://www.etsi.org/deliver/etsi_ts/102800_102899/102831/01.02.01_60/ts_102831v010201p.pdf)** > > 3.94 MB 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](http://dcis2009.unizar.es/FILES/CR2/p41.pdf) So forget about my question 🙂 Ralph. From: discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 07:04 To: removed\_email\_address@domain.invalid 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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Ralph A. Schmid, dk5ras Sent: Tuesday, April 7, 2015 06:39 To: removed\_email\_address@domain.invalid 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/](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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 8:02am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/8 "2015-04-08T08:02:38Z")
Ok, it would be useful to have receivers too like for the DVB-T. Bogdan ``` On Tuesday, April 7, 2015 11:23 PM, Ron E. ``` wrote: Only transmitter implementations for now. They are here: [GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2) [GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](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 D. 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" ``` [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: #yiv5839327111 – filtered {panose-1:2 4 5 3 5 4 6 3 2 4;}#yiv5839327111 filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv5839327111 filtered {panose-1:2 11 5 2 4 2 4 2 2 3;}#yiv5839327111 filtered {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv5839327111 p.yiv5839327111MsoNormal, #yiv5839327111 li.yiv5839327111MsoNormal, #yiv5839327111 div.yiv5839327111MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv5839327111 a:link, #yiv5839327111 span.yiv5839327111MsoHyperlink {color:blue;text-decoration:underline;}#yiv5839327111 a:visited, #yiv5839327111 span.yiv5839327111MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv5839327111 p.yiv5839327111MsoAcetate, #yiv5839327111 li.yiv5839327111MsoAcetate, #yiv5839327111 div.yiv5839327111MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;color:black;}#yiv5839327111 span.yiv5839327111SprechblasentextZchn {color:black;}#yiv5839327111 span.yiv5839327111E-MailFormatvorlage19 {color:windowtext;}#yiv5839327111 span.yiv5839327111E-MailFormatvorlage20 {color:#1F497D;}#yiv5839327111 p.yiv5839327111BalloonText, #yiv5839327111 li.yiv5839327111BalloonText, #yiv5839327111 div.yiv5839327111BalloonText {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv5839327111 span.yiv5839327111BalloonTextChar {}#yiv5839327111 span.yiv5839327111E-MailFormatvorlage23 {color:#1F497D;}#yiv5839327111 span.yiv5839327111E-MailFormatvorlage24 {color:#1F497D;}#yiv5839327111 .yiv5839327111MsoChpDefault {font-size:10.0pt;}#yiv5839327111 filtered {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv5839327111 div.yiv5839327111WordSection1 {}#yiv5839327111 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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 7, 2015, 10:24pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/9 "2015-04-07T22:24:58Z")
Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 10:57am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/10 "2015-04-08T10:57:55Z")
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/](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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid 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 E. \ wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan D. 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:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 3:41pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/11 "2015-04-08T15:41:20Z")
The DVB-T2 transmitter repository is here: > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. In the README, there are links to test transport streams for a few representative flow graphs. gr-dvbt2 is also part of pybombs. Ron ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 2:58pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/12 "2015-04-08T14:58:38Z")
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](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" ``` [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: #yiv3233999861 #yiv3233999861 – \_filtered #yiv3233999861 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} \_filtered #yiv3233999861 {panose-1:2 4 5 3 5 4 6 3 2 4;} \_filtered #yiv3233999861 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv3233999861 #yiv3233999861 p.yiv3233999861MsoNormal, #yiv3233999861 li.yiv3233999861MsoNormal, #yiv3233999861 div.yiv3233999861MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv3233999861 a:link, #yiv3233999861 span.yiv3233999861MsoHyperlink {color:blue;text-decoration:underline;}#yiv3233999861 a:visited, #yiv3233999861 span.yiv3233999861MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv3233999861 p.yiv3233999861msonormal, #yiv3233999861 li.yiv3233999861msonormal, #yiv3233999861 div.yiv3233999861msonormal {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv3233999861 p.yiv3233999861msoacetate, #yiv3233999861 li.yiv3233999861msoacetate, #yiv3233999861 div.yiv3233999861msoacetate {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv3233999861 p.yiv3233999861balloontext, #yiv3233999861 li.yiv3233999861balloontext, #yiv3233999861 div.yiv3233999861balloontext {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv3233999861 p.yiv3233999861msochpdefault, #yiv3233999861 li.yiv3233999861msochpdefault, #yiv3233999861 div.yiv3233999861msochpdefault {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv3233999861 span.yiv3233999861msohyperlink {}#yiv3233999861 span.yiv3233999861msohyperlinkfollowed {}#yiv3233999861 span.yiv3233999861sprechblasentextzchn {}#yiv3233999861 span.yiv3233999861e-mailformatvorlage19 {}#yiv3233999861 span.yiv3233999861e-mailformatvorlage20 {}#yiv3233999861 span.yiv3233999861e-mailformatvorlage23 {}#yiv3233999861 span.yiv3233999861e-mailformatvorlage24 {}#yiv3233999861 p.yiv3233999861msonormal1, #yiv3233999861 li.yiv3233999861msonormal1, #yiv3233999861 div.yiv3233999861msonormal1 {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv3233999861 span.yiv3233999861msohyperlink1 {color:blue;text-decoration:underline;}#yiv3233999861 span.yiv3233999861msohyperlinkfollowed1 {color:purple;text-decoration:underline;}#yiv3233999861 p.yiv3233999861msoacetate1, #yiv3233999861 li.yiv3233999861msoacetate1, #yiv3233999861 div.yiv3233999861msoacetate1 {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;color:black;}#yiv3233999861 span.yiv3233999861sprechblasentextzchn1 {color:black;}#yiv3233999861 span.yiv3233999861e-mailformatvorlage191 {color:windowtext;}#yiv3233999861 span.yiv3233999861e-mailformatvorlage201 {color:#1F497D;}#yiv3233999861 p.yiv3233999861balloontext1, #yiv3233999861 li.yiv3233999861balloontext1, #yiv3233999861 div.yiv3233999861balloontext1 {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;color:black;}#yiv3233999861 span.yiv3233999861e-mailformatvorlage231 {color:#1F497D;}#yiv3233999861 span.yiv3233999861e-mailformatvorlage241 {color:#1F497D;}#yiv3233999861 p.yiv3233999861msochpdefault1, #yiv3233999861 li.yiv3233999861msochpdefault1, #yiv3233999861 div.yiv3233999861msochpdefault1 {margin-right:0cm;margin-left:0cm;font-size:10.0pt;}#yiv3233999861 span.yiv3233999861E-MailFormatvorlage39 {color:#1F497D;}#yiv3233999861 .yiv3233999861MsoChpDefault {font-size:10.0pt;} \_filtered #yiv3233999861 {margin:70.85pt 70.85pt 2.0cm 70.85pt;}#yiv3233999861 div.yiv3233999861WordSection1 {}#yiv3233999861 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/](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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid 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 E. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. RonOn 04/07/2015 06:38 AM, Bogdan D. 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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 removed\_email\_address@domain.invalid [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 4:35pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/13 "2015-04-08T16:35:57Z")
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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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](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” \ 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/](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=removed\_email\_address@domain.invalid [mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid) [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 E. \ wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan D. 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:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 5:15pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/14 "2015-04-08T17:15:20Z")
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" ``` [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: #yiv2904105420 #yiv2904105420 – \_filtered #yiv2904105420 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} \_filtered #yiv2904105420 {panose-1:2 4 5 3 5 4 6 3 2 4;} \_filtered #yiv2904105420 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv2904105420 #yiv2904105420 p.yiv2904105420MsoNormal, #yiv2904105420 li.yiv2904105420MsoNormal, #yiv2904105420 div.yiv2904105420MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv2904105420 a:link, #yiv2904105420 span.yiv2904105420MsoHyperlink {color:blue;text-decoration:underline;}#yiv2904105420 a:visited, #yiv2904105420 span.yiv2904105420MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv2904105420 p.yiv2904105420msonormal, #yiv2904105420 li.yiv2904105420msonormal, #yiv2904105420 div.yiv2904105420msonormal {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv2904105420 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span.yiv2904105420e-mailformatvorlage2311 {color:#1F497D;}#yiv2904105420 span.yiv2904105420e-mailformatvorlage2411 {color:#1F497D;}#yiv2904105420 p.yiv2904105420msochpdefault11, #yiv2904105420 li.yiv2904105420msochpdefault11, #yiv2904105420 div.yiv2904105420msochpdefault11 {margin-right:0cm;margin-left:0cm;font-size:10.0pt;}#yiv2904105420 span.yiv2904105420e-mailformatvorlage391 {color:#1F497D;}#yiv2904105420 span.yiv2904105420E-MailFormatvorlage54 {color:#1F497D;}#yiv2904105420 .yiv2904105420MsoChpDefault {font-size:10.0pt;} \_filtered #yiv2904105420 {margin:70.85pt 70.85pt 2.0cm 70.85pt;}#yiv2904105420 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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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](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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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/](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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid 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 E. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. RonOn 04/07/2015 06:38 AM, Bogdan D. 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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 removed\_email\_address@domain.invalid [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 8, 2015, 5:48pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/15 "2015-04-08T17:48:55Z")
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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 17:13 To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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](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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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/](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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid 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 E. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan D. 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:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 9, 2015, 11:49am UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/16 "2015-04-09T11:49:56Z")
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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 5:13 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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” \ 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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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](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” \ 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/](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=removed\_email\_address@domain.invalid [mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid) [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 E. \ wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. Ron On 04/07/2015 06:38 AM, Bogdan D. 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:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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. ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 9, 2015, 1:06pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/17 "2015-04-09T13:06:01Z")
Hey guys, why does digital video need its own standard? On Thu, Apr 9, 2015 at 7:45 PM, Ralph A. Schmid, dk5ras ---
**Author:** ![Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Ralph\_ASSchmidS\_dk](https://www.ruby-forum.com/u/Ralph_ASSchmidS_dk)\ **Post date:** [April 9, 2015, 2:03pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428/18 "2015-04-09T14:03:53Z")
Ralph, good to hear that you were able to stream with DVB-T. BTW, Clayton used DVB-T to stream video for several miles and he put it on his blog: [Digital amateur TV on 70cm, 33cm and 23cm](http://www.irrational.net/2014/03/02/digital-atv/) You may find it useful. Bogdan ``` On Thursday, April 9, 2015 12:46 PM, "Ralph A. 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span.yiv0015152668e-mailformatvorlage24111 {color:#1F497D;}#yiv0015152668 p.yiv0015152668msochpdefault111, #yiv0015152668 li.yiv0015152668msochpdefault111, #yiv0015152668 div.yiv0015152668msochpdefault111 {margin-right:0cm;margin-left:0cm;font-size:10.0pt;}#yiv0015152668 span.yiv0015152668e-mailformatvorlage3911 {color:#1F497D;}#yiv0015152668 span.yiv0015152668e-mailformatvorlage541 {color:#1F497D;}#yiv0015152668 span.yiv0015152668E-MailFormatvorlage78 {color:#1F497D;}#yiv0015152668 .yiv0015152668MsoChpDefault {font-size:10.0pt;} \_filtered #yiv0015152668 {margin:70.85pt 70.85pt 2.0cm 70.85pt;}#yiv0015152668 div.yiv0015152668WordSection1 {}#yiv0015152668 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:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 5:13 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 D. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Wednesday, April 8, 2015 2:57 PM To: Ralph A. Schmid, dk5ras; ‘Ron E.’; removed\_email\_address@domain.invalid 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](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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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/](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=removed\_email\_address@domain.invalid [[mailto:discuss-gnuradio-bounces+ralph=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+ralph=removed_email_address@domain.invalid)] On Behalf Of Bogdan D. Sent: Wednesday, April 8, 2015 8:01 AM To: Ron E.; removed\_email\_address@domain.invalid 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 E. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Only transmitter implementations for now. They are here: > **[GitHub - drmpeg/gr-dvbs2: A DVB-S2 and DVB-S2X transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbs2)** > > A DVB-S2 and DVB-S2X transmitter for GNU Radio. Contribute to drmpeg/gr-dvbs2 development by creating an account on GitHub. > **[GitHub - drmpeg/gr-dvbt2: A DVB-T2 transmitter for GNU Radio](https://github.com/drmpeg/gr-dvbt2)** > > A DVB-T2 transmitter for GNU Radio. Contribute to drmpeg/gr-dvbt2 development by creating an account on GitHub. The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing. RonOn 04/07/2015 06:38 AM, Bogdan D. 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” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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 removed\_email\_address@domain.invalid [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)