qt-dab project with Raspi 3 and Adafruit 3.5" TFT touchscreen

[Spectrumanalyzer]

Dear Jan, Beste Jan,

Many congratulations on your qt-dab project! I integrated a Raspi3 running your Appimage + Adafruit 3.5" TFT touchscreen in my existing self-made audio console. It works like a charm :-)

Just wanted to let you know this.

Groetjes uit België Joris

[phil-audio]

Hello Joris

can you give me a little more precision on your realization. I am really beginner in the middle RPI3 and I would also like to be able to make a DAB + reader with this RPI3. I am from the region of Tournai in Belgium.

Did you compile an image from Rasbian? or have you taken the DT-dab-ARM.appimage 2.0 version?

I have a screen KUMAN 3.5 HDMI Thank you

[Spectrumanalyzer]

Dear Phil,

I indeed used the QT-dab-ARM appimage by Jan Van Katwijk. Don't forget to use 'sudo chmod +x filename' to make it executable and to make sure the drivers for your SDR Dabstick are installed.

hope this helps,

[phil-audio]

Thank you Joris for the information, I will test this, I have never used the file APPimage, to follow, I'll let you know. your audio output comes from the raspberry or did you add a card in addition I have in stock a X400 suptronics Thank you Philippe

[Spectrumanalyzer]

I use the RPI and the quality is very good

rgrds Joris

[Spectrumanalyzer]

RPI- audio I mean..

[JvanKatwijk]

Whow, that really looks nice Thanks

Op zo 17 mrt. 2019 om 12:09 schreef Spectrumanalyzer < notifications@github.com>:

Dear Jan, Beste Jan, [image: QT-touch1] https://user-images.githubusercontent.com/48531093/54489530-86d29300-48ad-11e9-9e9c-d3ccbcb6040f.jpg [image: QT-touch2] https://user-images.githubusercontent.com/48531093/54489532-8b974700-48ad-11e9-8ac7-4a6dff3634bf.jpg

Many congratulations on your qt-dab project! I integrated a Raspi3 running your Appimage + Adafruit 3.5" TFT touchscreen in my existing self-made audio console. It works like a charm :-)

Just wanted to let you know this.

Groetjes uit België Joris

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-- Jan van Katwijk

[ab1jx]

No signals here in the US. That's politics I think.

[Spectrumanalyzer]

From what I read on the internet, there are no DAB transmissions in the US. That's a pity because it works really well. Maybe you can move to Europe :)

[JvanKatwijk]

I am sorry to hear that, if you are interested to see what DAB is, I can send you a link to a recording

Op zo 28 apr. 2019 om 10:55 schreef Spectrumanalyzer < notifications@github.com>:

From what I read on the internet, there are no DAB transmissions in the US. That's a pity because it works really well. Maybe you can move to Europe :)

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-- Jan van Katwijk

[ab1jx]

Yes, it's fairly well documented that it won't work, I just didn't check first. https://en.wikipedia.org/wiki/Digital_radio So we don't have DAB and we don't have DVB-T, guess that just leaves SDR for the dongles.

This sounds very similar to Radio Mondiale https://en.wikipedia.org/wiki/Digital_Radio_Mondiale but over VHF instead of HF. I sort of had that working a few years ago, but if I remember right finding a receiver with enough bandwidth was an issue.

[JvanKatwijk]

While both DAB and DRM use OFDM, there are differences. From an implementers point of view, DRM is more difficult than DAB, DAB frames are separated by a section without any transmitted data, in DRM the frames follow each other directly Furthermore, while DAB data is encoded in a differtial psk style, for DRM, with QAM16 and 64 more work is to be done to reconstruct the original data.

I do not know whether or not there is DRM is the US

best jan

Op zo 28 apr. 2019 om 17:05 schreef ab1jx notifications@github.com:

Yes, it's fairly well documented that it won't work, I just didn't check first. https://en.wikipedia.org/wiki/Digital_radio So we don't have DAB and we don't have DVB-T, guess that just leaves SDR for the dongles.

This sounds very similar to Radio Mondiale https://en.wikipedia.org/wiki/Digital_Radio_Mondiale but over VHF instead of HF. I sort of had that working a few years ago, but if I remember right finding a receiver with enough bandwidth was an issue.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/JvanKatwijk/qt-dab/issues/126#issuecomment-487387561, or mute the thread https://github.com/notifications/unsubscribe-auth/ACCPHQHNQYPQSY4LURUXCNTPSW4MZANCNFSM4G7BIOYA .

-- Jan van Katwijk

[ab1jx]

From https://upload.wikimedia.org/wikipedia/commons/c/c7/United_States_Frequency_Allocations_Chart_2016_-_The_Radio_Spectrum.pdf

As far as I can see we just have IBOC https://en.wikipedia.org/wiki/In-band_on-channel, which is proprietary. The FCC isn't willing to give a slot in the 173 MHz range I think. Frequencies are actually auctioned here, it's quite commercial.

There are a few frequencies in there that are used for remote broadcasting, like if some radio station sends out a news crew to cover a story and they want to report live from the scene, they're apt to be somewhere in there, then that's patched to the main transmitter on a broadcast frequency.

I'm an extra class ham, and I had a 1st class radiotelephone license. Never worked in broadcast, just 2-way like police, fire, taxi. 173 is at the top of the 150 band and a lot of radios can be retuned to go up there.

[andimik]

Have a look at https://github.com/argilo/gr-nrsc5

This is for HD Radio which is used in US.

Not tested from my side, as the only were tests in Romania and Germany.

[ab1jx]

That's transmit (using Gnuradio), https://github.com/theori-io/nrsc5/ is for receive using librtlsdr.