Re: SABR Micro, DAB+, 3D


Simon Brown
 

First I must write the DAB decoder, then I’ll think about rotating. My local DAB site is Redruth.

 

https://en.wikipedia.org/wiki/Redruth_transmitting_station#Digital_radio_(DAB)

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: 30 June 2021 15:05
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SABR Micro, DAB+, 3D

 

not on a rotator?? fixed on the chimney??

you should make it turnable (put ontop the other yagi) ... or replace it with a bigger longer one only for the dab area (and also on a rotator)

i guess you should get more from it if you can turn it

greetz sigi

Am 30.06.2021 um 14:30 schrieb Simon Brown:

Hi,

 

The antenna is the smaller log periodic.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: 30 June 2021 13:04
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SABR Micro, DAB+, 3D

 

only 8km away ?? then you do not need a big antenna like your lopper (but seems to be a good wideband solution)

a paperclip poked in an rtl dongle should work (for your local receive)

for dab"dx" you need a good vhf yagi for around 200 megs but you sure know that

... while talking about antennas ... is your feed mounted ?!? (pulling your leg a bit)

greetz sigi

Am 30.06.2021 um 13:44 schrieb Simon Brown:

Probably I’ll develop as a plug-in as I have the radio interface available. Once working I could then make it a standalone program but that’s quite a lot of work.

 

One reason for DAB+ is I then have the classes available for future work, also I can listen to Jazz FM (UK) and also play DAB+ when we get good Tropo.

 

Currently using a nice 100 to 600MHz log periodic, am only ~8 km from the transmitter.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: 30 June 2021 12:38
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SABR Micro, DAB+, 3D

 

could you include that in console?? or will it be an extra app like qt dab?!?

Am 30.06.2021 um 13:29 schrieb Simon Brown:

Ah,

 

QT-DAB does work, drives the Airspy correctly. My birthday present from me to me in October will be my own DAB+ receiver app 😊 .

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: 30 June 2021 12:16
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SABR Micro, DAB+, 3D

 

look for qt dab ... soft from jan

https://github.com/JvanKatwijk/qt-dab

lots of hardware included (rtl dongle, sdrplay, lime, pluto etc etc) ... he even works on receive via dab and retransmit on analog fm stereo (if you use a pluto) ... then you can receive your favourite dab station on any normal fm radio in your house (retransmitting not finished yet)

jan is now on holiday but will be back in a few weeks (mid of july?!?)

greetz sigi dg9bfc

Am 30.06.2021 um 10:18 schrieb Simon Brown:

I’m just running the Windows kit, haven’t built it or even looked at the code.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gisle Vanem
Sent: 30 June 2021 07:58
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SABR Micro, DAB+, 3D

 

[Edited Message Follows]

On Wed, Jun 30, 2021 at 08:22 AM, Simon Brown wrote:

Welle.io is not bad but uses a lot of CPU and I don’t think it drives my Airspy R2 correctly.

It depends. If it is built to use FFTW, then yes. The CPU-load in my case is around 17%.
But if I build Welle-IO using Kiss-FFT and compiled using fast-calls (option -Gr), then the CPU drops to only 10%.

Edit: the Airspy problem is proably related to how Welle-IO handles SoapySDR. Not very good IMHO.


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