412 replies to this topic

[Matrix10]

We can use rtl-tcp with dab-cmdline.

If we think that USB of receivers can cause the problem!

The rtl-tcp will run on a computer, where welle.io already works!

 

It's not very elegant solution 

[jpuigs]

The rtl-tcp will run on a computer, where welle.io already works!

 

I commented several days ago, on welle.io there are two gain controls (auto or manual) but on dab-cmdline there is only one gain control (auto or manual).

Won't it be the unknown problem ??

[Matrix10]

Generally speaking, gain and signal reception is not a problem

in all this.

 

The problem is we have two programs

one has poor filtration and cell/radio stations detection

and the other does not play audio for one or other reason.

And the CPU load is very large.

 

The first program works great when it detects all channels (I mean audio dig channels).

But it's worth it when you have to restart it five times ?

[athoik]

Let's exclude that USB port is not an issue.

With -H and -I you can control where rtl_tcp will connect to.

-H hostname (example 2, 3 and 4 only)

If rtl_tcp is selected as input device, the -H option allows selection of a hostname. Default is "127.0.0.1".

-I port (example 2, 3, and 4 only)

If rtl_tcp is selected as input device, the -I option allows selection of a port. Default is 1234.

https://github.com/J...ijk/dab-cmdline

The autogain is completely handled differently in welle.io, maybe it's autogain.

We just need to exclude some options now and focus on the real problem. Is it the autogain? IF so there is a manual autogain too.

Attached Files

•  dab-rtl_tcp-sdgradio_mips.zip   73.18KB   2 downloads
•  dab-rtl_tcp-sdgradio_arm.zip   61.56KB   8 downloads

[jpuigs]

 

Generally speaking, gain and signal reception is not a problem

 

If you don't receive signal, is a really a BIG problem.

 

I asked it because the windows program (welle) has 2 gain controls, I set both to AUTO and the USB works PERFECTLY.

That's all I know.

[athoik]

Generally speaking, gain and signal reception is not a problem

 
If you don't receive signal, is a really a BIG problem.
 
I asked it because the windows program (welle) has 2 gain controls, I set both to AUTO and the USB works PERFECTLY.
That's all I know.

When AGC is on it goes here:

https://github.com/A...TL_SDR.cpp#L305

So what it does, it checks for values going to bottom 0 or to top 255, and automatically recalculates the correct dB gain.

If dab-cmdline author likes to implement this on one of his examples, I can copy it.

PS. Also it uses software only gain, not HW..

    // Always use manual gain, the AGC is implemented in software
    rtlsdr_set_tuner_gain_mode(device, 1);

    // Disable hardware AGC by default
    setHwAgc(false);

    // Enable AGC by default
    setAgc(true);

Edited by athoik, 29 December 2017 - 21:44.

[Matrix10]

 

 

Generally speaking, gain and signal reception is not a problem

 

If you don't receive signal, is a really a BIG problem.

 

I asked it because the windows program (welle) has 2 gain controls, I set both to AUTO and the USB works PERFECTLY.

That's all I know.

 

 

Yes, in my tests, it is different.

 

I have a strong signal.

very stable and accurate frequency.

 

The problem appears in the software itself.

But not in amplification or signal strength.

 

The latest DAB software detects all channels without any problems very fast and sends data streams.

So it is clear that the problem is not a signal.

 

 

The first DAB software has problems with filtering the data channels and it needs very often a lot of time to scan this.

 

 

Edited by Matrix10, 29 December 2017 - 21:46.

[bzoli72]

Hi!

 

Is it possible to receive DAB radios from the astra satellite by some means?

(23.5E 12641V + 12645V)

[athoik]

Hi!
 
Is it possible to receive DAB radios from the astra satellite by some means?
(23.5E 12641V + 12645V)

Maybe by using ts2na: https://github.com/p...eti-tools#ts2na

[athoik]

Please also have a look here: https://github.com/A...mment-314188029

Welle.io is also looking to integrate the sdrdab!

So till now we have:

1. dab-cmdline

a. problems with signal (maybe software autogain will solve it)
b. problems with scanning (scanning is slow, results are not consistent)
c. problems with encoding on characters (author is aware ticket #27)

2. dablin+dab2eti

a. problems with signal (jpuigs)
b. high cpu usage


3. sdrdab

a. it crashes here...

sdrdab-cli --help
Usage: sdrdab-cli [OPTION...]
  or:  sdrdab-cli [OPTION...] -l        list available devices
  or:  sdrdab-cli [OPTION...] [-t[TUNER_NO=0]]  use n-th tuner
  or:  sdrdab-cli [OPTION...] --open-file=FILENAME      read samples from FILENAME
  or:  sdrdab-cli [OPTION...]
            --resampling_mode=nearest/linear/pchip/spline       choose specified
            resampling mode
  or:  sdrdab-cli [OPTION...]
            --convolutional=viterbi/spiral/hard choose algorithm to decode
  or:  sdrdab-cli [OPTION...]  [-s] -o OUTPUT   save audio to OUPUT
Exemplary application of sdrdab

 Core radio options:
  -c, --channel=CHANN        Optionally start decoding specified channel
                             instead of the first one. This requires a number,
                             not name
  -f, --frequency=FREQ       Carrier frequency in kHz. Default value: 229072
                             (DAB+ in Krakow)

 Input options:
      --file-type=FILETYPE   Use FILETYPE={int8, uint8, int16, uint16, float,
                             double, raw} to define how read samples from file,
                             raw==uint8
  -l, --list-devices         Lists all available supported tuners and exits
      --open-file=FILENAME   Use FILENAME as input source
  -t, --open-tuner[=TUNER_NO]   Use n-th available tuner as input source (by
                             default first tuner is used)

 Output options:
  -g, --graphic=GRAPHIC      Save SlideShow images in GRAPHIC directory
  -i, --detailed-info        Print verbosely channel information every time
                             ENTER is pressed
  -o, --output=OUTPUT        Save audio to OUTPUT file
  -r, --no-rds               Don't display current channel RDS
  -s, --silent               Don't play on speakers (applicable in conjunction
                             with -o switch)

 Algorithm options:
      --convolutional=CONVOLUTIONAL
                             Decoding algorithms: CONVOLUTIONAL={viterbi,
                             spiral, hard}. Default is viterbi, spiral and hard
                             are not yet supported
      --resampling=TYPE      Use TYPE={nearest, linear, pchip, spline}. Only
                             when read samples from file, pchip and spline are
                             not yet supported, default is linear

 Informative options:
  -?, --help                 Give this help list
      --open-file=FILENAME   Use FILENAME as input source
      --usage                Give a short usage message
  -v, --verbose              Verbose
  -V, --version              Print program version

Attached Files

•  sdrdab-cli.arm.zip   787.49KB   5 downloads
•  libsamplerate0_0.1.8-r1_mips32el.ipk   1.28MB   2 downloads
•  libsamplerate0_0.1.8-r1_armv7ahf-neon.ipk   1.28MB   4 downloads
•  sdrdab-cli.mips.zip   788.77KB   2 downloads

[Matrix10]

The main question (I have no answer ) is why dab-cmdline

loses SNR when searching/scan DAB band.

Specifically if we can trust the log

The SNR for the station that you sometimes find is SNR 14 or 16 (depending on antenna and gain in cmd line )

and when dab-cmdline searching/scan DAB band falling to SNR from zero to say 5 (with my installation)

 

If the Log is correct

this explains unstable and slow work

because with so bad SNR  dab-cmdline does not find all the information and channels .

 

so it looks like automatic and manual gain do not work when scanning

and it works when the channel is active.

Edited by Matrix10, 30 December 2017 - 00:47.

[babsy98]

i have buy now this

 

[Matrix10]

i have buy now this

 

 

 

I have the same one + Up converter for HF amateur radio.

Edited by Matrix10, 30 December 2017 - 16:37.

[dolphs]

hi meanwhile my rtl-sdr.com dongle arrived, however can one please inform (pm) where to obtain a converter to connect eg. a sv9323 antenna to receive DAB+ as well DVB-T2? cheers

Edited by dolphs, 3 January 2018 - 04:01.

[Rob van der Does]

If you search the web for 'MCX Antenna Adapter Connector' you'll find lots of them.

[Matrix10]

@athoik 

 

I see some changes to dab cmd line

 this may be a fix problem with low snr (DAB band search) RTL SDR ??

 

https://github.com/J...ijk/dab-cmdline

[dolphs]

Hi,

 

 

If you search the web for 'MCX Antenna Adapter Connector' you'll find lots of them.

 

 

Thanks for your response ordered meanwhile an adaptor but have to wait another 2-3 weeks.

[Tech]

I cutted the original cable and mounted a connector to it.

[Matrix10]

In China, the cables and adapters are cheap

but if you only need one you can buy it here too.

.....allekabels.nl/netwerk/sma-kabels.html

If you have a nearby GSM/LTE company , many such cables are used in GSM/LTE base stations.

Edited by Matrix10, 3 January 2018 - 14:47.

[Rob van der Does]

I cutted the original cable and mounted a connector to it.

Yep, that would have been my choice if I hadn't been able to find them ready made.