SDRPlay with GQRX

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IW2DHW
Posts: 58
Joined: Wed Sep 23, 2015 7:33 pm

SDRPlay with GQRX

Postby IW2DHW » Mon Oct 19, 2015 4:33 pm

I am using SDRPlay on Linux (Ubuntu 14.04/64 bit) with GQRX and with new CubicSDR supporting it by SoapySDR.

On CubicSDR I use 10.099.800 Hz for Offenbach Meteo Rtty reception. This is correct. Frequency is 10.100.800 and required center frequency is at 1000 Hz audio in USB.
With this program I need a bandwidth of 3000 Hz and better results are with an audio sampling rate of 22050 for interfacing Fldigi by Pulseaudio monitor,

On GQRX I need a 10.10.900 tuning frequency for getting same decoding. And changing frequency on GQRX don't change center audio frequency immediately but only after few steps.

Is this due to different approach to interfacing to SDRPlay?

A screenshot of GQRX is attached
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pa1ap
Posts: 8
Joined: Sat Nov 07, 2015 11:19 pm

Re: SDRPlay with GQRX

Postby pa1ap » Wed Nov 11, 2015 8:13 pm

Hi Can you share the settings you are using? I am using linux and just installed gqrx but I dont know which settings are needed for device.. What is the LO offset etc? Thanks very much! regards, Onno
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IW2DHW
Posts: 58
Joined: Wed Sep 23, 2015 7:33 pm

Re: SDRPlay with GQRX

Postby IW2DHW » Thu Nov 12, 2015 7:11 pm

For device:

Device: SDRPlay RSP
Samplerate = 1.583 Mhz
Bandwidth = 0.04 Mhz
LBN LO = 0

Input controls have checked DC remove and IQ balance

Any other parameter is not critical.

But now I am using CubicSDR.

Regards
Franco Spinelli
IW2DHW
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pa1ap
Posts: 8
Joined: Sat Nov 07, 2015 11:19 pm

Re: SDRPlay with GQRX

Postby pa1ap » Wed Nov 18, 2015 8:38 pm

Hi,

Thanks for sharing the parameters! I am still trying to get sdrplay to run well on linux. So far no real success. Its almost like the sdrplay is clipping the whole time, even when antenna is not connected. I did manage to get something running using gnuradio-companion using an example fm radio code. But even that was not brilliant. Shortwave has not worked yet.

I will keep trying and will share positive results ofcourse :-) CubeSDR install worked but when it detects the sdrplay and I select it my screen freezes and I have to reboot the computer by force. Not sure why that happens.

Regards, Onno de pa1ap
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pa1ap
Posts: 8
Joined: Sat Nov 07, 2015 11:19 pm

Re: SDRPlay with GQRX

Postby pa1ap » Wed Nov 18, 2015 9:11 pm

Hi,

Sorry to continue with questions. If I do SoapySDRUtil --probe I get the following results;

######################################################
## Soapy SDR -- the SDR abstraction library
######################################################

Probe device

----------------------------------------------------
-- Device identification
----------------------------------------------------
driver=null
hardware=null

----------------------------------------------------
-- Peripheral summary
----------------------------------------------------
Channels: 0 Rx, 0 Tx
Timestamps: NO


Do you see other information?

Best regards, Onno de pa1ap
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sdrplay
Posts: 582
Joined: Wed Jan 07, 2015 7:58 am

Re: SDRPlay with GQRX

Postby sdrplay » Thu Nov 19, 2015 10:49 am

Hi

What version of the API installer did you use? There was a permissions issue with the one previous to the latest one. Please check the permissions of the /usr/local/lib/SoapySDR and /usr/local/lib/SoapySDR/modules directory.

If they are not 755 (rwxr-xr-x) then you will have a problem.

If you are still struggling contact us on support@sdrplay.com and we'll try to help you get up and running.

Best regards,

SDRplay Support
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Sasan
Posts: 92
Joined: Sat Jun 27, 2015 1:15 am

Re: SDRPlay with GQRX

Postby Sasan » Mon Dec 21, 2015 9:46 pm

IW2DHW wrote:I am using SDRPlay on Linux (Ubuntu 14.04/64 bit) with GQRX and with new CubicSDR supporting it by SoapySDR.

On CubicSDR I use 10.099.800 Hz for Offenbach Meteo Rtty reception. This is correct. Frequency is 10.100.800 and required center frequency is at 1000 Hz audio in USB.
With this program I need a bandwidth of 3000 Hz and better results are with an audio sampling rate of 22050 for interfacing Fldigi by Pulseaudio monitor,

On GQRX I need a 10.10.900 tuning frequency for getting same decoding. And changing frequency on GQRX don't change center audio frequency immediately but only after few steps.

Is this due to different approach to interfacing to SDRPlay?

A screenshot of GQRX is attached


Hi
Can you please share your Gqrx settings with us?
I've also compiled Gqrx and it detects my SDRPlay, but I can't demodulate any signal.
Any tips and tricks?
Last edited by Sasan on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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IW2DHW
Posts: 58
Joined: Wed Sep 23, 2015 7:33 pm

Re: SDRPlay with GQRX

Postby IW2DHW » Tue Dec 22, 2015 8:54 pm

See my post of 12 November for my GQRX parameters.

Have you compiled GQRX with qmake or with cmake?
For me compiling with qmake give no result. Using cmake produce a working executable of GQRX

Regards

Franco Spinelli
IW2DHW
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Sasan
Posts: 92
Joined: Sat Jun 27, 2015 1:15 am

Re: SDRPlay with GQRX

Postby Sasan » Wed Dec 23, 2015 6:58 am

IW2DHW wrote:See my post of 12 November for my GQRX parameters.

Have you compiled GQRX with qmake or with cmake?
For me compiling with qmake give no result. Using cmake produce a working executable of GQRX

Regards

Franco Spinelli
IW2DHW


Thanks, it compiled but does not demodulate anything!
Here's a screenshot of a local FM station. I can see the spectrum, but can't hear anything (other than hiss)
http://imgur.com/aJAmF4I

I compiled with cmake (used "cmake .. -DCMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.5.1_2/" , then "make")
I also have some glitches once in a while (horizontal lines on the waterfall)
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IW2DHW
Posts: 58
Joined: Wed Sep 23, 2015 7:33 pm

Re: SDRPlay with GQRX

Postby IW2DHW » Wed Dec 23, 2015 6:59 pm

Please move hardware frequency 2 or 3 kHz away from receiving frequency.

What system are you using?

Regards

Franco Spinelli
IW2DHW
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