SDRplay RSPDuo and GNU Radio

[Andrew Thornett]

Today, we've managed to get RSPDuo working under GNU Radio for Windows (I am using Windows 10). I am very thankful to David Hardwick, without whom this could not have been achieved. The two of us spent 3 hours chewing away at the problem until at last we saw success.....and I am still suffering a rip-roaring migraine following the mental exercise involved!

Andy

[Stephen Arbogast]

Dr. Andrew,

I am  curious  .. what   were the  problems   that  you had  and how did  you  solve  them? 

I  am  finally  making   progress  using  Pierre Terrier's GSR...    https://github.com/Radio-Source/GSR         As  Marcus   Leech  warned/instructed  in his BAA Seminar   about   small values  of   alpha  for   the   single pole  IIR  filtering in   GNU  Radio   I  found   that   by  increasing   the  split-ratio  to  1000    my  plots  of  Total Power (daily)  are  much  smoother.  I  think I was having  the  usual problems  of  numerical  methods  causing inaccuracy  working  with very small  numbers  with 32  bits.

I need  to  make more  observations  to  be  sure  using  both  RTL-SDR   and  AirSpy R2.

Stephen

[Andrew Thornett]

Hi Stephen,

We had terrible problems getting the system to acknowledge the existence of the RSP Duo using the SoapySDRplay module in GNU Radio and getting the bespoke SDRplay module to work at all. We never managed to get the SoapySDRplay module to work with RSP Duo but after lot of work got the bespoke SDRplay.module working.

Andy

Sent from Outlook for Android

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From: 'Stephen Arbogast' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Thursday, October 2, 2025 3:31:07 AM
To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: [SARA] Re: SDRplay RSPDuo and GNU Radio

 

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[Stephen Arbogast]

Andrew ,  

I am running   on  Ubuntu,    no problems  with  drivers for  soapy  rtl    and soapy  air spy  My  problem  was  my   understanding  of  split_ratio  in  Marcus   Leeche's  software.. which     Pierre Terrier adopted      Turns  out   that     there is  a  problem with  32 bit    arithmetic  in  GNU  radio.  When  the    alpha  value  in a single pole  IIR filter   is  too  low    errors  occur.....     I am  running  tests  ...  with   split  ratio  set   to 1000. So  far  good   results.    

[Stephen Arbogast]

The  split  ratio is    how much   the   total  power  should be  integrated   vs  how much   it   should  be filtered  as I understand it.............