rspduo in diversity mode (mode 2)

[bob-uk]

I am working to get the rspduo working in mode 2 (diversity) feeding into gnu radio via the soapy interface. I have modified Streaming.cpp (probably inelegantly due to rusty c++!) to get both channels back to gnu radio (locally and remote). It appears to be working but the data doesn't appear to be synchronised, I think because the phase difference between the two channels varies considerably over short time spans. Modified Streaming.cpp attached, please no laughter😉. My soapy module in gnu radio is configured for 2 channels and sdrplay with a config line of "remote=192.168.0.10:1234,driver=remote,rspduo_mode=2". Any ideas about the data synchronisation? Thanks Bob
Streaming.cpp.zip

[fventuri]

Bob,
thanks for your input.

Since you say you use GNU Radio to connect to the SDRplay RSPduo, I am wondering if you looked into the GNU Radio OOT module for the SDRplay RSPs:

• for GNU Radio version 3.7, the OOT module can be found here: https://github.com/fventuri/gr-sdrplay/tree/API3+RSPduo (note the branch name 'API3+RSPduo')
• for GNU Radio version 3.9 (and above), please see here: https://github.com/fventuri/gr-sdrplay3

I am not familiar with your use case, but using the OOT modules (instead of passing through the SoapySDR interface first, and then the SoapySDRPlay driver) might help with your issue.

Franco

[bob-uk]

Franco
Thanks for getting back to me.
I have made progress (I think) with the SoapySDRPlay code and revised files attached. I think I still have a problem between rx_callback and receiveStream but it is mainly in sync.
SoapySDRPlay.zip

On the issue of the gr-sdrplay OOT modules, I hadn't clocked their import so am looking at them now. As I said I have gr 3.8 loaded and running so have built 3.9 and installed it to a diffefent location, hopefully they won't trample on each other. I am running on mac Catalina and have some problems compiling gr-sdrplay3, both with clang and gcc/g++

in rsp_impl.h this construct fails "const double (&get_freq_range() const override)[2];" with a compiler error requesting a ')' before the override?
and then it is failing deep in the Xcode includes
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:1547:38: error:
implicit instantiation of undefined template
'std::__1::hash<sdrplay_api_ReasonForUpdateT>'
: public integral_constant<bool, __is_empty(_Tp)> {};

so a bit stuck on this route at present

Bob

[bob-uk]

Sorry Franco, my bad didn't mean to close this, I am a novice in github

[fventuri]

Bob,
I'll look at your changes to SoapySDRPlay tomorrow morning.
As per the issues compiling the GNU Radio OOT module gr-sdrplay3, I created a new issue here: fventuri/gr-sdrplay3#1 (see my answer there).

Franco