On 10/25/2018 05:24 AM, Anabel Almodovar via USRP-users wrote:
Hello,
I would like to know how local oscillators work when they are in
COMPANION mode.
I'm working with an x310 and my intention is that channel 0 exports
its LO to the rest of the channels and to itself. In this way the
signal from all the LOs go the same way.
When I configure the x310 so that the CH0 exports its LO at the same
time that it is as external I get the following error.
/*
*/
/*Actual RX Bandwidth: 100.000000 MHz...
Setting LO source...
Unexpected Standard exception from MEX file.
What() is:ValueError: Cannot export an external LO for channel 0
..
*/
This is my code:
/*std::string lo_src = "companion", lo_src1 = "internal", lo_src2 =
"external";
std::cout << boost::format("Setting LO source...") << std::endl <<
std::endl;
usrp->set_rx_lo_export_enabled(true ,uhd::usrp::multi_usrp::ALL_LOS,
0); //habilitar la exportacion de LO
usrp->set_rx_lo_source(lo_src2, uhd::usrp::multi_usrp::ALL_LOS, 0);
usrp->set_rx_lo_source(lo_src2, uhd::usrp::multi_usrp::ALL_LOS, 1);*/
When I use the companion mode in the CH0 instead of external I don't
get any error. However, I don't know exactly how LOs work internally.
I would appreciate if someone could explain me how the companion mode
works.
Regards,
Anabel Almodóvar
The gr-doa application does just this with TwinRX cards--
https://github.com/EttusResearch/gr-doa
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