On 09/23/2019 12:04 PM, Markus Roman via USRP-users wrote:
Hi,
Let's consider two simple test configurations using both channels of a
USRPX310 SDR*,* and developed in GNU Radio:
1.SDRs in TX mode: generate a cosine signal, transmit with SDRs and
visualize their phase offset on an O-scope and
2.SDRs in RX mode: SDRs receive a signal from a signal generator and
display their phase offset on a computer.
In the 1^st configuration the phase offsets between channels are
consistent even if we power off the SDR. However, in the 2^nd
configuration, each time when the GNU Radio script is restarted, the
phase difference is changing. I wonder what could cause the issue,
specifically what determines re-tuning in the GNU Radio script. Can
this issue be corrected?
Thank you.
Regards
Markus
You haven't stated which daughter-cards you're using.
In order to have zero phase-offset, you need to use timed commands,
typically, and Gnu Radio/GRC has no direct provision for
that so you have to edit the code.
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