On 12/09/2019 03:11 PM, Lukas Haase wrote:
No, I only have one RX channel at the moment.
--> One TX @ f and one RX @ 2f.
The phase relation between this TX+RX should stay constant/coherent once both
TX+RX tune to a different f and back.
Let me know if the setup is clear, otherwise I'll try to draw a block
diagram/equations or I can also send the GRC screenshots.
Thanks,
Luke
You code shows two RX channels:
now = self.uhd_usrp_sink_0.get_time_now()
self.uhd_usrp_sink_0.set_command_time(now + uhd.time_spec(1))
self.uhd_usrp_source_0.set_command_time(now + uhd.time_spec(1))
self.uhd_usrp_source_0.set_center_freq(2*self.fcenter, 0)
self.uhd_usrp_source_0.set_center_freq(2*self.fcenter, 1)
self.uhd_usrp_sink_0.set_center_freq(self.fcenter, 0)
self.uhd_usrp_source_0.clear_command_time()
self.uhd_usrp_sink_0.clear_command_time()
So, you're measuring the phase-offset between the TX side and the RX
side at the 2nd harmonic, and expecting that phase relationship to be
the same across re-tunes? I'm not sure that's possible.
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