Hi All, I am trying to measure the phase difference of a received signal between the two RX ports of the B210. (In the grc I simply ran each of the two received signals through an FFT, took the bin with highest amplitude and extracted it's phase, and finaly - subtracted the two).
I experimented with a single signal source generator split in two. I first connected both RX ports with matching wires and received zero phase difference as expected. Though when I added a wire of some length to one of the ports, the received phase difference was NOT as expected by theory. (In short, I sent 100[Mhz] pure sine wave, thus wavelength of 3[m] or shorter, the extra wire was 0.508[cm] long, thus I would expect a phase diff of about 60 deg or more. Frankly I received a phase diff of about 18 deg). What am I doing wrong? I thought maybe the phase calculation of gnuradio is done on the baseband frequency and not on the RF, and therefore the phase diff would be different. Is this my problem? (e.g. if the baseband is only 30[Mhz], then expected phase diff would be 18 deg). If that is the case - how can I know which baseband frequency the AD9361 has chosen? Thank you all for your time, Steve
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