is there a way to incur a phase shift on one of the streams from the in-built UHD examples? the python API allows has
usrp.send_waveform(samples, duration, center_freq, sample_rate, [0,1],gain) but this sends the same samples to both outputs. I've used this icommand in conjunction with the LO sharing options for the multi_usrp object to confirm the phase between channels i'd like to be able to apply some digital phase shift between the 2 to test the level of control, hence all the gr-uhd questions. any ideas or references? On Wed, Jan 19, 2022 at 9:41 AM Rob Kossler <rkoss...@nd.edu> wrote: > On Wed, Jan 19, 2022 at 1:00 AM Paul Atreides <maud.dib1...@gmail.com> > wrote: > > > > Ok, so just circling back on this. Ive got a decent handle on the Python > API. I’ve confirmed the LO signal comes out of the port once the splitter > output is enabled. > > > > Rob you’re saying that for sure both channels need to be external AND > exported? making the settings: > > TX 0: > > LO source = external > > LO Exported = true > > TX 1: > > LO source = external > > LO Exported = true > Yes, except as you pointed out below, LO Exported for Tx1 is not > needed and likely does nothing. > > > > > Radio #0 TX LO OUT 0 = enabled > > Radio #1 TX LO OUT 1 = enabled (for debug) > > (When I set These they turn on the lights for the LO outs) > > > > The front panel cable should connect TX LO output 0 to TX LO Input 1 > Yes > > > > > Like you said, According to the block diagram, the TX LO input 1 should > connect both channels to the 1x2 splitter so I should only need 1 LO output > turned on. Id like to point out that in the block diagram it also doesn’t > look like it’s possible to export channel 1’s LO. The only connection in > the diagram is internal. > > Yes, Somewhere in the Ettus documentation, it indicates that this is > the case (I've forgotten where). > > > > > Am I missing something? Have you gotten this to work? > Yes, I have been using this in a 16x16 system with 8 N321 devices all > connected by a single LO (arbitrarily chosen LO export channel > distributed to both Tx and Rx LO inputs). I've also tested it on > smaller systems as small as 4x4 (and possibly 2x2 like your case, but > not positive on this). >
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