ok. is that just setting up 2 streamers to start at the same time? On Fri, Jan 21, 2022 at 4:50 PM Marcus D. Leech <[email protected]> wrote:
> On 2022-01-21 16:46, Paul Atreides wrote: > > 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? > > You'll probably have to send samples yourself, with phase-offsets between > the two sample streams. > > > > On Wed, Jan 19, 2022 at 9:41 AM Rob Kossler <[email protected]> wrote: > >> On Wed, Jan 19, 2022 at 1:00 AM Paul Atreides <[email protected]> >> 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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