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 <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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