Re: [USRP-users] Re: N321 LO sharing between RF 0/1

[Paul Atreides]

Posting on both GNURadio and USRP lists here, since my application overlaps both gr-uhd/GNURadio and the UHD API.

The top-level question is, can gr-uhd support all the necessary N321-specific commands necessary to export the TX LO from RF0 to RF1? That would include running the command to set the 1x4 splitter. That's the one in question.

get_device()->get_tree()->access<bool>("mboards/0/dboards/A/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_0/export").set(true)

If not, Marcus suggested using a python snippet. I've used that with RFNoC before, but how would that work?

I'm guessing it would be an "after-init" and then call the python API for the above (if that command is supported)?

Thanks

On Fri, Jan 14, 2022 at 5:32 PM Marcus D. Leech <patchvonbraun@gmail.com> wrote:

On 2022-01-14 17:30, Rob Kossler wrote:

These thare the UHD commands. I don't know how these translate to gnuradio.

% set both LO sources to use external

set_tx_lo_source(“external”, “lo1”, 0)

set_tx_lo_source(“external”, “lo1”, 1)

% export the internal LO to the 1:4 splitter

set_tx_lo_export_enabled(true, “lo1”, 0)

% enable the 1:4 splitter output port

get_device()->get_tree()->access<bool>("mboards/0/dboards/A/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_0/export").set(true)

I don't think the current GR code has support for controlling the splitter, so a "code snippet" would likely be required.

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