[USRP-users] TwinRX RX1 LO1 occasionally at wrong frequency

Sam Reiter sam.reiter at ettus.com
Fri Jan 3 15:36:05 EST 2020


Daniel,

This is tricky. Not only have I never seen this issue, but it sounds like
it happens intermittently for you as well. If this is something you're
still running into, I'd encourage you to email me at support at ettus.com
directly. We can cover some additional troubleshooting and potentially get
these boards sent in examination, if necessary.

Best,

Sam Reiter
Ettus Research

On Thu, Nov 7, 2019 at 12:51 PM Neunteufel, Daniel via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi all,
>
>
>
> I’m using two X310, each with two TwinRX daughterboards, connected to a
> host via two 10Gbit SFP+ links per X310. The host machine runs UHD 3.14.1.1
> using DPDK on ubuntu 18.04.
>
>
> When applying a CW (2.44 GHz) signal at the input of all 8 ports and
> running rx_samples_to_file for all channels, occasionally, the obtained IQ
> data does not contain the applied signal. This happens randomly, in about
> 50 % of the cases, only on the TwinRX RX1 channels and only on three out
> of four TwinRX daughterboards.
>
>
> I tried to debug the problem and it turns out that in those cases the LO1
> of the affected channels cannot be observed at 3.69 GHz as expected, but
> rather around 3.25 GHz.
>
> The UHD API, however, claims that everything is in best order when reading
> back the LO values. Inserting delays after setting the frequency values as
> recommended does not help, either.
> All LO sources are set to "internal".
>
>
> Any ideas what could be the issue here? Thanks!
>
>
> Regards,
> Daniel
>
>
> _______________________________________________
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> USRP-users at lists.ettus.com
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>
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