[USRP-users] N310 Images with external LO

Kai-Uwe Storek kaiuwe.storek at googlemail.com
Wed Feb 13 11:21:52 EST 2019


Dear Robert,

thanks for the quick and helpful reply. Turning off this calibration
feature solves the issue.

Kai


Am Mi., 13. Feb. 2019 um 17:05 Uhr schrieb Robert via USRP-users <
usrp-users at lists.ettus.com>:

> Hi Kai,
>
>
>
> I faced the same issue. Apparently it is linked to the quadrature error
> correction (QEC) and can be solved turning off this calibration. This can
> be done by setting init_cals=BASIC, where you can add the relevant
> calibrations but avoid RX_QEC_INIT, see
> https://files.ettus.com/manual/page_usrp_n3xx.html#n3xx_mg_calibrations.
>
>
>
> Robert
>
>
>
> *From:* USRP-users [mailto:usrp-users-bounces at lists.ettus.com] *On Behalf
> Of *Kai-Uwe Storek via USRP-users
> *Sent:* Wednesday, February 13, 2019 4:53 PM
> *To:* usrp-users at lists.ettus.com
> *Subject:* [USRP-users] N310 Images with external LO
>
>
>
> Hey Folks,
>
>
>
> I'm struggling with the external LO feature of my N310. This issue might
> be related to
> http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2018-April/056233.html
> .
>
>
>
> Setup:
>
> Signal generator outputs a continuous wave at 2.002 GHz (-50dBm) to the
> RX2 of RF0. With internal LO everything is fine (see pic1).
>
>
>
> Problem:
>
> In the next step I use the device argument "rx_lo_source=external" and
> provide a 4 GHz CW with 3 dBm at LO IN 0/1 RX. The spectrum now shows a
> significant image of the input signal. I played around with level of
> external LO without any changes.
>
>
>
> Any ideas?
>
> Thanks in advance! :)
>
>
>
> Kai
>
>
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