[USRP-users] N310 Images with external LO

Kai-Uwe Storek kaiuwe.storek at googlemail.com
Wed Feb 13 10:53:20 EST 2019


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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