On 07/22/2020 05:12 AM, Pavlos Basaras via USRP-users wrote:
Hello,
i am a newbie to this so i would appreciate all help and pointers for
reading/understanding what i should (please excuse possibly newbie
questions, thanks!).
I have configured 2 usrp n310 devices, following the instructions
from: https://kb.ettus.com/USRP_N300/N310/N320/N321_Getting_Started_Guide
I am connected to both over all available ports eth0/sfp0/sfp1, and
both "usrp_find_devices" and "uhd_usrp_probe" seem to be working properly.
I would like to proceed with some real testing
(https://kb.ettus.com/Verifying_the_Operation_of_the_USRP_Using_UHD_and_GNU_Radio).
Q1: which TX ports should be secured with RF terminators? Assuming
that we use e.g., only RF 0, all TX ports in the remaining RF1-3
should be terminated, correct? As we are not currently using any other
port from the
front panel (e.g., gps, ref in, trig out, pps ), should these also be
terminated? What about the daughterboard ports?
Q2: the loopback configuration refers to using one usrp to test
TX/RX, correct?. So the setup for this testing is a single usrp, and
focusing on e.g., only on RF 0, by using sma-m to sma-m cable with
30dB attenuator to start testing?
all the best,
Pavlos.
Putting terminators on unused ports is good laboratory "hygiene" but not
strictly necessary.
Placing 30-40dB "inline" in a loopback connection (direct connect
between RX and TX) is mandatory, to prevent possible damage to the receiver.
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