USRP N210 - No device found

GNU Radio
1

Hello everyone,

I am using USRP for the first time. I am trying to replicate the FM
Receiver
found on Ettus’ YouTube channel named as: “How To Build an FM Receiver
with
the USRP in Less Than 10 Minutes”. The .grc flow is generated ok, but
when I
execute the flow graph I get the message:

RuntimeError: LookupError: KeyError: No devices found for ----->
Device Address:
addr: 192.168.10.2

At the beginning I just connected the USRP to the laptop, the Ethernet
was
set as address 192.168.10.2 (mask 255.255.255.0 and gateway 0.0.0.0) and
I
left blank the “Device Address” on the “UHD: USRP Source” and I got the
message:

RuntimeError: LookupError: KeyError: No devices found for ----->
Empty Device Address

I checked that my laptop is able to ping the device using ping
192.168.10.2
on the terminal. Then I changed the “Device Address” to
“addr=192.168.10.2”
and got the message showed at the beggining

RuntimeError: LookupError: KeyError: No devices found for ----->
Device Address:
addr: 192.168.10.2

As my laptop is able to connect to the USRP I guess the problems comes
from
how I set the “UHD: USRP Source” block or the GNU Radio itself. I am
working on Ubuntu 14.04 (installed it today) and GNU Radio Companion
3.7.2.1.

Am I missing something?.
Thanks in advance for your help.

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2

Hello Harold:

Make sure that UHD can see the USRP. Try running “uhd_usrp_probe” with
no
command-line arguments.

Do you have a firewall running on your system? You can check with “sudo
iptables -L”. If you are running one, then try shutting it down, and
re-running your flowgraph.

You can safely shut down your firewall with the following commands:
sudo iptables -P INPUT ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -F

–Neel

3

Hello everyone

The problem was that the IP address set for the PC (192.168.10.2) was
the
same as the USRP, so the communication was not possible. I set the PC
address as 192.168.10.1 and it worked properly (255.255.255.0 mask).

Thanks to Neel and Marcus for their valuable help.

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4

Hi guys, can you help me on this as well. I am using n210 usrp as well with srsRAN. But when i run the command with srsenb it says no rf device found