On 05/09/2023 04:38, Bachmaier, Luca wrote:
Hello Marcus,
Thank you for your detailed explanation. I was able to fix the problem
now: I updated GNU Radio from 3.10.5 (installed over apt) to 3.10.7
(installed from source). With the newer version the FFT block now
correctly displays a noise floor.
So far so good, the FFT resolution is still low as I cannot set the
size higher than 256 (Error “samples per package must not be smaller
than atomic item size”). As far as I understood, the size should be
able to go as high as 2048 when using 10Gbit streaming.
My current configuration should enable that:
-MTU on my interface is set to 9000
-Parameter spp of RFNoC RX Radio is set to 2048
-Current FPGA image is of XG type
In case it’s helpful, here’s the relevant output of `ip a` of my devices:
Host:
4: enp9s0f1np1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq
state UP group default qlen 1000
link/ether 9c:6b:00:16:8e:96 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.3/24 scope global enp9s0f1np1
valid_lft forever preferred_lft forever
USRP:
3: sfp0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc pfifo_fast
qlen 1000
link/ether 00:80:2f:31:28:42 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.2/24 brd 192.168.10.255 scope global sfp0
valid_lft forever preferred_lft forever
I think in the "RFNOC Graph" block, you can specify the SPP in the
"Device Args" parameter.
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