Uhd_fft and benchmark_tx

GNU Radio
1

when i run uhd_fft it runs ok but parallel i cannot run benchmark
so i must close the uhd_fft to run the benchmark_tx

as message appears that RuntimeError: LookupError: KeyError: No devices
found for ----->
Empty Device Address
although while searching i find video running both togothers. so how can
i do this to see transmitted signal at certain frequency from the
benchmark transmitted

2

when i run uhd_fft it runs ok but parallel i cannot run benchmark
so i must close the uhd_fft to run the benchmark_tx

as message appears that RuntimeError: LookupError: KeyError: No devices
found for ----->
Empty Device Address
although while searching i find video running both togothers. so how can i
do this to see transmitted signal at certain frequency from the benchmark
transmitted

Hi,

a USRP device can only be accessed by one process at a time. So when you
run uhd_fft this process occupies your USRP. When starting benchmark_tx
the UHD lib looks for other available USRPs and trhows LookupError
because
it can not find any unused USRP device (I assume you only have one USRP
device connected?) unless you stop uhd_fft before (in which case your
USRP
is available again)

Yours
Martin