Sneha,
You did not present the configuration page of the UHD USRP block.
In any case, whenever a complaint refers to a frequency not being at or below
half the sample rate, it means that the system thinks that you are attempting
to either transmit or receive a signal at a frequency that is not below the
Nyquist rate. The Nyquist rate is half the sampling frequency.
Huh?
It is a fundamental law in digital signal processing that to either transmit or
receive a pure tone intact (i.e. not shifting to/from baseband), the sampling
rate must meet or exceed twice the frequency of the signal.
* Aaron
From: Discuss-gnuradio <discuss-gnuradio-bounces+achesir=mitre....@gnu.org> On
Behalf Of Sneha vasan
Sent: Wednesday, June 5, 2019 10:34 AM
To: discuss-gnuradio@gnu.org
Subject: [EXT] [Discuss-gnuradio] Filter error
Hi everyone,
Can anybody guide me on this???.. I am using x310 with sampling rate of 1MHz.
Traceback (most recent call last):
File "/home/sneha/My_waveform/past work/transmit.py", line 414, in <module>
main()
File "/home/sneha/My_waveform/past work/transmit.py", line 402, in main
tb = top_block_cls()
File "/home/sneha/My_waveform/past work/transmit.py", line 250, in __init__
callback=lambda ok, payload: self.digital_ofdm_demod_0.recv_pkt(ok,
payload),
File "/usr/local/lib/python2.7/dist-packages/gnuradio/digital/ofdm.py", line
223, in __init__
options.log)
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/digital/ofdm_receiver.py",
line 78, in __init__
filter.firdes.WIN_HAMMING) # filter type
File "/usr/local/lib/python2.7/dist-packages/gnuradio/filter/filter_swig.py",
line 143, in low_pass
return _filter_swig.firdes_low_pass(*args, **kwargs)
RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2
Regards,
Sneha
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