# I can't send signal with frequency beyond sampling rate in GNuRadio

**URL:** <https://www.ruby-forum.com/t/i-cant-send-signal-with-frequency-beyond-sampling-rate-in-gnuradio/262362>\
**Category:** GNU Radio\
**Created:** [January 4, 2022, 6:45am UTC](https://www.ruby-forum.com/t/i-cant-send-signal-with-frequency-beyond-sampling-rate-in-gnuradio/262362 "2022-01-04T06:45:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Aaron922](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/dec6dc/32.png) [@Aaron922](https://www.ruby-forum.com/u/Aaron922)\
**Post date:** [January 4, 2022, 6:45am UTC](https://www.ruby-forum.com/t/i-cant-send-signal-with-frequency-beyond-sampling-rate-in-gnuradio/262362/1 "2022-01-04T06:45:58Z")

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I’m a student working on a FRID project about ASK modulation and demodulation. I use USRP to send and receive but when I used 915MHz sine wave as carrier and set the sampling rate as 64KHz, I found the frequency of the signal I received is no more than 16KHz. And if I use a filter to process the signal, the GnuRadio will give a warning that I should follow the nyquist theorem. However the signal in my system is narraw band. Will someone help me? Thanks!