# Sample rate in GRC

**URL:** <https://www.ruby-forum.com/t/sample-rate-in-grc/241103>\
**Category:** GNU Radio\
**Created:** [May 13, 2014, 11:06am UTC](https://www.ruby-forum.com/t/sample-rate-in-grc/241103 "2014-05-13T11:06:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 13, 2014, 11:06am UTC](https://www.ruby-forum.com/t/sample-rate-in-grc/241103/1 "2014-05-13T11:06:30Z")

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I am confused about the sample rate in GRC…if i am RXing a signal by  
USRP  
B210 at 2.4 GHz then the sample rate should be 4.8GHz??But USRP B210  
uses a  
direct conversion RX and shifts the signal to 0Hz,so what should be the  
criteria for setting the sample rate?  
Another option could be ton set it double the channel  
bandwidth??i.e.(56\*2)MHz

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [May 13, 2014, 11:13am UTC](https://www.ruby-forum.com/t/sample-rate-in-grc/241103/2 "2014-05-13T11:13:16Z")

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If you want 1e6 Hz (1MHz) of receive bandwidth at a center frequency of  
2.4e9 Hz (2.4GHz) then you just set the center frequency to 2.4e9 and  
sample rate to 1e6 in the UHD source block in GRC.

Mike