# Sampling rate of USRP2

**URL:** <https://www.ruby-forum.com/t/sampling-rate-of-usrp2/211225>\
**Category:** GNU Radio\
**Created:** [August 29, 2011, 11:22pm UTC](https://www.ruby-forum.com/t/sampling-rate-of-usrp2/211225 "2011-08-29T23:22:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\
**Post date:** [August 29, 2011, 11:22pm UTC](https://www.ruby-forum.com/t/sampling-rate-of-usrp2/211225/1 "2011-08-29T23:22:46Z")

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Hi,

I’m using USRP2 as transmitter of DVB-T signal.  
Is is possible to decrease default USRP2 sampling rate from 100MHz to  
multiple of 9,142MHz?  
Now I’m resampling signal but this solution is time consuming and I’m  
not able to get real-time performance of modulator.  
In fact I just need to slow down a USRP2 somehow. Do you have any ideas?  
(I’m using UHD driver.)

Regards,  
Marcin Szelest  
SQ9DJJ  
[http://szelest.org](http://szelest.org)

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**Author:** ![Marcin\_Szelest](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/f475e1/32.png) [@Marcin\_Szelest](https://www.ruby-forum.com/u/Marcin_Szelest)\
**Post date:** [August 29, 2011, 11:24pm UTC](https://www.ruby-forum.com/t/sampling-rate-of-usrp2/211225/2 "2011-08-29T23:24:37Z")

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The USRP2 is fixed at a 100MHz sample rate.

Are you using the polyphase resampler? Its CPU load should be  
significantly  
less than the “regular” rational resampler in Gnuradio.

–n