# Change frequency at runtime

**URL:** <https://www.ruby-forum.com/t/change-frequency-at-runtime/224147>\
**Category:** GNU Radio\
**Created:** [October 31, 2012, 10:22pm UTC](https://www.ruby-forum.com/t/change-frequency-at-runtime/224147 "2012-10-31T22:22:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [October 31, 2012, 10:22pm UTC](https://www.ruby-forum.com/t/change-frequency-at-runtime/224147/1 "2012-10-31T22:22:28Z")

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I want to change the frequency at run-time for ofdm,How I can do so can  
anybody provide me any pointers ?

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**Author:** ![usrp\_n210](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2bfe46/32.png) [@usrp\_n210](https://www.ruby-forum.com/u/usrp_n210)\
**Post date:** [October 31, 2012, 10:30pm UTC](https://www.ruby-forum.com/t/change-frequency-at-runtime/224147/2 "2012-10-31T22:30:04Z")

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On Wed, Oct 31, 2012 at 5:21 PM, usrp n210 [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> I want to change the frequency at run-time for ofdm,How I can do so can  
> anybody provide me any pointers ?

Use the uhd.tune() function.

Tom

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**Author:** ![usrp\_n210](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2bfe46/32.png) [@usrp\_n210](https://www.ruby-forum.com/u/usrp_n210)\
**Post date:** [October 31, 2012, 10:35pm UTC](https://www.ruby-forum.com/t/change-frequency-at-runtime/224147/3 "2012-10-31T22:35:56Z")

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On 10/31/2012 02:21 PM, usrp n210 wrote:

> I want to change the frequency at run-time for ofdm,How I can do so can  
> anybody provide me any pointers ?

Its the same call you would use at initialization time:

usrp\_source/sink.set\_center\_freq(..)  
[http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/include/gr\_uhd\_usrp\_source.h#n186](http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/include/gr_uhd_usrp_source.h#n186)

-josh