# Re: FFT for FM Tx and Rx

**URL:** <https://www.ruby-forum.com/t/re-fft-for-fm-tx-and-rx/242435>\
**Category:** GNU Radio\
**Created:** [June 23, 2015, 11:59pm UTC](https://www.ruby-forum.com/t/re-fft-for-fm-tx-and-rx/242435 "2015-06-23T23:59:43Z")\
**Posts on this page:** 1\
**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:** [June 23, 2015, 11:59pm UTC](https://www.ruby-forum.com/t/re-fft-for-fm-tx-and-rx/242435/1 "2015-06-23T23:59:43Z")

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Hi, Marcus.  
Thanks for the reply. I use antennas for the transmitter and receivers,  
I forgot to mention I use two N210 USRP platforms with WBX  
daughterboards. When the transmitter is off, there is no other signal in  
that frequency band. I believe I should try to make an advanced tuning  
in order to set an offset for the local oscillator, that might eliminate  
the spurious component. What other methods can I use in order to  
eliminate the spurious components? Is a band-pass filter at the receiver  
a good option?