# How to set bandwidth on lime sdr mini

**URL:** <https://discourse.myriadrf.org/t/how-to-set-bandwidth-on-lime-sdr-mini/7309>\
**Category:** General Discussion\
**Created:** [12 August 2021 13:20 UTC](https://discourse.myriadrf.org/t/how-to-set-bandwidth-on-lime-sdr-mini/7309 "2021-08-12T13:20:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sanjay](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@sanjay](https://discourse.myriadrf.org/u/sanjay)\
**Post date:** [12 August 2021 13:20 UTC](https://discourse.myriadrf.org/t/how-to-set-bandwidth-on-lime-sdr-mini/7309/1 "2021-08-12T13:20:46Z")

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hello, I am new to lime sdr mini,  
I have two problems:

1. I want to test lime SDR mini in loopback mode, I have not connected anything except connecting lime SDR mini to my laptop. I configured transmit and receive frequency as same to test loopback mode. In fft viewer i cliked on “loopback RX to Tx” to see the waveform of generated signal and I am trying changing bandwidth but I am getting same waveform again and again. I want to know is this a right approach to test loopback mode?
2. I want 2.4 Ghz frequency with 1 Mhz bandwidth. How can I set the bandwidth. Here I mean to say that centre frequency is 2.4 Ghz with 0.5 Mhz on left side of signal, and 0.5 Mhz to the left side of signal.  
I tried using lime suite and using TBB tab and changing RF bandwidth from 1 to 100, but in fft viewer I am getting the same waveform(waveform like a mountain).

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**Author:** ![Rozana](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/rozana/32/3980_2.png) [@Rozana](https://discourse.myriadrf.org/u/Rozana)\
**Post date:** [9 September 2021 17:06 UTC](https://discourse.myriadrf.org/t/how-to-set-bandwidth-on-lime-sdr-mini/7309/2 "2021-09-09T17:06:39Z")

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Hi Sanjay,  
U may try gnu radio.there you will have the flexibility to set carrier frequency, bandwidth.you can easily do loopback test on that platform .  
Best wishes.