# RF performace of LimeSDR

**URL:** <https://discourse.myriadrf.org/t/rf-performace-of-limesdr/1980>\
**Category:** LimeSDR\
**Created:** [9 November 2017 02:37 UTC](https://discourse.myriadrf.org/t/rf-performace-of-limesdr/1980 "2017-11-09T02:37:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![huangming](https://avatars.discourse-cdn.com/v4/letter/h/b487fb/32.png) [@huangming](https://discourse.myriadrf.org/u/huangming)\
**Post date:** [9 November 2017 02:37 UTC](https://discourse.myriadrf.org/t/rf-performace-of-limesdr/1980/1 "2017-11-09T02:37:00Z")

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Dear sir,  
We use LimeSDR to measure spectrum of FM band. We find that the Spectrum in the frequency range of 88-108MHz is rather bad. The feature of the FM radio is not obvious. Could give us same example? Is there any solution?

 ![FM_spectrum](https://yyz2.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/7/77dcb4e51b1d7432322330bbc9941bdb05e9b20e.jpg)

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**Author:** ![Axeman](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/axeman/32/728_2.png) [@Axeman](https://discourse.myriadrf.org/u/Axeman)\
**Post date:** [9 November 2017 03:44 UTC](https://discourse.myriadrf.org/t/rf-performace-of-limesdr/1980/2 "2017-11-09T03:44:34Z")

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Try with all gains all set to zero to start.  
Make slider adjusters with settings from -10 to 10 and set the three gains to the sliders. Then you can see the effect of each one in real time.  
There are examples of FM broadcast receivers here somewhere.

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [9 November 2017 07:16 UTC](https://discourse.myriadrf.org/t/rf-performace-of-limesdr/1980/3 "2017-11-09T07:16:31Z")

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+1.

I would also highly recommend watching the Wireless Masterclass video series and in particular the second episode, which looks at the LMS7002M architecture and how best to configure this.

https://www.youtube.com/embed/0OngF1T83JU?feature=oembed&wmode=opaque&list=PLKf9sQQwTUJAuTEUTimRx8xRfKOvzO6Ad