# VCO settings

**URL:** <https://discourse.myriadrf.org/t/vco-settings/3537>\
**Category:** LimeSDR\
**Created:** [26 October 2018 05:47 UTC](https://discourse.myriadrf.org/t/vco-settings/3537 "2018-10-26T05:47:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Matti](https://avatars.discourse-cdn.com/v4/letter/m/e480ec/32.png) [@Matti](https://discourse.myriadrf.org/u/Matti)\
**Post date:** [26 October 2018 05:47 UTC](https://discourse.myriadrf.org/t/vco-settings/3537/1 "2018-10-26T05:47:37Z")

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Hi,

I have tested LimeSDR for signal generation. I’m measuring TX signal at 866MHz with the spectrum analyser. I can see some peaks +/-205kHz from the carrier. The level is 50dB below the carrier.

 ![SXT_CSW_VCO 115(default)](https://yyz2.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/9/9caaac089d4eb96842a12d97c852726302126b79.gif)

I believe peaks might be caused by VCO. I was able to get rid of peaks by adjusting CSW\_VCO manually from 115 to 125. Then I don’t see peaks anymore.

 ![SXT_CSW_VCO 125](https://yyz2.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/c/c6cdb2e0ed946af19a214931d0ba9ab8026c46c5.gif)

I was able to find this with trial and error. What is causing these +/- 205kHz peaks and what would be the best way to get rid of them?