# Phase drift , synchronization multi boards

**URL:** <https://discourse.myriadrf.org/t/phase-drift-synchronization-multi-boards/6642>\
**Category:** LimeSDR\
**Created:** [26 October 2020 17:49 UTC](https://discourse.myriadrf.org/t/phase-drift-synchronization-multi-boards/6642 "2020-10-26T17:49:04Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![mzs](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/mzs/32/2678_2.png) [@mzs](https://discourse.myriadrf.org/u/mzs)\
**Post date:** [2 November 2020 04:45 UTC](https://discourse.myriadrf.org/t/phase-drift-synchronization-multi-boards/6642/3 "2020-11-02T04:45:45Z")

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> [@cmichal](#):
>
> My memory is a little foggy on this, but I believe that the clock output isn’t actually connected on the board - if you want to use it you need to add a jumper of some sort.

“J19 connector can also be used to supply external reference clock (fitting R147, removing R137, C354)” from [LimeSDR-USB hardware description - Myriad-RF Wiki](https://wiki.myriadrf.org/LimeSDR-USB_hardware_description#Clock_distribution) or [Limesdr external clock - #2 by Zack](https://discourse.myriadrf.org/t/limesdr-external-clock/2058/2)

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