# fathomX not working with voltage on tether

**URL:** <https://discuss.bluerobotics.com/t/fathomx-not-working-with-voltage-on-tether/14183>\
**Category:** Communication Interfaces\
**Created:** [April 24, 2023, 8:40pm UTC](https://discuss.bluerobotics.com/t/fathomx-not-working-with-voltage-on-tether/14183 "2023-04-24T20:40:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fbriggs](https://avatars.discourse-cdn.com/v4/letter/f/898d66/32.png) [@fbriggs](https://discuss.bluerobotics.com/u/fbriggs)\
**Post date:** [April 24, 2023, 8:40pm UTC](https://discuss.bluerobotics.com/t/fathomx-not-working-with-voltage-on-tether/14183/1 "2023-04-24T20:40:27Z")

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I just got a fathomX setup for my ROV and I am running a 380V power line. I got the fathomX integrated with 12V applied to the ground and robot side. I have a 24awg, single pair twisted tether wire and when I power up the fathomX without voltage on the tether the link comes up perfectly. As soon as I put 380V on the tether line the connection drops out. The tether at the moment is 60’. I have tried a short tether of about 2’ and that worked when I applied 380V. However, with the longer 60’ tether the link only works when I turn off the high voltage.