# Bias tee option on LimeSDR XTRX

**URL:** <https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105>\
**Category:** LimeSDR\
**Created:** [16 April 2026 01:58 UTC](https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105 "2026-04-16T01:58:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![osqzss](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/osqzss/32/4567_2.png) [@osqzss](https://discourse.myriadrf.org/u/osqzss)\
**Post date:** [16 April 2026 01:58 UTC](https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105/1 "2026-04-16T01:58:48Z")

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I have a LimeSDR XTRX v1.2 board and would like to enable the “bias tee” option shown in Figure 6 on the LimeSDR XTRX Boards website: [LimeSDR XTRX v1.2 Board — LimeSDR XTRX Boards 23.01 documentation](https://limesdr-xtrx.myriadrf.org/v1.2/)

However, I could not find any further details on the website. Could anyone please explain how to enable the “bias tee” option, both in hardware and in software?

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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:** [16 April 2026 09:34 UTC](https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105/2 "2026-04-16T09:34:16Z")

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Tagging @zack.

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**Author:** ![Zack](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/zack/32/89_2.png) [@Zack](https://discourse.myriadrf.org/u/Zack)\
**Post date:** [16 April 2026 12:47 UTC](https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105/3 "2026-04-16T12:47:28Z")

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Hi @osqzss

Bias tee is not fully populated by default. You have to solder MN53 (for RXA channel) and MN54 (for RXB channel) inductors to activate it. Check [schematic](https://github.com/myriadrf/LimeSDR-XTRX/blob/master/hardware/1v2/Project%20Outputs%20for%20LimeSDR-XTRX_1v2/LimeSDR-XTRX_1v2_Schematic_r0.PDF) page 6 for more information.

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**Author:** ![osqzss](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/osqzss/32/4567_2.png) [@osqzss](https://discourse.myriadrf.org/u/osqzss)\
**Post date:** [17 April 2026 02:10 UTC](https://discourse.myriadrf.org/t/bias-tee-option-on-limesdr-xtrx/13105/4 "2026-04-17T02:10:21Z")

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Thank you for the clear explanation. I understand that the bias tee is not populated by default. I will check the schematic as well.