# TX DC calibration not working

**URL:** <https://discourse.myriadrf.org/t/tx-dc-calibration-not-working/1931>\
**Category:** LimeSDR\
**Created:** [27 October 2017 16:04 UTC](https://discourse.myriadrf.org/t/tx-dc-calibration-not-working/1931 "2017-10-27T16:04:10Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![ricardas](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/ricardas/32/86_2.png) [@ricardas](https://discourse.myriadrf.org/u/ricardas)\
**Post date:** [3 November 2017 11:33 UTC](https://discourse.myriadrf.org/t/tx-dc-calibration-not-working/1931/14 "2017-11-03T11:33:55Z")

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Correct about that function, but currently GUI uses the API function `LMS_Calibrate()` which always passes false to the useExtLoopback parameter.

> <https://github.com/myriadrf/LimeSuite/blob/master/src/API/lms7_device.cpp#L1537>

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