# Harmonic operation

**URL:** <https://discourse.myriadrf.org/t/harmonic-operation/849>\
**Category:** Amateur Radio\
**Created:** [1 March 2017 23:20 UTC](https://discourse.myriadrf.org/t/harmonic-operation/849 "2017-03-01T23:20:12Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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:** [3 March 2017 08:51 UTC](https://discourse.myriadrf.org/t/harmonic-operation/849/4 "2017-03-03T08:51:25Z")

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> [@Kc7noa](#):
>
> T/R switching might be needed for some applications

That reminds me that I meant to enquire about driving the LimeSDR GPIO. @Zack, @joshblum, do you know if this is accessible via an API? And if not, where would be the best place to add this?

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