# 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:** 6

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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:** [5 March 2017 08:31 UTC](https://discourse.myriadrf.org/t/harmonic-operation/849/6 "2017-03-05T08:31:13Z")

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Also with a lot of radio amateur use there will be a single antenna, with TX and RX on the same frequency and the need for PTT switching. I believe that a popular API for apps with this on Windows is ExtIO.

Sounds like we need to schedule the work required to support both these use cases, plus perhaps other non-TX/RX switching uses. Given there are multiple GPIOs, some could be used for switching in/out external filters and amplifiers etc. also. So some simple mechanism for just toggling GPIOs would be nice.

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