# I can't figure out what this is on 20M...or why it's happening

**URL:** <https://discourse.myriadrf.org/t/i-cant-figure-out-what-this-is-on-20m-or-why-its-happening/937>\
**Category:** Amateur Radio\
**Created:** [12 March 2017 22:44 UTC](https://discourse.myriadrf.org/t/i-cant-figure-out-what-this-is-on-20m-or-why-its-happening/937 "2017-03-12T22:44:55Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Kc7noa](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/kc7noa/32/144_2.png) [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)\
**Post date:** [13 March 2017 02:20 UTC](https://discourse.myriadrf.org/t/i-cant-figure-out-what-this-is-on-20m-or-why-its-happening/937/5 "2017-03-13T02:20:00Z")

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> [@Ramsin](#):
>
> That…ok, so that makes sense, but is there no way to stop it? or a remedy?

Filters …

This might make you go “dang”

> [@Harmonic operation](https://discourse.myriadrf.org/t/harmonic-operation/849/8):
>
> I did some harmonic testing at 10/24/47/78 GHz. The LimeSDR makes a good signal source with a few add-ons… This is the LimeSDR set up on the bench. I GPS locked it for Freq stability, That is the pigtail on the top right. You can see he Lime is locked if you look at the LED’s. The fourth LED (below the red one) that is usually off is on Green. This indicates Lock. The antenna is WA5VJB 2-11 GHz LPA. On 10/24 GHz, I used 3456 out of the LimeSDR. With the 10 GHz rig still sitting on a …

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