IQ Signal Generator: Clean spectrum from harmonics

#1 · 25/03/2024, 14:10

I am trying to generate 5 CW sinewave frequencies with the V6 RSA-2000 and the IQ Signal Generator block.
So far it works fine, but how can I get rid of the mirrow or harmonic frequencies as shown in the attached screenshot?

Uploaded files:

#2 · 25/03/2024, 16:29

Cant reproduce but you might use the wrong windowing function. Flat Top should be what you want:

https://v6-forum.aaronia.de/forum/topic/different-fft-windowing-types-how-to-use-example-screenshots/