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IQ Signal Generator: Clean spectrum from harmonics

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:
  • 2024-03-25_5-transmit-frequencies-via-V6.png

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