FFT1M option only works up to 131072 FFTs

David3542

45 Posts

Mitglieder

#1 · 10/08/2021, 06:38

I have FFT1M feature in my license manager, but in IQ Power Spectrum section I can't increase FFT size more than 131072

same as attached photo !

What's the reason ?

Uploaded files:

AdminTC

1,086 Posts

Admin Mitglieder

#2 · 10/08/2021, 11:42

You need to adjust the DSP Memory Model (Titelbar under Extras -> Configuration): The default is set to "Medium" which limits the maximum FFT size to 131072 FFTs.

You need to set it to "Large" for a 1M FFT:

Rose the DSP Memory Model for a higher FFT rate

BTW: Setting it to "Small" will reduce it to 32768 FFTs,

David3542 has reacted to this post.

David3542

45 PostsTopic Author

Mitglieder

#3 · 11/08/2021, 08:15

Quote from AdminTC on 10/08/2021, 11:42

You need to adjust the DSP Memory Model (Titelbar under Extras -> Configuration): The default is set to "Medium" which limits the maximum FFT size to 131072 FFTs.

You nee to set it to "Large" for a 1M FFT:

BTW: Setting it to "Small" will reduce it to 32768 FFTs,

Thanks you ! ,now it works fine