Hi,

I'm experimenting with transmitting a wav file using rpitx on my old raspberry pi. I am getting good wspr decodes between my shack and my house.

The program used to convert my wspr wav file to ssb is optimised for voice with a low pass filter of approximately 2.5KHZ.

What would be a better low pass filter for wspr as I'm aware 2.5KHZ is massive for wspr? Once I know this I'll work on generating a better ssb wav file.

Many thanks,

Chris