Which B/W works best for WSPR?

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Which B/W works best for WSPR?

OK guys, another question! Which bandwidth works best for receiving WSPR? I can use any bandwidth from 3.6kHz down to 50Hz, I settled on 800Hz (centred on 1500Hz) using the logic that it should give a better signal to noise ratio than a wider bandwidth plus it should eliminate the vast majority of the PSK signals around. Is my logic flawed, should I be using a wider bandwidth? I apologise if this has been discussed before!!

73, Sean G4UCJ