Receive filter bandwidth for WSPR

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VK3LU
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Joined: 2016/01/15 - 10:28
Receive filter bandwidth for WSPR

I read somewhere, possibly here, that the bandwidth of the receiver rx filter should be set to at least 3.6 kHz.
Why?
I would have thought that a width that comfortably covers the 200Hz WSPR allocation would be better as it would keep out unnecessary crud.
But I am probably missing something!!

Nev