I understand that the narrow (focus) filter is a fixed bandwidth and that the 
wider (context) filter bandwidth can be varied.
What is the width of the focus filter?

Currently it is 150 Hz.

 Do the roofing filters simply track the context filter bandwidth as it is 
narrowed?

Yes.  Context is currently limited to 600 Hz at its narrowest.

73,

Lyle KK7P

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