On Tue, 2009-11-10 at 10:24 -0800, Lyle Johnson wrote:

> The use of IIR filters is deprecated.  The K3 defaults to FIR filters 
> and we encourage you to use them.

For some conditions the slight ringing with the IIR filters can be a
real help, a bit like the effect that you can induce on some rigs with a
narrow APF filter. 
I find that the IIR filters are often better than the FIR filters for
moderate speed CW on a very noisy band like 160m.
They may not be the best all-round choice but they do have their good
points. 

-- 
73
Brendan EI6IZ 

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