[Elecraft] K3 DSP shape factor?

[David Woolley (E.L)]

Lyle Johnson wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">> The 
> question I have is "What is the effective shape factor of the K3
>> DSP?"
> 
> DSP filters usually are so-called Finite Impulse Response (FIR).  FIR 

I seem to remember that, originally, all the K3 IF filters were IIR 
(infinite impulse response) filters.  Subsequently FIR filters were 
provided, as a user choice, for one end of the bandwidth range.

IIR filters give a better shape factor for a given amount of processing 
power, but are prone to ringing (that's basically want the infinite 
response means) and don't have constant group delays (whereas symmetric 
FIR ones do).

-- 
David Woolley
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