[Elecraft] [K3] Roofing Filters

[Bill W4ZV]

Dick Dievendorff wrote:
> 
> I'll guess that 5 poles is often enough, 8 poles is almost always plenty
> and
> the benefit gained by going from 8 to 16 poles wouldn't often be very
> important.
> 

Don't forget that the roofing filter is cascaded with the DSP filter, which
is typically equivalent to an 8-pole crystal filter at a setting of 400 Hz,
so the effective selectivity is already ~16 poles.

73,  Bill
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