I believe at least some of the DSP filters in the K3 are FIR (Finite
Impulse Response) ones, which should be phase linear. The roofing
filters will not be phase linear, so I would think you could get away
with using a narrow DSP filter, as long as you used a relatively wide
roofing filter.
This will still leave the ADC, and the analogue circuitry between the
roofing filter and it, open to overloads, but will protect the sound card.
On 04/03/18 21:15, Jim Brown wrote:
There is a VERY good reason why WSJT developer, K1JT, advises users to
use wide IF bandwidth, and it's NOT the panoramic display. The reason is
that filters introduce phase shift in the passband, and phase shift is
the enemy of good decoding. The same physics, by
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