[Elecraft] K3 and PSK31 Data Mode and ESSB

[David Woolley (E.L)]

Jim Brown wrote:

> I understand, and that was my point. Reducing the total bandwidth at the 
> input of the sound card from 2.8 kHz to 200 Hz will make a signficant 
> improvement in the signal to noise ratio. It won't matter on strong 

Doing so only acts as a roofing filter.  With a good enough sound card 
and good enough algorithms, the terminal program ought to be able to 
eliminate the interference as well as using a narrow filter in the K3 DSP.

If the sound card is adding IMD products or the terminal program isn't 
designed to detect the signal in the presence of noise, you may benefit 
from using the K3 DSP as a roofing filter.


-- 
David Woolley
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