[Elecraft] Filter Recommendations

[Don Wilhelm]

Lee,

The 2.8kHz filter has a flatter passband and steeper skirts than the 2.7kHz.

But remember that this is a roofing filter, the DSP provides the actual 
filtering for the K3/K3S.
The purpose of the roofing filter is to keep strong adjacent signals 
from overloading the Hardware AGC and the ADC at the input to the DSP 
circuits.  A strong signal that is inside the passband of the roofing 
filter, but outside the passband of the DSP filter (you may not hear 
that signal since it is outside the DSP filter) can cause receiver AGC 
"pumping" and in extreme cases can overload the ADC causing severe 
"information garbling".

73,
Don W3FPR

On 8/26/2018 8:45 AM, Lee Murrah via Elecraft wrote:
> I am looking to upgrade my K3S with filters and am using the DX version of the radio as a guide.  What is the advantage of the 2.8 KHz filter over the stock 2.7?  What does the 2.1 KHz filter do for you?
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