[Elecraft] Filter Question

[Bill Frantz]

You understand it well.

The plug in filters work before the AtoD converter and protect 
it from desense due to strong nearby signals. Desense occurs 
when the ALC reduces receive sensitivity because of this strong 
signal. This level of suppression can be useful with other hams 
operating nearby, like a neighbor or a multi-radio operation 
like field day with both CW and digital stations.

The width control works with the DSP filter to provide finer 
control of the bandwidth. By narrowing the passband, you can 
reduce the total band noise coming through the receiver and 
improve the signal to noise ratio for the desired signal. You 
can also use it to suppress a strong, slightly off frequency, signal.

Without other signals, the width control will work the same with 
or without the plug in filters. The ifs/ands/and buts are that 
if both filters are set to about the same width, the skirts will 
be a bit sharper. (DSP filters tend to have very sharp skirts.)

73 Bill AE6JV

On 9/9/20 at 1:24 PM, infomet at embarqmail.com (Wilson  Lamb) wrote:

>Would someone please explain the relationship between our plug 
>in filters (K3) and the variable filter response provided by 
>our width control.
>As I understand the situation, the plug in filters we buy are 
>roofing filters, used to prevent intermod from strong signals 
>outside the pass band.
>Is there more to it?
>If there were no other signals, would the width control work 
>the same with and without the plug in filters?
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