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, [email protected] (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?
-----------------------------------------------------------------------
Bill Frantz | Truth and love must prevail | Periwinkle
(408)348-7900 | over lies and hate. | 150
Rivermead Rd #235
www.pwpconsult.com | - Vaclav Havel |
Peterborough, NH 03458
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