NJ Mike: If I understand your question, the answer is "Yes, as you
narrow the DSP BW with the 'WIDTH" knob, the roofing filters will switch
such that the narrowest filter that still includes the DSP BW will be
selected".
To your second question, the ultimate BW is set by the DSP, and on my
K3, that's 50 Hz. It doesn't really matter what roofing filter is
selected. The xtal filters are in the 1st IF [8 MHz] and their primary
[maybe only] purpose is to suppress strong signals outside the DSP BW
that would activate the AGC and affect the level of the desired signal
inside the DSP BW, even though you can't hear them. It follows that
you'd probably like the selection of roofing filters to follow the DSP
BW as closely as possible. You won't see any difference between your
Rigs A, B, and C.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
NJ Mike wrote:
If I understand it correctly, as you turn the bandwidth knob
counterclockwise, the filter narrows. At some point, it hits the next
roofing filter and then....narrows more? Just trying to understand so
I can
get the right filters. Rig A (below) is what Elecraft recommends for my
operating profile.
What would be the difference between the following three examples, as
far as
how narrow the bandwidth could actually be adjusted?
Rig A with 2.8, 2.1, 400, 250, 200 filters
Rig B with 2.8, 2.1, 400, 250 filters
Rig C with 2.8, 2.1, 400, 200 filters
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