[Elecraft] K3: Real world use of 1.8 filter (oops)

[Matt Zilmer]

Not sure what you mean by "feeling".  As the filter BW is narrowed, I
usually shift the Fc down as well.  This gives more balance to the
heard spectrum, which is a change of course.  When the roofing filter
shifts from 2.8 to 1.8, I can't "feel" a transition, maybe because of
this operating method.

The only way I've really ever perceived a transition is when using the
XFIL key to change roofing filter.  The transition is abrupt, as
expected.

I notice a reduction in distortion using the 1.8 filter in crowded
conditions.  Seems like most folks would notice better
intelligibility, but can't really sense distortion as such. Contesters
excluded, of course.  They can and do notice.

I feel a lot more IMD reduction in CW, while changing the DSP filter
bandwidth.  Much more.

Filters here:  0.25, 1.8, 2.8, 6.0, 13.0.

73,
matt W6NIA

On Sat, 14 Jan 2012 09:28:00 -0500, you wrote:

>I would like to change one word in the following paragraph.   In the
>last sentence, "If the SSB band..." change the word " If " to " Unless
>"
>
>Sorry about that.
>
>de Doug KR2Q
>
>I have to wonder out loud how many guys are "feeling" the DSP filter
>width impact when they go from their 2.7 to 2.1 to 1.8 on SSB versus
>how much of that is improvement in IMD reduction specs.  For 99%, they
>probably are "feeling" the narrower DSP filter impact (which means the
>narrower roofing filter has essentially no impact at all).  If the SSB
>band is packed with wall-to-wall very, very, very strong signals, then
>I'm betting that the roofing filter BW just won't matter for the vast
>majority of ops.
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