Just one remaining point of difference . . .
I have found that being able to either bodily move the passband, as in IF
Shift, or being able to independently place each slope of the passband, as
I can with the PRO, to be much more effective than just narrowing the
filter.
To me, what counts is *where* the passband is located, in addition to its
width and shape factor. And, of course, having the BFO properly placed,
which is the main actor affecting passband location and effectiveness.
Again, with the PRO that comes automatically when you choose your desired
offset frequency for CW.
You might want to look into a *good* audio DSP filter to use with your 817.
I have the JPS NIR-12 and it is superb for CW as well as NR and all the
other fancy stuff. Not made anymore, but if you can find a used one, it is
worth its weight in gold.
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489 Icom IC-765 #2349 Icom IC-756 PRO #2121
Caitlyn Martin wrote:
>
> Hi, George,
> >
> > Is this what you are referring to? Or do you want to be able to hear
> > only the "single (no hyphen) signal" that you are working or listening
> > to, all others being excluded?
>
> The latter. Strictly the latter.
> >
> > If the former, I have found that filter bandwidth has little to do
> > with"the other side." Any good filter should have adequate rejection
> > for that task almost without regard to its passband width.
>
> Tell that to an FT-817 with only the stock SSB filter. (Yuck!)
This is largely a consequence of both the poor shape factor of the filter
and the BFO insertion frequency. Moving the BFO further away from the
passband edge would probably help a lot.
> >
> > If the latter, then I can appreciate your desire to use the narrowest
> > possible filter. I frequently use 50 and 100 Hz IF DSP filters on my
> > PRO when the going gets really rough! <:}
>
> That's exactly what I mean, and I am referring to both SSB and CW. I
> consider a narrow SSB filter to be the best QRM fighting tool on SSB and
> a 250Hz or narrower filter to be a must for me on CW. Narrower is
> better provided it doesn't ring or become impossibly hollow sounding.
>
> 72/73,
> Caity
> KU4QD
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