That's a good point. Even though I can see the signal better doesn't mean better decode I guess. My FST4-60 N6SS decode was done at 3K default band setting, and I have not decoded on FST4 with 600 Hz RFilter yet, however it is very beneficial on FT8. I will stay at 3k for initial testing, I did try 3khz prviously with N6SS on 300, without any luck.
On Wed, 10 Feb 2021, 1:51 pm Jim Brown, <k...@audiosystemsgroup.com> wrote: > On 2/9/2021 1:34 PM, Adrian wrote: > > Once a sought signal is known from a cluster or a random rx, then lost > > etc on its audio freq, you can hone in on it with narrow filtering. > > Last I heard, K1JT advised strongly against narrowing the IF, because > the filters create phase shift in the passband that can degrade > decoding. The top RTTY contesters have learned that -- they have > abandoned dual peak filters and now use 500 Hz bandwidth, narrowing only > in the presence of very strong signals in the passband. > > Those of us working in pro audio learned nearly 40 years ago that poor > phase response created by filters we were using degraded the ability of > the human ear-brain to understand speech, causing the smart designers to > develop and users to adopt "minimum-phase" filters in our systems. > > 73, Jim K9YC > > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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