DSP - T3-7
IF - NAR1
I'll have to start playing around with the NB settings more
often going forward. I'm not sure what effect this might
have on a received signal however. (didn't test that yet)
Are there any general guidelines for using NB? (i.e., DSP
versus IF, using only DSP, using both, etc.)
Whatever works best is good. I have lots of local manmade noise and
I find that DSP T2-6 and NAR3 seems to work pretty well.
You want to find a setting that will produce the best noise
reduction with acceptable signal distortion.
In a contest or pileup situation when there are lots of strong
signals the optimum setting may be less aggressive.
I've found that being too aggressive on the DSP NR settings
interferes with my ability to hear complete dits on weak CW signals.
I'll get part of a dit and sometimes miss hearing the dit if the NR
is too aggressive. Dahs aren't a problem to hear at all. This is
while using Extreme Isolation headphones. http://www.extremeheadphones.com/
I have tried the method suggested on this list of turning AGC off,
turning down the AF gain, turning down the RF gain, and controlling
audio level with the RF gain. I usually run the BW at around 200 to
300 cycles for weak CW signals, and around 100 or 50 cycles for
strong CW signals. That combination works amazingly well. Of course,
with the AGC off, I can't use NR. But I do have the narrow BW.
If I want to use NR, I have to turn on the AGC, and I can't tell much
difference if any between slow and fast. Then I use the lower NR
settings, especially for weak signals.
At my relatively RF-quiet location, the NB doesn't appear to make any
difference, and it shouldn't.
(500 cycle roofing filter installed.)
Playing with these settings while copying weak signal CW on 80m or
40m is a pretty good test.
As others have noted, you can sometimes hear CW more clearly down in
the noise by changing the sidetone frequency.
I haven't found any DSP solution to QRXYL yet. But any suggestions
are always welcome.
This is really interesting stuff and the K3 is quite configurable.
YMMV
Paul N4LCD
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