Scott,
NB attempts to deal with amplitude-based, spikey sorts of noise. It does
this by limiting amplitude or gating the signal.
NR attempts to deal with wideband, hiss-type noise. It does this by
building filters around frequency elements that seem fairly steady over
a short time. So, it is not very useful if you are already using a
narrow PBT or APF filter; it works best when the passband is fairly wide.
AutoNotch attempts to deal with steady, or nearly, narrow spectrum type
noise, like a tuning carrier. it does this by building a notch filter
around the frequency element(s) that seem fairly steady over a short time.
---
The best way to understand them is to simply use them. Experiment. You
won't hurt anything. Tune in a signal (W1AW code practice?) and try the
different filters and their settings, noting the type of noise they seem
to best deal with.
Do this many times, on several bands and at different times so you can
hear the widest variety of noise types and relative noise and signal
levels. Try it on strong an weak signals. You will develop a feel for
the types of noise that can -- and cannot -- be handled, and which tool
to use to best handle it.
Enjoy the ride!
73,
Lyle KK7P
let me word it a different way, being that no body replied to my
question.... can someone please explain to me the different NB and NR
settings and what to accomplish...
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