The NB on my 990 seems to deal very well with power-line noise consisting
of 60Hz/120Hz arcs and with electric-fence arcs. It doesn't deal with
random 'hash' or 'hiss'. A good way to see if it's functioning would be
to tune close to a loud (>S9) CW station (about 5kHz away) and turn the
noise blanker on. If it's working, you'll hear the receiver desense with
the CW station's sending.
73, Ward N0AX
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