I have used one for years. It works exactly as
advertised with a few exceptions. W8JI has a short
article on his web page that details its short
comings.
One thing to note is that it only works well when you
have a "point" noise source. In that case you can
create a very good null which is normally my
situation. If you do not, then the performance will
suffer.
Greg
W7MY
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