Topband: Mysterious Noise revision

[Tod-ID]

In response to requests I have added text explanations under the various
spectrum scans for the web site note, I also added two additional scans that
show more clearly the amplitude roll-off between 1.9 and 2.3 MHz.

The URL remains the same =>
http://www.k0to.us/HAM/Noise/4kHz%20noise/index.htm

My thanks to those of you who have already made useful suggestions for
finding this noise.

Tod, K0TO