June 2, 2003
This time I am concentrated on the lines
seen in this graph. The pulses are a regular occurrence these days
but the lines are another matter. The following graphs show a situation
caused by the transmission of the
lines ( pulses ) in section B. All graphs are raw data.
This is an expanded view of Section A
This is the FFT graph of expanded Section A pulses, note ground noise level.
This graph shows expansion of Section
B, the whole sequence is exactly 600 secs long
= 10 min. It is comprised of 39 pulses in total, 38 are 15 secs wide and one is 30 secs. I don't
believe that these pulses are part of the bigger pulse chain in Section A but superimposed
This FFT above is of Section B ( expanded
) now it is possible to see the effects of these pulses
on the ground noise levels, note also that there are multiple pulses appearing right through the
spectrum. An increase of at least 10 in noise level.
Table of frequencies above:
1 - 1.611 Hz
2 - 2.538 Hz
3 - 4.820 Hz
4 - 8.055 Hz
5 - 11.25 Hz
6 - 14.49 Hz
7 - 17.68 Hz
8 - 20.90 Hz
9 - 24.10 Hz
10 - 27.32 Hz
Compare with the same frequencies for
the Section A pulses, so the only true
changes are the multiple pulses and the noise levels. It may be some form of calibration
technique, as these multiple pulses are relatively rare it is hard to say what is going on exactly.