In a message dated 24/04/2006, DSaum@............ writes:

I am  still debugging my infrasound detector, but I have been picking up
some  interesting detections recently:

Here is a 24 hour data plot from this  morning 
_http://www.infiltec.com/Infrasound@................ (http://www.infiltec.com/Infrasound@................ 
with  an interesting data spike at 10:35UT (6:35AM local).

Here is a blow up  of the data showing that it is actually a small spike 
followed about 3 seconds  later by a larger spike.
_http://www.infiltec.com/Infrasound@................. 
(http://www.infiltec.com/Infrasound@.................   



Hi Dave,
 
    I suggest that you seal up the air inlet tube  and run the apparatus for 
24 hrs to see if it is picking up electrical  interference - and what sort? I 
note that you are using the computer power  supplies - they are not always 
well filtered. The signals, although clear,  are not very large.
     Do the times correspond to switching times of  the building temperature 
control or ventilation systems? Maybe switch them  on and off to see if you 
get any peaks? Do you have a fridge, or a water  cooler on the same circuit? 
Could this be power switching on the grid? My lights  do flicker occasionally. 
 
    Regards,
 
    Chris Chapman






In a message dated 24/04/2006, DSaum@............ writes:
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>I am=20
  still debugging my infrasound detector, but I have been picking up
some=
=20
  interesting detections recently:

Here is a 24 hour data plot from t=
his=20
  morning http://www.inf=
iltec.com/Infrasound@...............
with=20
  an interesting data spike at 10:35UT (6:35AM local).

Here is a blow=
 up=20
  of the data showing that it is actually a small spike followed about 3 sec=
onds=20
  later by a larger spike.
http://www.in=
filtec.com/Infrasound@................=20
  


Hi Dave,
 
    I suggest that you seal up the air inlet t=
ube=20
and run the apparatus for 24 hrs to see if it is picking up electrical=20
interference - and what sort? I note that you are using the computer power=20
supplies - they are not always well filtered. The signals, although cle=
ar,=20
are not very large.
     Do the times correspond to switching time=
s of=20
the building temperature control or ventilation systems? Maybe switch t=
hem=20
on and off to see if you get any peaks? Do you have a fridge, or a wate=
r=20
cooler on the same circuit? Could this be power switching on the grid? My li=
ghts=20
do flicker occasionally. 
 
    Regards,
 
    Chris Chapman