Hi Folks,  A while back I asked for help in determining the source of =
some noise showing up on my Helicorder.   This is an update to that =
question.
I have excluded auto traffic, as the noise happens weather it is =
weekends or work days, at about the same time.
I have excluded the schools in the area for the same reasons
I have excluded construction for the same reason.

I am not 100 percent sure of these exclusions, but for the most part, I =
think it is something else.

I have gone back several days on the Helicorder to see if I could find =
patterns, and I have found that all is quiet starting about 5:00 pm =
local time, 00 UTC.  Things remain quiet until 08:35 am, 15:35 UTC.   =
During the hours 8:00 am to 5:00 pm the noise comes and goes sometimes =
lasting less than one mins and sometimes lasting 5 to 10 mins.

The sensor, a Lehman, is in my basement.  It is on a concrete floor next =
to a concrete wall, and the house above is wood and brick.
Could this noise be the sun?  At about the time the noise begins the sun =
rises above the trees and shines on the east side of our house, which is =
also the wall near the sensor.
Could this warming of the wood and bricks, above the basement, and their =
expansion cause the noise.  As the clouds block the sun during the day, =
might this cause the intermittent noise during the day?   The noise =
stops about the time the sun no longer hit the house.

I could test this theory on a overcast day and I will do so, but I just =
wanted to get your input.








Hi Folks,  A while back I asked =
for help in=20
determining the source of some noise showing up on my =
Helicorder.  =20
This is an update to that question.
I have excluded auto traffic, as the =
noise happens=20
weather it is weekends or work days, at about the same =
time.
I have excluded the schools in the area =
for the=20
same reasons
I have excluded construction for the =
same=20
reason.
 
I am not 100 percent sure of these =
exclusions, but=20
for the most part, I think it is something else.
 
I have gone back several days on the =
Helicorder to=20
see if I could find patterns, and I have found that all is quiet =
starting about=20
5:00 pm local time, 00 UTC.  Things remain quiet until 08:35 am, =
15:35=20
UTC.   During the hours 8:00 am to 5:00 pm the noise comes and =
goes=20
sometimes lasting less than one mins and sometimes lasting 5 to 10=20
mins.
 
The sensor, a Lehman, is in my =
basement.  It=20
is on a concrete floor next to a concrete wall, and the house above is =
wood and=20
brick.
Could this noise be the sun?  At =
about the=20
time the noise begins the sun rises above the trees and shines on the =
east side=20
of our house, which is also the wall near the sensor.
Could this warming of the wood and =
bricks, above=20
the basement, and their expansion cause the noise.  As the clouds =
block the=20
sun during the day, might this cause the intermittent noise during the=20
day?   The noise stops about the time the sun no longer hit =
the=20
house.
 
I could test this theory on a overcast =
day and I=20
will do so, but I just wanted to get your input.
 
Thanks, Ted