PSN-L Email List Message

Subject: Re: Noise Located
From: "Jerry Payton" gpayton880@.......
Date: Fri, 1 Dec 2006 14:38:35 -0600


SUPER job Ted.  Congratulations and thanks for sharing your mystery, methods 
for solving and source to EVERYONE.  We can all benefit.

Regards,
Jerry Payton

  ----- Original Message ----- 
  From: tchannel
  To: psn-l@..............
  Sent: Friday, December 01, 2006 2:22 PM
  Subject: Noise Located


  Hi Folks,   The mystery NOISE is solved!   Thanks to your suggestions, I
  removed the magnet assm. from the coil, of the sensor, and the noise
  stopped.  It started again when I replaced the magnet. RFI noise was
  therefore unlikely.

   The spikes looked similar to when I approached the sensor and stood next 
to
  it, as it sensed my weigh on the concrete floor.  During the night time
  hours the noise was gone.  It first I thought of road construction but it
  continue even on Sat and Sun.so I looked for other possibilities.

    On Thanksgiving, on our way to the in-laws, we had a road detour.  I 
gave
  it no thought as I had turkey and pie on my mind.
  I drove back to the detour work area this morning before 8:37am to see if
  they had heavy equipment, like a bulldozer.
  I found a large backhoe used to remove old roadway, and someone already at
  the controls, but it was not running.  I spoke to the guys, explained my
  interest, and ask about their work schedule.  They said they did not work 
on
  Sat and Sun.  but pointed down the road to another crew and other 
equipment,
  saying they might work weekends.  I thanked them and ask permission to 
walk
  down to the other crew.
  There I found a huge pile-driver, inactive.  I talked to the crew and 
asked
  their schedule, it matched my noise.  One of the guys volunteered to call 
me
  at home when they were ready to drive the next pile.  The pile were iron
  I-beams maybe 10" square x 24' long.  The site is only 1.5 miles Northwest 
from
  my sensor.  The sensor is pointing North/South and is a Lehman Horz.
  Pendulum.  When I got home I waited for the call, but could  already see
  some noise about 1/2 the size and shorter time durations, then my earlier 
big spikes.  Very similar to
  what you would expect by digging up the road with a backhoe, but no 5 to 
30mins patterns. No call at this time, but
  I figured the backhoe was now operating.

  Later, I got the call, from the second crew, they were ready to start
  the pile-driver, as they did, the sensor started picking up the same 
mystery
  noises.   I know this was a "DA!" moment.  If I would place my ear to the 
ground I
  might hear something that huge.

  I am going to print the signals and enlarge them, one each for the road
  crew.  The trace, to me is interesting, and I now can pick out which is 
the
  backhoe and which is the pile-driver.

  It was suggested to post a picture of this noise, on Larry's site and a
  picture of the sensor.  If I can do this I will try to include a location
  map and a picture of the heavy equipment.

  Many thanks to all of you for your help.  Ted







SUPER job Ted.  Congratulations and thanks for sharing your = mystery,=20 methods for solving and source to EVERYONE.  We can all = benefit.
 
Regards,
Jerry Payton
 
----- Original Message -----
From:=20 tchannel
To: psn-l@..............
Sent: Friday, December 01, 2006 = 2:22=20 PM
Subject: Noise Located

Hi=20 Folks,   The mystery NOISE is solved!   Thanks to = your=20 suggestions, I
removed the magnet assm. from the coil, of the = sensor, and=20 the noise
stopped.  It started again when I replaced the = magnet. RFI=20 noise was
therefore unlikely.

 The spikes looked = similar to=20 when I approached the sensor and stood next to
it, as it sensed my = weigh=20 on the concrete floor.  During the night time
hours the noise = was=20 gone.  It first I thought of road construction but it =
continue even=20 on Sat and Sun.so I looked for other possibilities.

  On=20 Thanksgiving, on our way to the in-laws, we had a road detour.  I = gave=20
it no thought as I had turkey and pie on my mind.
I drove back = to the=20 detour work area this morning before 8:37am to see if
they had = heavy=20 equipment, like a bulldozer.
I found a large backhoe used to remove = old=20 roadway, and someone already at
the controls, but it was not=20 running.  I spoke to the guys, explained my
interest, and ask = about=20 their work schedule.  They said they did not work on
Sat and=20 Sun.  but pointed down the road to another crew and other = equipment,=20
saying they might work weekends.  I thanked them and ask = permission=20 to walk
down to the other crew.
There I found a huge = pile-driver,=20 inactive.  I talked to the crew and asked
their schedule, it = matched=20 my noise.  One of the guys volunteered to call me
at home = when they=20 were ready to drive the next pile.  The pile were iron =
I-beams maybe=20 10" square x 24' long.  The site is only 1.5 miles Northwest=20 from 
my sensor.  The sensor is pointing North/South and = is a=20 Lehman Horz.
Pendulum.  When I got home I waited for the = call, but=20 could  already see
some noise about 1/2 the size and shorter = time=20 durations, then my earlier big spikes.  Very similar to =
what you=20 would expect by digging up the road with a backhoe, but no 5 to 30mins = patterns. No call at this time, but
I figured the backhoe was now=20 operating.

Later, I got the call, from the second crew, they = were ready=20 to start
the pile-driver, as they did, the sensor started picking = up the=20 same mystery
noises.   I know this was a "DA!" = moment.  If=20 I would place my ear to the ground I
might hear something that = huge. =20

I am going to print the signals and enlarge them, one each for = the=20 road
crew.  The trace, to me is interesting, and I now can = pick out=20 which is the
backhoe and which is the pile-driver.

It was = suggested=20 to post a picture of this noise, on Larry's site and a
picture of = the=20 sensor.  If I can do this I will try to include a location =
map and a=20 picture of the heavy equipment.

Many thanks to all of you for = your=20 help.  Ted


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