Hi Ted,
can you send me the files to have a look at please, also do you have any =
electronics inside the seismometer enclosures which may be adding =
convective heating and turbulence ?
thanks
Dale
  ----- Original Message -----=20
  From: Ted Channel=20
  To: psn=20
  Sent: Thursday, December 24, 2009 12:59 PM
  Subject: Long Frequency noise?


  Hi Folks,  I just recorded the 6.3M Primor'ye Russia,  on three =
sensors, a Lehman, a Vertical and a new horz I call ch 2.

  The Ch 2 sensor is new, and has a period of 22 second, horz pendulum =
like a Lehman.   This new sensor has always had (long period noise)?  =
FFT...... This was the first earthquake I have received since I =
installed it.   I normally filter 1 for low pass, .05 for high =
pass................This time I had to use 1 for low pass and .5 for =
high pass, to clean it up.

  I can send all three .psn files, all unfiltered, if you think you can =
tell me what is causing the noise.    I won't try to go into great =
detail here.   All three sensor recorded it clearly buy something is not =
right.








Hi Ted,
can you send me the files to have a =
look at please,=20
also do you have any electronics inside the seismometer enclosures which =
may be=20
adding convective heating and turbulence ?
thanks
Dale

  
----- Original Message ----- 
  From:=20
  Ted=20
  Channel 
  
To: psn 
  
Sent: Thursday, December 24, =
2009 12:59=20
  PM
  
Subject: Long Frequency =
noise?
  


  
Hi Folks,  I just recorded the =
6.3M=20
  Primor'ye Russia,  on three sensors, a Lehman, a Vertical and a =
new horz=20
  I call ch 2.
  
 
  
The Ch 2 sensor is new, and has a =
period of 22=20
  second, horz pendulum like a Lehman.   This new sensor has =
always=20
  had (long period noise)?  FFT...... This was the first =
earthquake I=20
  have received since I installed it.   I normally filter 1 =
for low=20
  pass, .05 for high pass................This time I had to use 1 for =
low pass=20
  and .5 for high pass, to clean it up.
  
 
  
I can send all three .psn files, all =
unfiltered,=20
  if you think you can tell me what is causing the =
noise.    I=20
  won't try to go into great detail here.   All three sensor =
recorded=20
  it clearly buy something is not right.
  
 
  
Thanks, =
Ted