I have two S-G seisms running and everything was fine. I had the amplifiers adjusted to display about +/-100 counts of background noise. Sunday (8/29/99) I turned on the monitor on my SDR computer. All channels (HI/LO on both N/S and E/W) are somewhat more noisy. The average values are now about +/-300 to 400 counts. I retrieved a block of data from my N/S channel during a quiet time (2:00am LOCAL). I then switched to the FFT screen and noted a peak at 0.12 on LOG(f) scale (x axis). I assume that the scale is log base 10 of frequency or 0.12 = approx 1.3 Hz?? Would this increase in noise be caused by the hurricane on the East Coast (I am located in NW Ohio). I remember seeing something on this list sometime ago, but can't remember if there was a characteristic frequency of this hurricane noise. If the hurricane isn't doing it, it's time for some detective work!! Any help would appreciated before I start looking for gremlins!!! -- Rex Klopfentein, Jr. rklopfen@......... http://www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>