Heres a really off the wall thought. Do you have a local radio or TV station that drops carrier and starts up again at the posted times? Maybe you have some RFI problems. Bob Smith John Tacinelli wrote: > > Hi, > My name is John Tacinelli and I am new to the list. I have one of the Ward's seismographs. It is working pretty well ( I pi cked up the Kodiak Island quake on the 10th.) My problem is that at 8:45 PM every night I get a sudden increase (or decrease) in voltage through my amplifier that causes the trace to move off to the right hand side of the screen. It stays there until 5 :45 every morning. Then it goes right back. The seismograph itself doesnt seem to move. I have run it on an uninterruptible power supply and it still does it. I watched it happen tonight and I could detect no environmental change in the area of the s eismograph. > The seismograph is set up at the school where I teach. Maintenance thought it might be the outside lights turning on but tha t happens much earlier. That timing happens to coincide with the setting and rising of the sun (pretty close) but I can't thin k of anything solar that could affect a magnetic coil inside a building in a time span of about 2 seconds. I should mention tha t I have contacted Wards and they are stumped. Also the timing seems to be getting earlier, both in the evening and morning by about 30-40 seconds every day. If anyone can help me out I would really appreciate it since this problem is very vexing. Tha nks alot. I hope to be a regular contributor and I look forward to hearing from you all. > > John Tacinelli > Earth Science Instructor > Rochester Community and Technical College > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- --------- Avoid computer viruses -- Practice safe hex ------------- * * Specializing in small, cost effective embedded control systems * * Robert L. (Bob) Smith Smith Machine Works, Inc. internet bobsmith5@.............. Lumlay Road landline 804/745-1065 Richmond, Virginia 23236+1004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>