Note: This board is no longer in production
This telemetry demodulator card is used to receive analog telemetry from remote seismometer sensors used by the USGS and other agencies. This board converts any one of 8 tones into an analog signal (+- 5 volts for a +- 125 hz deviation).The tones are spaced 340 hz apart and start at 680 hz. The tone to decode is selected buy a dip switch. To use this board you must be able to receive one of the USGS sensors using a radio scanner. The audio out of the scanner connects to the input of the board and the output can go to a analog to digital converter or a chart recorder.
5 3/4 x 7 3/4 inches or 14.5 x 19.7 cm.
Additional Information Earthquakes - After the Shock This article by Ken Navarre describes how the USGS uses telemetry to record earthquakes. In the article you will find a list of frequencies to look for telemetry signals.
Larry Cochrane - www.seismicnet.com/contact.html