Telemetry Demodulator Board

Note: This board is no longer in production 

Online Documentation


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.  

Board Dimensions:
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.

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Larry Cochrane -