All,

The first batch of sensors arrived today. They look like they are in good
condition. I took some pictures of them with my digital camera (a RICOH
4200 I bought a few months ago) and made a web page at
http://www.seismicnet.com/geophone/index.html.

The coil resistance for the 1 hz devices is around 400 ohms and the 4.5 hz
sensors around 220 ohms. This gives the 1 hz device a sensitivity of 2.99
V/ ips (volts per inch per second). 

I currently have one of the 1 hz units on line. The event file extension is
*.lc9. This replaces the *.lc2 channel that was connected to a 4.5 hz
vertical sensor. If I had more free channels I would record both. I'll see
if I can set up another SDR system so I can monitor both type of sensors
simultaneously.

-Larry Cochrane
Redwood City, PSN


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