In a message dated 2006/10/27, geodynamics@....... writes:

> Even slight jostling of the geophones can generate a pretty strong signal 
> -- well in excess of 10-volts -- that can over-saturate or even damage some 
> ADC boards.

Hi Tim,

       Jon is using one of Larry's amplifiers. It has 12 V rails.

       If Jon does as you suggest and the whole area floods with snow melt 
water, melts and re freezes a few times, won't it likely damage the geophones? 
The climate in Iceland is chilly in winter. I would enclose them in a sealed 
container under dry sand. It is not difficult to seal cable into plastic water 
pipe. You can easily buy tank fittings for plastic water pipe to seal to a 
container. 

       Can you check this message and see if there is a HTML attachment, 
please?

       Regards,

       Chris Chapman
In a me=
ssage dated 2006/10/27, geodynamics@....... writes:



Even slight jostling of the geo=
phones can generate a pretty strong signal -- well in excess of 10-volts --=20=
that can over-saturate or even damage some ADC boards.




Hi Tim,



       Jon is using one of Larry's amplifiers.=
 It has 12 V rails.



       If Jon does as you suggest and the whol=
e area floods with snow melt water, melts and re freezes a few times, won't=20=
it likely damage the geophones? The climate in Iceland is chilly in winter.=20=
I would enclose them in a sealed container under dry sand. It is not difficu=
lt to seal cable into plastic water pipe. You can easily buy tank fittings f=
or plastic water pipe to seal to a container. 



       Can you check this message and see if t=
here is a HTML attachment, please?



       Regards,



       Chris Chapman