This is the design that was used by the UW and by the Alaska Volcano 
Observatory in
the late 1990's.  So far as I know, the design worked very 
well.  Newer stations are
generally all digital and broad band.  I assume that many stations 
are still using the VCO
technology for regional earthquake monitoring, as the cost is 
probably an order of
magnitude less.

Cheers,
John

At 01:12 PM 7/12/2006, you wrote:
>Hell all
>
>As we are all looking at telemetry equipment and design, can the 
>experts on this look at this document and let me know if it is worth 
>anything? http://www.pnsn.org/SHOP/MCVCO/blkdes.html
>
>Wayne
>
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