Hi All,

I have been working with a new PSN member who would like to set up his own
station. He lives here in N. California. Too start with he is only
interested in local events. Since he doesn't have the time to build his own
senor, I offered to look for a geophone for him.  I have contacted R.T.
Clark and Mitcham Industries for quotes for a 1 hz or 4.5 hz geophone. R.T
Clark is offering the following:

Mark products L-4C, 1 hz seismometer      $375.00
Connecting cable                                          $75.00
(the connecting cable cost is a little high in my opinion )

and Jim at Mitcham Industries sent me this:
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I'll take $300.00 for a 1 Hz phone.  $55.00 for a single 4.5 Hz.

It's hard for me to sell these one at a time.  You can have 10 of the 4.5's
for $375.00.  Or 5 ea. 4.5's and one 1 Hz for $475.00.

The 1 Hz is Geospace HS-10-1 single vertical geophone in aluminum case and
no spike (smooth bottom) with coil position indicator.  It has about a 2
meter lead with alligator clip connectors.  It weighs about 9 pounds.

The 4.5 Hz is Mark Products L10B single vertical geophone in aluminum case
with 2 3/4 inch spike,3 foot lead and Amphib IV connector.  They have a
shunt resistor soldered across them for approximately 60% damping.
------

Jim at Mitcham Industries has contacted me before about having to sell one
unit at a time too our members. Since I don't have the free $$$ to stock
sensors, I offered to see if we could get together a group buy.  

So I have a few questions...

1:  Is there much difference between L-4C and the HS-10-1 and would the
extra 75.00 be worth the money?

2:  Anyone interested in a group buy? 

3:  Does anyone have a sensor, or a source for a sensor, that Doug (the
person I'm working with) could buy? 

Thanks,

-Larry Cochrane
Redwood City, PSN


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