>
>
> Hi Jim,
>
> Nice to hear from you.  We are having extensive discussions about how to 
> proceed with making this broadband vertical available to the amateur 
> community at reasonable cost.  I am in the process of making some 
> revisions to the smaller of the two instruments (Yuma ) which will be my 
> preference for the "production " configuration.
>
> Angel has been thinking of making mechanical parts in Panama  but no 
> commitment yet. We still have some work to do.
>
> In many ways this instrument is easier and less critical to assemble than 
> some of the traditional amateur instruments but it does require a good 
> understanding of the principles involved, and reasonable mechanical 
> skills. So far all of those who have built them on their own have had an 
> engineering background.
>
> This instrument will allow the amateur with a good site and well made 
> facility to get results equivalent to many professional installations.
>
> We are also working on the pressure case which is critical  to minimizing 
> buoyancy effects and case distortion from short period atmospheric 
> pressure changes. If well isolated from atmospheric effects the long 
> period noise is very low which will enable viewing of the long period 
> waves form large seismic events out to as long as 360 seconds.
>
> The design  is a quite different from the Sean-Thomas Morrissey and Allan 
> Coleman designs both mechanically and electrically however their 
> pioneering work is clearly recognized and acknowledged as influential in 
> many ways.

Brett will add some words of his own below.
>
> Best Regards, Dave
>
>
> Hi Jim,
>
> I'll throw in a couple of thoughts, too.
>
> Thanks for the kind words.  We're continually amazed with the performance 
> we're getting as the design continues to get refined.  Dave has probably 
> built a couple of dozen trial designs, with a handful making it to the 
> serious testing stage.  The original mechanical design was conceived by 
> Terry Brown, working with Dave when he visited Terry in Tennessee, with 
> the electronics  mostly being Dave's.  His capacitance displacement sensor 
> design is beautifully simple, and it works as well or better than any 
> sensor I've seen.  So far we don't know how good the instrument actually 
> is, since it appears likely to be better than Dave's rather quiet site.
>
> In terms of cost, the FBV electronic parts cost about $165 including the 
> circuit board, when the parts are purchased in small quantities--quite a 
> bit less, each, if you ordered for 25.  The uncertain part is the set of 
> mechanical parts.  If you turned them over to a commercial machine shop, 
> the cost would be lot$$.  But when they can be made at home, the raw 
> material would probably be under $100, and you'd still have enough 
> material left over to make some of the parts for several more.
>
> The pressure case is not a trivial part of the design and may have a 
> material cost of $100+.
>
> As I recall the Trillium Compact was about $8,000 plus something for the 
> cables.  Of course, that is a three-axis instrument.
>
> Regards,
> Brett
>
>
>>From: Jim ODonnell
>>Sent: Saturday, October 16, 2010 3:54 PM
>>To: psnlist@..............
>>Subject: Re: Period of seismic units<<< Super Home Brew<<<
>>
>>Hi Brett- I have been following Your & Dave's development of your Super 
>>Home Brew Z and am always impressed when you make a comparison with the 
>>very nice commercial
>>Nanometrics Trillium Compact 120 sensor.
>>
>>Did you start with Sean-Thomas Morrissey's:  STM-8 Leaf Spring Seismometer 
>>design?
>>see 
>>http://www.eas.slu.edu/People/STMorrissey/index.html
>>
>>Can you come up with a cost estimate of your Supre Home Brew (SHB), and 
>>cost for the 120?
>>Do you plan on selling your SHB?
>>
>>Congratulations for developing such a magnificant Seis.....Jim
>>
>>Jim O'Donnell BC-Geophysics
>>Geophysical Consultant/Contractor
>>Geotechnical/Geothermal/Oil & Gas/Mining Applications
>>Seismic Surveys- Surface Waves, Refraction, & Reflection
>>Ground Penetrating Radar, Resistivity, Magnetic, & VLF-EM Surveys
>>Geophysics@..........  702.293.5664  702.281.9081 cell
>>Boulder City, NV
>
>
>
> 

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