Hi Larry,
    Would appreciate receiving a  copy.
    Thanks and  regards,
    Al
 
 
In a message dated 10/23/2009 8:53:13 A.M. Central Daylight Time,  
lconklin@............ writes:

Hi  Ted,

I have an Excel spreadsheet that I use to record the events I've  seen 
with my SG system.  The sheet includes a magnitude vs distance  scatter 
plot, with each point color coded (A - D) to represent my (very)  
subjective assessment of the quality of the detection.  I have a  
database of over 800 events.

My system is far from an optimal  construction and my location is pretty 
noisy, but I think overall my  results are reasonably typical of a fair 
to middlen amateur  system.

If you or anyone else would like a copy of the sheet and data  to examine 
for comparison to your own results, I'd be happy to send it to  you. 
I've included a few other features, and I use it to manage all of my  
event files.

Larry

tchannel wrote:
> I have a follow  up question, only somewhat related.   When the sensor is 
>  completed, one of the first questions a novice might ask is "What can I  
> expect to see"?     I know this would depend, not only  the sensor, but 
> many other things, like the location, and the other  components of the 
> station.
> We all try to build the best one  we can, using the ideas and materials 
> we have.   This site  is the best tool I have in my workshop.
>  
> The most common  statement I have seen is,  "My sensor can see >7.0M 
> anywhere  in the world"   I have never complete a sensor which could not  
> do this.
> I view USGS sites, and find equipment costing  thousands of dollars, pick 
> up more and small events, then mine, but  not not by much.
> I also know, several of my ideas are not as sensitive  as they could be, 
> and some of the ideas simply don't  work.   I learn a lot from both 
> failures and  successes.
>  
> Could someone state, as best as you can  "What should I expect to see"?
> Something like:
>  >6.8m  anywhere in the world.
>  >6.m within 90 degrees
>   >5.m within 30 degrees  
>  
> All who have been  doing this for a while, know what our equipment will 
> see.    If someone, with really nice homebuilt sensors, would share these 
>  numbers, it would act, for me, as a benchmark.
>  
> Thanks,  Ted
> 
>     ----- Original Message  -----
>     *From:* Randy Pratt  
>     *To:*  psn-l@.............. 
>   *Sent:* Friday, October 23, 2009 12:29 AM
>   *Subject:* Re: Instument Quality
> 
>   Chris,
>      
>     I  apologize for misreading your tone and intent.  It's an
>   unfortunate attribute of email that it loses personality.  I  agree
>     that a school purchasing an instrument for  instruction should have a
>     high quality but I don't  see that our schools are at that point or
>     that  caveman is recommending this as a school solution. 
>     
>     Let me try to explain my sensitivity.   My son's middle school
>     dropped earth science to  meet state mandates for an increase in
>     physical  education hours.  We moved shortly after that to another
>   state.  Here I became involved with the science fair and to  my shock
>     the largest middle school in the region  did not participate.  When I
>     inquired I found  no contract for extra work outside the classroom
>      hours so no science projects.  One high school science  teacher
>     explained to me that there is no time to  fit any extra topics in
>     order to meet federal and  state curriculum guidelines.  The one
>     teacher  that did let me demonstrate a seismograph left the area
>   and her job was cut.  A German exchange student I am hosting  is near
>     the top of the English class and shows  better understanding than
>     most others according to  her teacher.  She has only been in the
>     US  since August so what does that tell you.  Our political  mandates
>     are dumbing down the best students.   It really is approved and
>     budgeted science only and  that leaves only individual interest.
>       
>     An old magazine article from 1960 something about  a smoked drum
>     seismograph stuck in my mind until I  started to research in 1995 and
>     build my  first.  The Lehman article has been the basis for many on
>   this list but few of us are using pipe fittings on a board  anymore. 
>     Maybe something simple like the caveman  web page will spark other
>     individual  interest.  How well it functions doesn't matter
>   if thinking is set in motion and the steps to reach something  better
>     follow.  That's where learning  starts.  Think about what percent of
>      aeronautical engineers started with paper airplanes looping into  the
>     ground and being refolded? 
>   
>      Randy
__________________________________________________________

Public  Seismic Network Mailing List (PSN-L)

To leave this list email  PSN-L-REQUEST@.............. with 
the body of the message (first line  only): unsubscribe
See http://www.seismicnet.com/maillist.html for more  information.







Hi Larry,
    Would appreciate recei=
ving a=20
copy.
    Thanks and=20
regards,
    Al
 

In a message dated 10/23/2009 8:53:13 A.M. Central Daylight Time,=20
lconklin@............ writes:
Hi=20
  Ted,

I have an Excel spreadsheet that I use to record the events=
 I've=20
  seen 
with my SG system.  The sheet includes a magnitude vs dist=
ance=20
  scatter 
plot, with each point color coded (A - D) to represent my (v=
ery)=20
  
subjective assessment of the quality of the detection.  I have=
 a=20
  
database of over 800 events.

My system is far from an optimal=
=20
  construction and my location is pretty 
noisy, but I think overall my=
=20
  results are reasonably typical of a fair 
to middlen amateur=20
  system.

If you or anyone else would like a copy of the sheet and=
 data=20
  to examine 
for comparison to your own results, I'd be happy to send=
 it to=20
  you. 
I've included a few other features, and I use it to manage all=
 of my=20
  
event files.

Larry

tchannel wrote:
> I have a fo=
llow=20
  up question, only somewhat related.   When the sensor is 
&=
gt;=20
  completed, one of the first questions a novice might ask is "What can I=
=20
  
> expect to see"?     I know this would depend, no=
t only=20
  the sensor, but 
> many other things, like the location, and the=
 other=20
  components of the 
> station.
> We all try to build the best=
 one=20
  we can, using the ideas and materials 
> we have.   This=
 site=20
  is the best tool I have in my workshop.
>  
> The most=
 common=20
  statement I have seen is,  "My sensor can see >7.0M 
> any=
where=20
  in the world"   I have never complete a sensor which could not=
=20
  
> do this.
> I view USGS sites, and find equipment costing=
=20
  thousands of dollars, pick 
> up more and small events, then mine,=
 but=20
  not not by much.
> I also know, several of my ideas are not as sen=
sitive=20
  as they could be, 
> and some of the ideas simply don't=20
  work.   I learn a lot from both 
> failures and=20
  successes.
>  
> Could someone state, as best as you ca=
n=20
  "What should I expect to see"?
> Something like:
>  >=
;6.8m=20
  anywhere in the world.
>  >6.m within 90 degrees
>&n=
bsp;=20
  >5.m within 30 degrees  
>  
> All who have bee=
n=20
  doing this for a while, know what our equipment will 
> see. =
 =20
  If someone, with really nice homebuilt sensors, would share these 
&g=
t;=20
  numbers, it would act, for me, as a benchmark.
>  
> Th=
anks,=20
  Ted
> 
>     ----- Original Message=20
  -----
>     *From:* Randy Pratt=20
  <mailto:rpratt@.............>
>     *To:*=20
  psn-l@.............. <mailto:psn-l@..............>
> =
=20
     *Sent:* Friday, October 23, 2009 12:29 AM
> =20
     *Subject:* Re: Instument Quality
> 
> =20
     Chris,
>      
>   &nb=
sp; I=20
  apologize for misreading your tone and intent.  It's an
>&nbs=
p;=20
     unfortunate attribute of email that it loses personality.&n=
bsp; I=20
  agree
>     that a school purchasing an instrument=
 for=20
  instruction should have a
>     high quality but I=
 don't=20
  see that our schools are at that point or
>     tha=
t=20
  caveman is recommending this as a school solution. 
>   =
=20
    
>     Let me try to explain my sensitivity.=
 =20
  My son's middle school
>     dropped earth science=
 to=20
  meet state mandates for an increase in
>     physic=
al=20
  education hours.  We moved shortly after that to another
>&nb=
sp;=20
     state.  Here I became involved with the science fair=
 and to=20
  my shock
>     the largest middle school in the reg=
ion=20
  did not participate.  When I
>     inquired I=
 found=20
  no contract for extra work outside the classroom
>   &nb=
sp;=20
  hours so no science projects.  One high school science=20
  teacher
>     explained to me that there is no time=
 to=20
  fit any extra topics in
>     order to meet federal=
 and=20
  state curriculum guidelines.  The one
>     te=
acher=20
  that did let me demonstrate a seismograph left the area
> =20
     and her job was cut.  A German exchange student I am=
 hosting=20
  is near
>     the top of the English class and show=
s=20
  better understanding than
>     most others accordi=
ng to=20
  her teacher.  She has only been in the
>    =
 US=20
  since August so what does that tell you.  Our political=20
  mandates
>     are dumbing down the best students.&=
nbsp;=20
  It really is approved and
>     budgeted science on=
ly and=20
  that leaves only individual interest.
>     =20
  
>     An old magazine article from 1960 something=
 about=20
  a smoked drum
>     seismograph stuck in my mind un=
til I=20
  started to research in 1995 and
>     build my=20
  first.  The Lehman article has been the basis for many on
>&n=
bsp;=20
     this list but few of us are using pipe fittings on a board=
=20
  anymore. 
>     Maybe something simple like the cav=
eman=20
  web page will spark other
>     individual=20
  interest.  How well it functions doesn't matter
> =20
     if thinking is set in motion and the steps to reach somethi=
ng=20
  better
>     follow.  That's where learning=20
  starts.  Think about what percent of
>    =20
  aeronautical engineers started with paper airplanes looping into=20
  the
>     ground and being refolded? 
> =
=20
      
>    =20
  Randy
__________________________________________________________
<=
BR>Public=20
  Seismic Network Mailing List (PSN-L)

To leave this list email=20
  PSN-L-REQUEST@.............. with 
the body of the message (first lin=
e=20
  only): unsubscribe
See http://www.seismicnet.com/maillist.html for mo=
re=20
  information.