[TangerineSDR] Magnetometer Testing

[Julius Madey]

Dave,
2 inch PVC is fine .... I chose the 1 1/4 inch because it was a good fit 
for your boards.  2 inch gives you more clearance to work also.  I have 
the same auger set and it works well ... my 1/2 inch cordless drill with 
extended handles for leverage when hitting stones is a big help.
\
The earlier email was relative to the pair of mounted mags I had 
intended to send to Hyomin using your original boards.  I could still 
fab that or wait until I get a couple of Scotty's boards or perhaps Gil 
would like to make his own ..... whatever works to get things moving ... 
I'll wait for Hyomin to decided what works best for him.

What is your opinion on cascading two mags on two of the new boards with 
different i2c addressing for the two?   My intent here is to get the two 
mags as physically close as possible without interaction to insure 
identical environments for more accurate comparison of the two mags.

Jules


On 11/1/2020 3:01 PM, David Witten wrote:
> Hello all,
>
> I apologise for not being very responsive lately.  I have been 
> plodding along slowly, but some days have been much better than others 
> for getting stuff done.
> I have been testing boards against the known-good boards returned to 
> me by David McGaw.  This has been very helpful.
> I have been working on containment like Jules is using, but I'm using 
> 2 inch Schedule 40 white PVC pipe and fittings.  I'm using this 
> because Scottie's magnetometer board is wider than any of the early 
> prototypes, and I'm hoping this will serve for all cases.  I'm eager 
> for any discussion on what the 'standard' should be.  I hate to 
> deviate from what jules is using, but somehow it seems inevitable.  I 
> hope that this is not an impediment to getting comparable results.
> The 2 inch pipe fits nicely in the largest hole made by the 
> drill-based garden auger set I bought.
> The first hole I have made is about 2 meters (maybe less) from the 
> foundation of my house.  I will need to get someone to help me when I 
> put a hole at the full distance from my house, because my lot is 
> currently too steep for me to navigate.  At that point, my 
> installation will also be in shaded woods.
>
> My feeling is that we should get as many of these in the ground and 
> measuring as possible, especially in situations where we can compare 
> the measurements apples to apples.
> I'm sure that we badly want to know at least three things:
> 1) Inter-sensor variability in identical settings.
> 2) Inter-sensor variability in somewhat different locations.
> 3) How do Scotties boards compare to the prototypes we have.
>
> I'd like to hear any suggestions folks feel we should pursue.
>
> Dave Witten, KD0EAG

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