<div dir="ltr">Hi Jules,<div><br></div><div>Yes, I looked at 1.25, 1.5, 2.0 and 3.0 pipe. The 3.0 stuff is really too big, but swimming pool noodles (closed cell foam with a hole down the center fit nicely into it. But I don't see the advantage of using something that requires a post hol digger. I can't do it myself, and my lot is probably almost all 'clean fill' over weathered limestone. Too much work.</div><div><br></div><div>I found that extruded polyethylene foam insulation (meant for the outside of 1" pipe) fits very snugly into the 2 inch pipe. I don't know if that is needed at all, but it is cheap and available. I've also been playing with plugs and shims made from 2 inch polystyrene rigid (pink) foam. Again, cheap, workable, and available nearby.</div><div><span style="font-family:Arial"><br></span></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="font-family:Arial">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 </span>insure<span style="font-family:Arial"> identical environments for more accurate comparison of the two mags.</span></blockquote><div><br></div>Sounds worth a try. I'm happy to make any mods to the software that are needed to try this. It sounds like a good two for (almost) the price of one.<div><br></div><div>Thanks,</div><div><br></div><div>Dave Witten</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 1, 2020 at 3:00 PM Julius Madey <<a href="mailto:hillfox@fairpoint.net">hillfox@fairpoint.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<font face="Arial">Dave,<br>
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.<br>
\ <br>
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. <br>
<br>
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.<br>
<br>
Jules<br>
<br>
</font><br>
<div>On 11/1/2020 3:01 PM, David Witten
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hello all,
<div><br>
</div>
<div>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.</div>
<div>I have been testing boards against the known-good boards
returned to me by David McGaw. This has been very helpful. </div>
<div>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.</div>
<div>The 2 inch pipe fits nicely in the largest hole made by the
drill-based garden auger set I bought.</div>
<div>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.</div>
<div><br>
</div>
<div>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.</div>
<div>I'm sure that we badly want to know at least three things:</div>
<div>1) Inter-sensor variability in identical settings.</div>
<div>2) Inter-sensor variability in somewhat different
locations.</div>
<div>3) How do Scotties boards compare to the prototypes we
have.</div>
<div><br>
</div>
<div>I'd like to hear any suggestions folks feel we should
pursue.</div>
<div><br>
</div>
<div>Dave Witten, KD0EAG</div>
</div>
</blockquote>
<br>
</div>
</blockquote></div>