[TangerineSDR] may have spoken too soon

[Julius Madey]

Latest results. Attached pdf. Two concatenated runMag runs with 
beginning of second 15 minutes after end of first with what appears to 
be a 'startup transient' of approximately an hour at the beginning of 
each run.  No idea what's causing that behavior; more testing under way 
with local i2c bus connection (no differential extension) on a second 
RM3100.  More testing participants needed.
Jules - K2KGJ

On 8/12/2020 3:14 PM, David Witten wrote:
> Jules,
>
> Very interesting!
>
> I'm curious what effect we might see burying the sensor completely, 
> say below the frostline:
>
> Frostline Map <https://www.hammerpedia.com/frost-line-map/>
>
> This would make deployment more difficult, but would surely provide 
> significant stability.
>
> But what does it do to magnetic field lines?  - one more experiment 
> that I would like to try sometime: place several sensors in a vertical 
> column at, say 500 cm intervals in a fairly uniform deposit of soil.
>
> Seismic interaction is something I hadn't considered.
>
> Dave
>
>
> On Wed, Aug 12, 2020 at 1:21 PM Julius Madey <hillfox at fairpoint.net 
> <mailto:hillfox at fairpoint.net>> wrote:
>
>     Dave,
>     Did a 13 hour run from 2300edt yesterday to noon today and then
>     started a second run to complete 24 hours.  Seeing a slight 0.3
>     degree upward shift in temp over the 13 hours. The sensor results
>     are not flat line and still show some drift with an initial
>     relatively rapid change after starting the run ... have to see if
>     the same thing happens on the run in progress now.
>     Some activity around 0400edt to 0900edt which I can't explain as
>     magnetic field shifts, at least according to the data from
>     Intermag.  Might be seismic activity related as any movement of
>     the sensor could also create a 'signal' in the low nT range  (~50nT).
>     Jules
>
>
>     On 8/12/2020 10:26 AM, David Witten wrote:
>>     Jules,
>>
>>     I will look closely at this when I get back from my appointment
>>     this am.  THere are definitely some untested 'features' here.
>>
>>     Dave
>>
>>     On Tue, Aug 11, 2020 at 9:49 PM Julius Madey
>>     <hillfox at fairpoint.net <mailto:hillfox at fairpoint.net>> wrote:
>>
>>         Dave,
>>         I think we're OK   operator error here with parameter formats
>>         ....
>>         Sorry for the false alarm
>>         Jules
>>
>

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