[TangerineSDR] Mag update?

[Julius Madey]

One more thought.  I've asked PNI for information both on temperature 
and supply voltage sensitivity, the only two variables I could think of 
besides the need to minimize local B fields due to currents in circuit 
board traces, nearby wiring, etc.

I did not find data on the temperature stability of the 3.3 volt 
regulator Dave's JJ board  is using but the regulator I used with the 
original adapter board Dave sent me has about 5 millivolts of change out 
of 3.3 volts between 25 and 50 C and Dave's is probably similar.  That 
doesn't seem like enough change to produce the observed variations but 
that information was given to PNI as well.


On 7/31/2020 10:26 AM, David Witten wrote:
> Hyomin,
>
> I'm not certain what the next step should be.  Julius is hoping for 
> further response from PNI on this subject.
>
> If temperature compensation does account for the differences in 
> observed response I would think that the important thing to  do may be 
> to find a way to calibrate out the discrepancy.  Then we can look at 
> insulation to further minimize the effect.
> Calibration will hopefully give us more meaningful values to begin with.
> Insulation will dampen the effect of those behaviors over short timespans.
>
> Fortunately, neither requires changes in the basic circuit, just 
> adjustments to the data collection and device packaging.
>
> Dave
>
> On Fri, Jul 31, 2020 at 9:10 AM Kim, Hyomin <hmkim at njit.edu 
> <mailto:hmkim at njit.edu>> wrote:
>
>     Hi Dave
>     Sorry that I've been out of the loop for a while as I was
>     completely caught up with something else. May I ask you what the
>     current status is?
>
>     I can visit Jenny Jump if there is something that I can do. At
>     this moment, I cannot think of anything that can be fixed from my
>     end.
>
>     If the temperature compensation is the issue, I could install
>     insulations around the sensor.
>
>     Hyomin
>
>
>
>     NJIT logo <https://www.njit.edu/> 	*Hyomin Kim*
>     Assistant Professor
>     Physics
>     Center for Solar-Terrestrial Research
>     Institute for Space Weather Sciences
>     hmkim at njit.edu <mailto:hmkim at njit.edu> • (973) 596-5704
>     https://web.njit.edu/~hmkim/
>     104 Tiernan Hall, 161 Warren Street, Newark, NJ 07102
>

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