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Interesting, this, as it says on the RM3100 webpage "Measurements
are stable over temperature and inherently free of offset drift" and
a temperature coefficient is not even mentioned in the specs.<br>
<br>
David N1HAC<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/31/20 11:44 AM, Julius Madey via
TangerineSDR wrote:<br>
</div>
<blockquote type="cite" cite="mid:40807920-2f7e-f65a-9f72-b4481a981e1e@fairpoint.net">
<font face="Arial">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. <br>
<br>
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.<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 7/31/2020 10:26 AM, David Witten
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CABJ3BVMweyCCiXQQB-twSDwH4hQU-U0VEzRgHvYHSwW2Owfmbw@mail.gmail.com">
<div dir="ltr">Hyomin,
<div><br>
</div>
<div>I'm not certain what the next step should be. Julius is
hoping for further response from PNI on this subject. </div>
<div><br>
</div>
<div>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. </div>
<div>Calibration will hopefully give us more meaningful values
to begin with. </div>
<div>Insulation will dampen the effect of those behaviors over
short timespans.</div>
<div><br>
</div>
<div>Fortunately, neither requires changes in the basic
circuit, just adjustments to the data collection and device
packaging.</div>
<div><br>
</div>
<div>Dave</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jul 31, 2020 at 9:10
AM Kim, Hyomin <<a href="mailto:hmkim@njit.edu" moz-do-not-send="true">hmkim@njit.edu</a>> wrote:<br>
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<div dir="ltr">Hi Dave
<div>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? </div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>If the temperature compensation is the issue, I could
install insulations around the sensor. </div>
<div><br>
</div>
<div>Hyomin</div>
<div><br>
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<font color="#6f6f6f">Physics<br>
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