[TangerineSDR] new tests of PNI RM3100

[Julius Madey]

All,
The attached PDFs document a 4.5 hour run with the underground mounted 
RM3100 to achieve near constant temperature during a run. The voltage 
regulator on the Dave's 0.0.10 remote adapter board was changed to an 
AP2210 ultralow dropout type with a 3.0 volt output voltage which 
matches the specified test voltage in the RM3100 data sheet and is well 
within both the MCP9808 precision temperature sensor and the PCA9615 
differential i2c extender. This modification substantially increases the 
margin for voltage drop in long cable runs.  The modification is trivial 
and uses the same solder pads as the original 1117 regulator.

The data plots are primarily for Hyomin.  There appears to be a 
correlation between the X and Y axis plots and the reported values for 
the Fredericksburg magnetic observatory on the Intermagnet site around 
0400UTC.  Hyomin, can you check Jenny Jump during that same interval; NJ 
is closer to me than Fredericksburg.  I currently have another run going 
which should show some of the higher dB activity since then if the 
earlier recording is not just coincidental.

Another question for Hyomin; is there value in doing a test with two 
RM3100's, perhaps within 100 feet of each other as a check on uniformity 
of response?

Jules Madey-K2KGJ



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