
I have a new circuit board layout with room for mounting holes that I will build for use as an internal reference in the Spectrum Analyzer I am working on.

According to the readings on my oscilloscope the reference should be within 1 dBm of the desired -10 dBm. After setting the calibration values in the Arduino sketch for the power meter, the readings are consistently within .5dBm. Checking linearity with several in-line attenuators all readings were within 1dBm.
Without access to other calibrated standards, this is about as accurate as I can come up with, and should be accurate enough for checking most things an amateur would build.
Now to get back to the spectrum analyzer build.
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