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I originally set up this board to be a piece of test equipment to be used with the
RF_Power_Meter, but it is also useable for Pure Signal
Later found out it is very similar to the Elcraft CP-1 Coupler.
If you are interested in the theory you want Michael Ellis's page and his Excel spreadsheet
Note that the turns ratios are independent of power levels.
The core size, spacing and insulation determine the max power level.
For higher power a larger PCB and cores would be necessary.
Link to OSH Park: https://oshpark.com/shared_projects/9u4trI7X
NOTE: The link to OSH Park also allow ordering PCBs