Directional Coupler

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This page last updated 01/26/2015


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.



Schematic: Directional Coupler.pdf
BOM:  RF Coupler BOM.pdf
Gerbers: Directional

Link to OSH Park:

NOTE:  The link to OSH Park also allow ordering PCBs