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  

http://michaelgellis.tripod.com/direct.html

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.

 

Documentation

Schematic: Directional Coupler.pdf
BOM:  RF Coupler BOM.pdf
Gerbers: Directional Coupler_08052014.zip
 

Link to OSH Park: https://oshpark.com/shared_projects/9u4trI7X

NOTE:  The link to OSH Park also allow ordering PCBs