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Celwave Model 650190 Directional Coupler

Hello all,

I recently purchased a Celwave Model Directional Coupler at a local Hamfest. 
The unit is connected to a small enclosure with a pair of RGS-142 coax 
cables.  The enclosure has a pair of male SMA connectors and one DB-9 
connector.  A calibration data sheet at 406 MHz was included.  I was told it 
is rated for 200 watts.  It appears to be designed for cellular base station 

Is anyone familar with this device?  Is a schematic or any interface 
information available?  I can use the directional coupler as is but it would 
be neat to have forward and reflected power availble digitally.


Ken - K5GUU 
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