While the Hawk Eye cable is fairly tough, a few customers have found it is no match for a lawn mower, weed whacker, or an occasional pesky squirrel. But, fortunately, fixing it isn't that hard to do.
You'll need a pair of wire cutters to trim the broken cable ends, a wire stripper & crimper, four Telephone 26-22 gauge butt connectors (available at most electronics and hardware stores), and electrician's tape.
Strip off about an inch of the black insulation from each cable end. There you will find four very small yellow, red, black, and white wires. Strip about a quarter inch of insulation off of these. Careful! This can be difficult as it is easy to cut through the entire wire. Using a "Quick Strip wire stripper" (Google it) makes it a snap though. Now slip each end of the bare wires into one of the butt connectors, and crimp. Seal everything with electrician's tape.