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Rotor system owners manual the ham iv is recommended for antenna arrays no larger than 15 square feet of wind surface area when tower mounted and 75 square feet of antenna wind surface area when mast mounted using. Repairing a cde hy gain mfj rotator key searchwords rotor repair fix rotor rotator repair fix rotator few things are more frustrating to a ham than an antenna rotator which fails it might be a failure to turn either partially or completely a failure to indicate the correct direction or an intermittent turning or indicating. Hy gain cde rotor lessons learned the hard way i have used ham series rotors for over 30 years now sometimes to turn some pretty big antennas these rotors are usually fairly inexpensive used at least as rotors go and if you dont have a large budget you can make them work provided you are careful to avoid some of their pitfalls. Norm uses this color code for cde telex hy gain rotors if i understood correctly they can give you and answer and will likely send you a wiring diagram i recently rebuilt a ham iv the iv and v are identical inside only the control box is different towertalk ham 3 rotor wiring jon pearl w4abc re towertalk ham 3 rotor