Radar antenna beam simulator

Claim 1

RADAR SIMULATION EQUIPMENT COMPRISING: (A) A CATHODE RAY TUBE FOR PRODUCING AN ELECTRON BEAM TRACE AND HAVING DEFLECTION MEANS, INTENSIFYING MEANS, AND A TUBE FACE; (B) A MASK, POSITIONED OVER THE TUBE FACE, AND HAVING AN OPAQUE PORTION AND A TRANSPARENT PORTION WITH VARYING DEGREES OF TRANSPARENCY, REPRESENTATIVE OF AN ANTENNA POWER PATTERN RELATIVE TO A HORIZONTAL REFERENCE PLANE; (C) MEANS FOR SUPPLYING A LINEAR TIME BASE SIGNAL SYNCHRONIZED WITH THE SIMULATED RADAR; (D) MEANS FOR SUPPLYING AN ANTENNA ALTITUDE SIGNAL; (E) MEANS FOR SUPPLYING AN ANTENNA PATTERN TILT SIGNAL RELATIVE TO THE REFERENCE PLANE; (F) RESOLVING MEANS CONNECTED TO THE DEFLECTION MEANS FOR RESOLVING SAID THREE SIGNALS TO DEFLECT THE ELECTRON BEAM TRACE ACROSS THE TUBE FACE PARALLEL TO THE REFERENCE PLANE BUT BELOW SAID PLANE A DISTANCE PROPORTIONAL TO THE ANTENNA ALTITUDE; (G) MEANS FOR PROVIDING A SIMULATED RADAR RETURN SIGNAL CONNECTED TO MODULATE THE INTENSIFYING MEANS WITH CHANGE IN RETURN SIGNAL; (H) PHOTOSENSITIVE MEANS FOR YIELDING AN OUTPUT SIGNAL PROPORTIONAL TO THE LIGHT TRANSMITTED BY THE BEAM TRACE THROUGH THE TRANSPARENT ANTENNA PATTERN POSITION OF THE MASK, AND (I) INDICATOR MEANS HAVING DISPLAY CIRCUITS SYNCHRONIZED WITH THE SIMULATED RADAR AND CONNECTED TO RECEIVE THE PHOTOSENSITIVE MEANS OUTPUT AND DISPLAY A REPRESENTATION OF A RADAR ECHO WHEN THE CATHODE RAY TUBE TRACE CROSSES THE TRANSPARENT PATTERN PORTION OF THE MASK BUT TO REMAIN BLANK CORRESPONSING TO THE RADAR TRAVEL TIME WHEN SAID TUBE TRACE CROSSES THE OPAQUE PORTION OF SAID MASK.