The ANT ELEV knob is used to manually set the radar antenna elevation angle. Rotating the knob counter-clockwise (backward) from it's mechanically detented center causes the antenna scan center to move upward in elevation to a maximum of +60 degrees. Rotating the knob clockwise causes downward scan center movement to a maximum of -60 degrees.
In the ground map type radar modes, the antenna is positioned in elevation by the FCC using INS elevation data inputs. This value, however, is manually adjustable around the computed value via the ANT ELEV knob as previously described. The ANT ELEV knob may also be used to position the antenna elevation in air-to-air search modes, including SAM. The knob has no effect while the radar is in STT, FTT, GMTT, MTT (with a priority target), ACM or AGR modes.