DISPLAY CONTROL PANEL

Figure 3-17.—A PPI tactical symbology display. CRT CONTROL PANEL.— The CRT control panel contains the CRT, optional plotting board, and some of the controls for the console. The CRT displays tactical symbology as shown in figure 3-17. The CRT display of sensor data and symbology is controlled from the display control panel. DISPLAY CONTROL PANEL.— The display control panel is located to the right of the CRT and contains the switches and controls to regulate the CRT display as shown in figure 3-18. The BRIGHTNESS section of the panel contains a potentiometer to control the display of video, sweep, symbols, and range marks. It also contains the potentiometer to control the CRT focus, astigmatism, and the centering adjustments. Additionally, the display control panel contains the switches to select the radar, range of the radius of the CRT, select offset, and control symbol leaders. DATA ENTRY PANELS.— For data entry purposes, the console is equipped with a computer- controlled action entry panel (CCAEP), and may be equipped with either a 6 by 7 panel or category select switch panel, a digital data entry unit, or an optional alphanumeric keyboard and a trackball unit. Figure 3- 19 shows a console with the 6 by 7 panel and the alphanumeric keyboard. The trackball is recessed in the trackball well along with the ball tab enable, ball tab center, hook, and sequence pushbuttons. Computer-Controlled Action Entry Panel (CCAEP).— The computer-controlled action entry panel (CCAEP) provides greater flexibility than its predecessor, the mode roller. CCAEPS consist of 24 switches arranged in 4 rows of 6 as shown in figure 3-20. The bottom row of six switches has fixed labels and functions. Each of the remaining 18 switch positions has 48 possible labels, or functions, independently controlled by computer output data and an auxiliary LED indicator. The computer program controls the selection of a Figure 3-18.—A PPI display control panel. 3-14