SUMMARY—THE DATA DISPLAY GROUP AN/YA-4(V)

designed to check particular functions of the display consoles and VSS. The display POFA is normally run on a group of consoles as part of the fault isolation process or as required by the planned maintenance system (PMS). The display POFA subtests will vary from system to system, depending on the equipment configuration of the display suite. There are, however, several common functions normally tested. Switch function codes are checked; test patterns of symbols are displayed; the trackball/ball tab coor- dinates are verified; and various panel operations are exercised. The display POFA is designed to com- pletely check all display capabilities. Display PEFT The display PEFT grouping of subtests is contained in the operational program. The display PEFT allows the operator or technician to verify the operation of a single console independent of the operational program in progress. The display PEFT subtests are similar to the display POFA. However, the range of subtests is more limited in the PEFT. The display PEFT is designed to be run on a console in the event a console malfunctions during normal operations. ELECTRONIC PLUG-IN CIRCUIT TEST SET Tactical display systems are equipped with an electronic plug-in circuit test set. The test set, shown in figure 3-26, provides the technician with the facilities to test and repair faulty plug-in assemblies used in the display suite equipments. The test set simulates normal operating conditions by providing operating power and loads to the assemblies under test. In addition, the test set provides test signals and monitoring facilities, which enable the technician to troubleshoot, test, and align faulty assemblies. Portable test equipment (oscil- loscopes, vacuum tube voltmeters, and so forth) is used in conjunction with the test set. SUMMARY—THE DATA DISPLAY GROUP AN/UYA-4(V) This chapter has introduced you to the Data Display Group AN/UYA-4(V). The following information summarizes the important points you should have learned. DATA DISPLAY GROUP— The purpose of any display system is to present a visual picture of the tactical situation. This allows the operator to make various decisions and take action. The heart of the display system is the plan position indicator (PPI), or display console. The PPI receives analog inputs from the ship’s sensors (radar and sonar), digital or tactical data from the CDS computer, and simulated data from the video signals simulator (VSS) and test message generator (TMG). The simulated data from the VSS can be used for system testing or operator training. SENSOR DATA DISTRIBUTION— Sensor data from the radar is received by the radar azimuth converter (RAC) and distributed to the PPIs by the radar data distribution switchboards. R A D A R A Z I M U T H C O N V E R T E R (RAC)— The RAC converts antenna position data to a form that the PPI can use. The azimuth data is sent to the PPI console as DC and DU pulse trains. The number of pulses in the pulse train represents the angle of the antenna, and the spaces between the pulses represent the range of the radar. R A D A R D A T A D I S T R I B U T I O N SWITCHBOARD (RDDS)— The RDDS provides amplifications of the radar video received from the radar and the azimuth data received from the RAC and distributes them to the PPI consoles. TACTICAL DATA DISTRIBUTION AND DISPLAY— Tactical data is data generated by the CDS computer. Tactical data can be symbol data or amplifying information about a symbol. Depending on the system installed on your ship, the tactical data may be distributed through several different routes. 3-22