This set of answers or output data is determined by the radar repairman for the particular set after he
alines the computer. After alining the computer, the repairman sets the beam separation to its normal
position (correct setting is indicated on the BEAM SEPARATION plate on the antenna). He then sets
each of the four problems into the computer and records the weapon location easting and northing.
These locations, along with the problems, are recorded in the radar log book.
Radar set ser no
Date of alinement
Computer ser no
Date of recorded output data
Weapon Output data
height Easting Northing
Figure 1, Computer accuracy check (dual beam).
Each day or every time the set is moved, the operator should perform the accuracy check and compare
his output data with the data entered in the log by the radar repairman. These data are also used in the
performance of equipment serviceability criteria (ESC) checks. The tolerances for the check results
compared to the logged output data are as follows:
(a) The error in easting or northing should not exceed 20 meters.
(b) The sum of the easting and northing errors should not exceed 36 meters.
The results of the check should be entered in the log book.
Check the set for dual-beam operation as follows:
(a) Emplace the radar, apply power, and turn on the transmitter. Set DUAL-SINGLE BEAM switch to
(b) Open the computer drawer, and close the INTERLOCK SHORT switch.
Note: The interlock short switch is located under a red cover in upper left corner of the
(c) Verify that the BEAM SEPARATION dial on the left side of the computer drawer reads the same as
the BEAM SEPARATION plate on the antenna.