Target could be identified as being definitely smaller than a destroyer and probably larger than a landing boat. Submarine opened to 9,420 yards and closed to 8,630. Two destroyers were then observed on the screen closing on contact from East and South. Destroyer closing from East passed over location where contact abruptly disappeared when DD was 1,300 yards away. C. Radar Material.
Urgent consideration is recommended toward improving resistance to gunshock of all radar equipments.
SG radar relays chattered during firing and impaired operation at some of the most crucial moments. One SG high voltage rectifier tube was thrown out of its socket due to inadequate mounting. Door interlock chattered and opened time delay relay, rendering equipment inoperative for 60 second period of relay. Two fuses mounted inside train and indicator unit had their excessively small filaments broken, and had to be replaced by heavy fuses. Both panel fuses on the train and indicator unit caused some loss of operation due to burning of contact surfaces of fuse clips and fuses during gunshock.