DATRON SYSTEMS <DTSI> SEES LOWER YEAR NET Datron Systems Inc said it expects to report a falloff in earnings for the year ended March 31 of about 25 pct from fiscal 1986 levels. In fiscal 1986, Datron earned 1,776,000 dlrs. The company said new orders for the year just ended, however, rose 50 pct to 26 mln dlrs, bringing backlog at year-end to 19 mln dlrs.