Before revision: I,FAA RD-69-12 STUDY OF TWO-FREQUENCY CAPTURE EFFECTS ON ILS RECEIVERS ` MARCH 1969 , Charles Manney , Wilcox, 1969.3.
After revision: I,FAA RD-69-12 STUDY OF TWO-FREQUENCY CAPTURE EFFECTS ON ILS RECEIVERS , Charles Manney , Wilcox,