 At a meeting of the Night Interception Committee on 2 May it was decided that the bomber threat was greater than submarines , and the decision was made to move 80 of the 140 ASV Mk . I transmitters to AI , adding to 70 being constructed by EKCO ( E.K. Cole ) . These would be turned into 60 IIIA 's and 40 IIIB 's . At a further meeting on 23 May , Tizard , perhaps prompted by comments from Director of Signals ( Air ) , suggested that the units were not suitable for operational use , especially due to low reliability , and should be confined to daylight training missions . 
