8:20
It would be noted from the beginning , however , that an impact equal to a hundred-ton explosion was a very small shock for the landing of a bolide . It would add to the plausibility of reported deceleration , though , and would arouse acute suspicion . Justly so . At 8:20 , Lockley called Sattell who was southeast of him . The measuring instruments used microwaves and gave readings of distance by counting cycles and reading phase differences . As a matter of convenience the microwaves could be modulated by a microphone , so the same instrument could be used for communication while measurements went on . But the microwaves were directed in a very tight beam .