e
-_—
gy:
i. AC and DC Blue Boxes were used throughout the operation to
provide experimenters with a zero signal of millisecond accuracy,
ee
4.5.3
Results
The timing system installed by TU-5 proved, on the whole, to be both
reliable and satisfactory. Approximately 1000 hardwire signals were delivered, and approximately 50 radio time signal receiving units were installed at remote locations.
Two major difficulties were encountered during the operation. The
first of these was operational and consisted of trouble experienced in maintaining wet batteries on the remote radio receivers. The development of
low power radio time signal receivers would eliminate this difficulty.
The second difficulty encountered was the inability of Fiducial Markers
and Blue Boxes to trigger during local rain storms in the area of these
units. This resulted in failure to obtain a World Time from the control
station for the MMMMshot. However, the Bureau of Standards
backs this measurement up, so that the failure was not critical.
;
'
_
.
The various other functions of TU-5 were performed as scheduled and
require no comment.
4.6
TASK UNIT 6, FIRING
TU-6 responsibilities consisted of arming and firing the nuclear
weapons and devices detonated during the operation. Two teams were provided so that arm and fire capabilities could be maintained at both atolls.
These teams worked in close liaison with TU-5 and the Weapon Assembly
Groups (TU-10, TU-11, and TU-12). The arm and fire activities were always performed with the aid of detailed check lists which enumerated each
operation and measurement necessary to accomplish the mission.
The work
was apportioned into four parts which consisted of the prearming tests, arming, firing, and disarming.
The prearming tests included visual inspection, functional checks, and
adjustments with the live equipment while connected in a simulated final ar-
rangement,
The interlocks in the fire line were checked in a positive and
negative manner.
All monitor lamps, meters, and recorders associated with
the arming and firing were checked for true indications and calibrations.
The arming was anywhere from 6 to 14 hr prior to firing time and
included the final connections and preparations. During the final prepara-~
tions a safe-separation timer, whose contacts completed the arm line, was
set to close 2 hr before zero time and open 4 hr later.
This provided a
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