—_
4-39
distribution stations served experimenters in locations at both
atolls, including five shipboard stations operated by the rediosignal system for the underwater shots.
These stations are
listed in Table 1.
To provide greater flexibility,
the basic timing sys*’7 was
completely revised for this operation.
By means of @ pat:::.-
board on the sequence timer, as many as twenty-four separate
times could be selected at any half-minute interval from -60
minutes to -2 minutes.
and at any nalf-second interval from -2
minutes to # 1 seconc.
Tne selected times were transmitted to
the timing station over a single pair of wires as a series af
100-millisecond pulses.
Another patch-board on the timing
station decoder provided the means whereby any of the timing
signals received from the Control Point could be selected and
distributed to any number of users.
Two radio-tone timing signal systems supplemented the
hardwire systems at Eniwetok and Bikini by providing signals to
users in locations where hardwire signals were not feasible.
Separate radio-tone systems operated the major instrumentation
on the two underwater shots and on the high-altitude balloon
phot.
A similar system was installed at Johnston Island.
A
firing-tone transmitter furnished the signals for arming and
firing the two underwater devices,
Users requiring radio signalt
were supplied with EG&G Tone-receiver units, consisting of a
radio receiver,
a tone-sensitive relay system,
output relays for operating equipment.
and heavy-duty
To eliminate the possi-
bility of false triggering, two different audio tones were
transmitted Simultaneously for each timing signal.
«Poel/op
que
203
PAGE “7S