the chamber and normal to the axis of the chamber.
angle was relatively flat as shown in Figure 2.6.
The integrated response over the 471 solid
From this curve it can be seen that the re-
sponse of the chamber was independent of energy within + 10 percent from 90 to 2,000 kev.
The radiation transducers for the rocket flights showed a range of sensitivities of 0.17 to
0.39 pulse/sec/r/hr when calibrated with a 4-curie point source of Co®, As noted above, the
sensitivity was reduced by 15 percent when the transducers were operated inside the rocket
ogive in a uniformly distributed radioactive field.
2.2.3 Launching Site, A launching revetment was constructed on Site How (10 to 18 miles
from the shot points). The revetment consisted of two concrete launching pads, each 100 feet
by 12 feet; an embankment to protect the launchers from possible water waves; and an instrument shelter.
Firing of the rockets was controlled by a sequence timer located in the instrument shelter.
The timer was armed by a minus 1-second signal provided by an Edgerton, Germeshausen and
TABLE 2.1
RANGE AND BEARINGS OF SHOT POINTS FROM RECEIVING
STATIONS AND LAUNCHING REVETMENT
Shot
Cherokee *
Zuni
Navajo
Tewa
Site How Launching
Revetment
Range
Bearing
92,3u0f
285%
76 ,800T
2325
55,600 Tf
2835
73,000 T
283¢
Site Nan Receiving
Station
Range
Bearing
116,000 ft
3025
70,800T
261%
8i,000T
308
97,100Tt
304t
APD 101 Receiving
Station
Range
Bearing
195,000 ¢
330 f
165,000 +
280t
160,000 T
315
200,000 t
310f
* Planned Ground Zero.
t Range, feet.
} Bearing, degrees.
Grier (EG&G) timing relay. Two blue boxes were arranged so that the timer wouldalso start
if one or both of the boxes were triggered by the bomb light. The timer started the local power
generators after the blast wave had passed, (The local power generators were left running when
the shelter was secured for Shot Cherokee and the shock wave stopped them; therefore, the
generators were started by the sequence timerafter passage of the shock wave for subsequent
shots.) turned on the long-wave transmitter, started the rocket telemeters, uncaged the rockets,
ignited the rocket flares, and fired the rockets. Power for all but the long-wave transmitter
was supplied by batteries.
The long-wave transmitter, a BC-610 AM transmitter operated at 2.545 Mc, was located at
the launching revetment and relayed the launching times of the rockets to telemetering receiving stations.
2.2.4 Receiving Stations. Duplicate receiving stations were set up at Site Nan and aboard
the USS Knudson (APD-101). Figure 2.7 shows the position of the receiving stations. Table
2.1 gives the range and bearing of the various ground zero locations from the launching revetment at Site How, the shipboard receiving station, and the Site Nan receiving station.
The two receiving stations were similar except that the one at Site Nan was unmannedat shot
time and was equipped with automatic timing equipment to operate the recording devices. The
basic equipment of the stations consisted of six Raymond Rosen 842-C FM telemetering receiv~ers, a R-390/Urr AM receiver tuned to 2.545 Mc, and an Ampex Model § 3530 seven-channel
tape recorder. Telemetering frequencies of 223, 224, 225, 226, 227, 228, and 239 Mc were
assigned, giving six channels and one spare. The six signais from the rocket telemeters were
detected and recorded on six of the channels. The launch signals from the BC-610 transmitter
at the launching site were recorded on the seventh channel. In addition to the basic information
18