recorder to record for 120 msec and then to be locked into the playback mode for the
duration of the life of the canister
Provisions were made to supply external power and simulate the commands for pre-
flight testing and calibration. In-flight power was supplied by Yardney Silver-Cells.
2.6 GROUND STATION
The ground station was designed primarily for Project 1.10 functions (Reference 4),
but was entirely adequate for the purposea of Project 2.7. During the playback period
of the Project 2.7 tape recorder, the telemeter receiver outputs were simultaneously
4.
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Detector Four Current.a
Figure 2.15 Detector 4, KBr, channel calibration curve.
recorded on an Ampex 800 tape recorder and run through a discriminator array into a
consolidated recording oscillograph.
The oscillograph record provided a quick look at
the data and the tape record was available for detailed processing of the data.
2.7 FORM AND ACCURACY OF DATA
With the exception of the initial rise of the neutron pulse, the data was to have been
obtained ag a series of pulses of variable spacing on the tape from the Ampex 800 in the
ground station. This would have been transcribed to film by deflection of an oscilloscope
trace with the output of the tape recorder and photographing the trace with a moving-film
camera. The pulse frequency could then be determined as a function of time, the electronic calibration curves could be used to find detector outputs, and the procedure outlined in Section 1.3 finally used to obtain the neutron source function. [t would be possible
to make an electronic pulse counter of sufficiently fast response to have graphed the pulse
32