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trigger device located in the primary cathode follower and connected
directly to the receiving antenna.
The 2 micro-second delay line was
added to permit the leading edge of the waveform to be recorded,
In order to establish a definite time relationship between the reception of the signal and the triggering of a given device such as a
counter or transmitter, a time marker pip, generated by the delay trigger from one of the oscilloscopes, is fed through the 2 micro-second delay
line and superimposed on the initial portion of the received waveform,
Procedure
All oscilloscopes are calibrated against a known frequency standard
for sweep linearity.
The cathode follower triggering system is set to trigger approxim-=
ately 6 db. above the noise level.
The vertical deflector of the oscill~
oscopes are set to receive the predicted field strength.
Results
Station A — Parry Island
Waveform traces were obtained on two oscilloscope photos and
the third oscilloscope failed to function properly.
The predicted field
strength was 43.0 volts per meter and the measured field strength was 17.0
volts per meter.
The waveform traces are of good quality.
Station B - Kwajalein
waveform traces were obtained on two oscilloscope photos and
the third failed to trigger.
The predicted field strength was 25.0 volts
per meter and the measured field strength was 6.8 volts per meter.
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