To address this, once a null was seen, the bearing operator turned on a sensing switch which connected a second antenna located slightly behind the main one.
2.
Instead, the time base was used simply to help ensure the bearing operator was looking at the same target as the range operator-the signal of interest would be somewhere close to centred.
3.
The bearing operator would then turn the entire receiver hut using a gear set connected to bicycle pedals, looking for the point when the signal disappeared, indicating that the target was now perfectly aligned between the two antennas.
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