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5
Doppler spreading is the change in received frequency from a distance transmitter due to the rise and fall of the ionosphere along the signal path. When the effective height of the ionosphere rises, this lengthens the path and causes the received frequency to drop; when it falls the path decreases and the frequency rises.
You can measure this frequency ...
4
Probably ease of detection, or using the known OOK signal as kind of a frequency-synchronization and rate-synchronization method.
It's hard to tell – in low-power and least-cost electronics, the emphasis often is not on RF signal optimality, but in ease of production and power usage, things you won't find out without knowing the silicon design process.
It ...
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