Quote:
I assumed it was to wake up a sleepy operator.
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Often found that the operator didn't need a wake-up call. How many times have you been sitting there, feet up on the desk reading a lurid novel with the cacophony of 5 ton from the English Channel in your headset, when suddenly you perk up - someone sent my callsign! There must be a small portion of brain filtering all that noise and just picking out the call - how does it do that?