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3rd January 2003 | 06:04

#8 (permalink)

411A

Joined: Mar 2000

Posts: 8,571

Likes: 3

From: Arizona USA

Amplitude modulation is used with ATC communications because...
if two stations transmit at the same time, it is heard as "garbled", whereas if frequency modulation was used, only the stronger signal would be heard.
In short, 'tis a safety measure.