AM allows multiple to talk and also allows edge-case signals to be received. FM and digital is way more sensitive to weak signals being washed out where as even a washed out AM carrier can often be picked out of the noise enough to realize someone has a problem.
AM allows multiple to talk and also allows edge-case signals to be received. FM and digital is way more sensitive to weak signals being washed out where as even a washed out AM carrier can often be picked out of the noise enough to realize someone has a problem.
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