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Higher Study | Communication Systems | Noise in Analog Communication System

In amplitude modulation:
White noise is that signal whose frequency spectrum
The noise level of 10 dB is how many times more powerful than the noise level of 1 dB
Which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?
Which of the following is not a primary source of external noise?
An unwanted signal that enters the transmitted signal which cannot be controlled is called as:
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