Ham Radio General Class Practice Test

Why might a digital signal be overridden by an analogue interference signal?

1. Digital signals are inherently weak

2. Analogue signals have a broader frequency spectrum

3. Digital signals transmit data faster

4. Digital signals are more susceptible to delay

The correct answer is: Analogue signals have a broader frequency spectrum

A digital signal might be overridden by an analogue interference signal primarily because analogue signals have a broader frequency spectrum. This broader range allows analogue signals to occupy more of the frequency space, leading to a greater likelihood of interference. Analogue signals typically cover a continuous range of frequencies, which means they can generate noise across a wide bandwidth. When these signals overlap with the frequencies utilized by digital transmissions, they can disrupt or mask the digital signal. This interference can result in the digital signal losing integrity, making it difficult for receivers to accurately interpret the data being transmitted. In contrast, the other options highlight characteristics that do not directly relate to the ability of an analogue signal to interfere with a digital signal's transmission. For example, while digital signals can be weaker or faster, these attributes do not inherently make them more likely to be overridden by analogue signals. Delay susceptibility also doesn't directly contribute to the interference phenomenon in question, as it pertains more to timing than to the frequency overlap that causes interference.