Ham Radio General Class Practice Test

What is an effect of placing an RFI filter on the power line of a radio?

1. Increased RF output

2. Reduced power consumption

3. Less noise from AC lines

4. Improved battery life

The correct answer is: Less noise from AC lines

Placing an RFI (Radio Frequency Interference) filter on the power line of a radio primarily serves to reduce noise from AC lines. These filters are designed to suppress and eliminate unwanted RF signals that can lead to interference, ensuring that the radio operates more efficiently and clearly. The interference can stem from various sources on the AC power lines, which can create noise that disrupts the radio's ability to receive and transmit signals accurately. By filtering this noise, the RFI filter enables better performance of the radio, enhancing audio clarity and overall communication quality. While alternatives such as increased RF output, reduced power consumption, and improved battery life might seem like potential benefits, they are not the primary functions or results of using an RFI filter. The critical role of the filter rests in its ability to mitigate external noise, making option C the correct and most relevant choice in this context.