Ham Radio General Class Practice Test

Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

1. It is required by FCC rules

2. It minimizes power consumption in the receiver

3. It improves impedance matching of the antenna

4. It results in the best signal to noise ratio

The correct answer is: It results in the best signal to noise ratio

Matching the receiver bandwidth to the bandwidth of the operating mode is essential because it results in the best signal-to-noise ratio. When the receiver bandwidth is aligned with the signal's bandwidth, the receiver is optimally tuned to capture the desired signal while effectively filtering out unwanted noise and interference. This optimization allows for more efficient reception of signals, enhancing clarity and intelligibility, especially in weaker signal conditions. When the bandwidth of the receiver is narrower or wider than necessary, it can either introduce extraneous noise (in the case of a broader bandwidth) or lose important signal components (in the case of a narrower bandwidth). Therefore, aligning the receiver's bandwidth with the specific characteristics of the operating mode ensures that only the relevant frequencies are processed, which significantly improves the clarity of the received signal relative to the background noise.