Ham Radio General Class Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Boost your ham radio knowledge with our engaging questions and detailed explanations. Prepare effectively with our diverse study resources. Ready to ace the General Class exam?

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the purpose of the "notch filter" found on many HF transceivers?

To restrict the transmitter voice bandwidth
To reduce interference from carriers in the receiver passband
To eliminate receiver interference from impulse noise sources
To enhance the reception of a specific frequency on a crowded band

The correct answer is: To reduce interference from carriers in the receiver passband

The notch filter is designed specifically to reduce interference from unwanted signals, particularly from carriers that fall within the receiver's passband. When the notch filter is activated, it suppresses the amplitude of signals at a specific frequency, allowing the operator to more clearly receive and focus on other desired signals without the distraction of strong, potentially overwhelming interference. This capability is particularly useful in HF operations, where numerous signals can overlap and cause noise, making communication challenging. While other options might suggest different functions, such as restricting bandwidth or enhancing specific signals, the primary and distinct function of a notch filter is its ability to target and attenuate discrete tones without affecting the overall bandwidth of incoming signals, thereby improving the overall clarity of communication on the desired frequency.