ARRL Technician Practice Exam

What is a symptom of RF feedback in a transmitter or transceiver?

1. Clear and loud audio output

2. Reports of garbled, distorted, or unintelligible transmissions

3. High quality modulation

4. Reduced transmission range

The correct answer is: Reports of garbled, distorted, or unintelligible transmissions

The presence of RF feedback in a transmitter or transceiver typically manifests as reports of garbled, distorted, or unintelligible transmissions. This phenomenon occurs when RF energy from the output of the transmitter is fed back into the microphone or audio input circuit. Such feedback can cause the audio signals to become altered and result in poor modulation. Users on the receiving end may hear these transmissions as distorted or unclear, making it difficult for them to comprehend the information being transmitted. In contrast, clear and loud audio output indicates that the system is functioning properly without issues of feedback. High-quality modulation suggests that the audio being transmitted is well-defined and free from interference, while reduced transmission range could be caused by various factors unrelated to RF feedback, such as equipment settings or antenna problems. Understanding these differences helps radio operators diagnose issues effectively and maintain clear and effective communication.