Question
What sound is heard from an audio device experiencing RF interference from a CW transmitter?
Answer Options
- A) On-and-off humming or clicking
- B) A CW signal at a nearly pure audio frequency
- C) A chirpy CW signal
- D) Severely distorted audio
Correct Answer: A
Explanation
A Continuous Wave (CW) transmission consists of the transmitter being keyed on and off rapidly to create Morse code dots and dashes. When this radio frequency (RF) energy is picked up and rectified by a susceptible audio device, the device will respond to the rapid on-off pulsing of the RF carrier.
The resulting audible sound heard is on-and-off humming or clicking that corresponds directly to the CW transmission’s dots and dashes. This is a common symptom of RFI from a CW transmitter, as the device acts as a simple detector for the pulsed signal.
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