Amateur Extra › E4 Amateur Practices › E4E05
E4E05
What is used to suppress radio frequency interference from a line-driven AC motor?
Pick an answer to check it.
Answer: B. A brute-force AC-line filter in series with the motor's power leads
A brute-force AC-line filter in series with the motor's power leads keeps RF noise from the motor off the power line. A high-pass filter would pass the RF noise instead of stopping it.
Tip: Brute-force filter on the motor leads.