🔍 Key Concepts
• Harmonic radiation in radio transmitters and antennas
• The meaning of whole-number multiples of a fundamental frequency (2f, 3f, 4f, etc.)
• How proper tuning and filtering affect unwanted emissions
💭 Think About
• Look at each choice and ask: does this describe a defining property of harmonic radiation, or just something that may be true in some cases?
• Consider the relationship between a harmonic and the fundamental frequency: can a harmonic ever be lower than the fundamental?
• Think about why regulations limit spurious and harmonic emissions: what role do transmitter tuning and filters play in controlling them?
✅ Before You Answer
• Verify whether harmonics are always higher than the fundamental, or if that word "always" might be a trap.
• Check if harmonic radiation is by definition at integer (whole-number) multiples of a fundamental frequency.
• Decide whether transmitter tuning directly reduces harmonics or whether it mainly affects the power at the fundamental frequency and uses filters for harmonics.