Standard AM radio band: Standard Amplitude Modulation (AM) radio broadcasts are confined to which part of the electromagnetic spectrum?
Electronics and Communication Engineering
Radio Receivers
Difficulty: Easy
Choose an option
Answer
Correct Answer: Medium Frequency (MF)
Explanation
Introduction / Context:AM broadcasting is allocated to a specific frequency band by international spectrum regulations. This ensures compatibility of receivers and transmitters worldwide.
Given Data / Assumptions:
- Standard AM band covers 540 kHz to 1650 kHz.
- This falls within the Medium Frequency (MF) range of the electromagnetic spectrum (300 kHz–3 MHz).
Concept / Approach:
By definition, MF includes the broadcast AM band. Other ranges—HF, VHF, UHF—are used for shortwave, FM, and television respectively.
Step-by-Step Solution:
Check AM broadcast band limits: 540–1650 kHz.Compare with spectrum divisions: MF = 300 kHz–3 MHz.Clearly fits within MF range.Verification / Alternative check:
Regulatory documents (ITU) confirm AM broadcasting is in MF.
Why Other Options Are Wrong:
- HF: 3–30 MHz, shortwave broadcasting.
- VHF: 30–300 MHz, FM radio/TV.
- UHF: 300 MHz–3 GHz, TV, mobile.
- LF: below 300 kHz.
Common Pitfalls:
- Confusing AM broadcast band with Shortwave AM (HF).
Final Answer:
Medium Frequency (MF)