Broadcast FM receivers operating in the 88–108 MHz band typically use which standard intermediate frequency (IF)?

Introduction / Context:
In superheterodyne FM broadcast receivers, a fixed intermediate frequency (IF) simplifies filtering and demodulation. A widely adopted standard for VHF FM broadcast (88–108 MHz) is 10.7 MHz, balancing image rejection, selectivity, and practical filter technology (ceramic/LC filters).

Given Data / Assumptions:

• FM broadcast band: 88–108 MHz.
• Single conversion receiver assumed.
• Standard consumer designs.

Concept / Approach:

Choosing IF trades off image rejection (improved with higher IF) against achievable selectivity for a given Q. 10.7 MHz has emerged as a sweet spot: sufficiently high for reasonable image spacing and supported by abundant, standardized filters and demodulators.

Step-by-Step Solution:

Verification / Alternative check:

Commercial tuner ICs and service manuals consistently specify 10.7 MHz IF for FM broadcast reception.

Why Other Options Are Wrong:

• 8, 9.9, 12.2 MHz: not the standard for broadcast FM.
• 455 kHz: typical AM broadcast IF, not FM.

Common Pitfalls:

Confusing AM and FM IF standards or assuming IF equals one fixed world-wide value across all services.

Final Answer:

10.7 MHz