108 MHz – Frequency Band & Applications

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Frequency
108 MHz
🧭

Range
108–118 MHz
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Band Group
VHF (30–300 MHz)

🌐 Summary

The 108 MHz allocation is part of the VHF (30–300 MHz) spectrum. This range is used worldwide for critical applications that keep our communications and infrastructure running smoothly. On this page we highlight how each band is applied in real systems, from regulatory assignments to everyday devices. Our goal is to make spectrum data clear and practical for engineers, regulators, and enthusiasts alike.

Key uses of this band include: 108 MHz: Air traffic comms; FM radios, car radios.

Aeronautical radionavigation: ILS localizer & VOR (108–112 MHz).

 VHF Airband overview (Mobitex)
VHF Airband overview β€” Mobitex

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πŸ“‘ Band & Geometry key

Field Value
Wavelength (m) 2.778
Waveforms
Antenna Form Factor (Typical) ΒΌ-wave β‰ˆ 69.4 cm
Band Family Aeronautical
Band Aeronautical radionavigation (VOR/ILS)
Primary Common Name Aeronautical radionavigation (VOR/ILS)
FSPL @ 1 km [dB] 73.108475109739
FSPL @ 10 km [dB] 93.108475109739
Fresnel Radius @ 1 km (m) 26.351540822193
Band Group VHF (30–300 MHz)
Tax Band Family VHF
Tax Band Class VHF Airband

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🧩 Applications & Usage

Field Value
Primary Application
Lower Neighbor Use Broadcasting (FM)
Upper Neighbor Use Aeronautical mobile (R) (civil airband)
Typical Services Devices Air traffic comms
Market Common Devices FM radios, car radios
Refarming Use No
Device Ecosystem Size Medium
Device Hotspots (MHz) 100
Device Category FM Broadcast Receivers
Typical Use Cases
Modulation (Device) Broadcast FM (Receiver)
Channel Width (Device) [kHz] N/A (Receiver)
Device Region Profiles Global FM broadcast
Per-Region EIRP Or Duty (Device) Receiver-only (EIRP N/A)
Allocation Relevance (Device) High (broadcast)
Adjacent-Band Collision Risks (Device) Low: broadcast spacing rules apply
Example Devices Or Skus FM Radio Receiver
Common Protocols VHF AM Voice (8.33 kHz); VDL Mode 2 (select freqs)

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πŸ—’οΈ Notes

Field Value
Receiver Selectivity Notes
Interference Notes Critical safety communications
Compatibility Risk Notes Aviation-critical service nearby/in-band; In sensitive band: Aeronautical VHF (Airband); Sensitive service in adjacent block
Notes Aeronautical radionavigation: ILS localizer & VOR (108–112 MHz).
Propagation Notes Strong coverage, good indoor penetration

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βš™οΈ Technical Rules

Field Value
Lower Band Frequency Limit 108
Upper Band Frequency Limit 118
EIRP Indoor Limits Prohibited (ILS/VOR)
EIRP Outdoor Limits Prohibited (ILS/VOR)
PSD Limit
Emission Mask Class Aeronautical NAV (protected)
Guardband Minimum [kHz] 833
Typical Bandwidths ~150 kHz occupied
Autocalculated Bandlimits No
Typical Bandwidths (Estimated) ~150 kHz occupied
Max EIRP [dBm] Receiver-only (EIRP N/A)
Power Source Or Duty Profile (Typical)
Channelization Plan
Channelization
Guard Band Requirement
OOB Emission Limit [dBm/MHz] Ultra‑strict
Spurious Emission Limit (dBm) Ultra‑low
RX Blocking Min [dBm] -15 (planning)
Duplexing Half-duplex
Duplexing Information Half-duplex: narrowband / push-to-talk
Uplink Pairing
Downlink Pairing
Paired Band Info
Max EIRP [dBm]
Channelization Block Size 200 kHz FM channels
3GPP Band Number
Example 3GPP Bands
LTE Uplink Bands
LTE Downlink Bands
NR Uplink Bands
NR Downlink Bands
Guard Bands Β±100 kHz spacing
Protocol Or Standard

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🌎 Country Overrides

Field Value
Tax Service Category Other / Various
Tax License Type Safety-of-Life
Tax Regions Global / Varies
ITU Region 1 Aeronautical radionavigation
ITU Region 2 Aeronautical radionavigation
ITU Region 3 Aeronautical radionavigation
License Type Aeronautical service (licensed, safety-of-life protected)
Primary Application
Primary Services
Spurious Emission [dBm] Ultra‑low
Lower Neighbor Use Broadcasting (FM)
Upper Neighbor Use Aeronautical mobile (R) (civil airband)
Licensing Model Licensed (Aviation)
Typical Services Devices Air traffic comms
US FCC Alloc FM Broadcasting (47 CFR Part 73)–

CA IC Alloc FM Broadcasting (BETS/BPR)–

UK Ofcom Alloc FM Sound Broadcasting (87.5–108 MHz)–

US Ref 47 CFR Part 73 (FM)
Typical Bandwidths ~150 kHz occupied
Market Licensing Model Licensed (Broadcasting)
Market Common Devices FM radios, car radios
Fresnel Radius (1st, 1 km) [m] 26.351540822193
Typical Bandwidths (Estimated) ~150 kHz occupied
Auction Status
Refarming Use No
Typical Site Spacing km – / –
Device Ecosystem Size Medium
Traffic Load Share Coverage-heavy, low capacity share
Device Hotspots (MHz) 100
Device Category FM Broadcast Receivers
Typical Use Cases
Typical Center Frequencies [MHz]
Rule Part (Fcc Or Region)
Modulation (Device) Broadcast FM (Receiver)
Channel Width (Device) [kHz] N/A (Receiver)
Device Region Profiles Global FM broadcast
Per-Region EIRP Or Duty (Device) Receiver-only (EIRP N/A)
Allocation Relevance (Device) High (broadcast)
Adjacent-Band Collision Risks (Device) Low: broadcast spacing rules apply
Example Devices Or Skus FM Radio Receiver
Antenna Form Factor (Typical) ΒΌ-wave β‰ˆ 69.4 cm
Power Source Or Duty Profile (Typical)

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πŸ›‘οΈ Regulatory & Neighbors

Field Value
Lower Band Frequency Limit 108
Upper Band Frequency Limit 118
Rx Blocking Min dBm -15 (planning)
Lower Neighbor Use Broadcasting (FM)
Upper Neighbor Use Aeronautical mobile (R) (civil airband)
Lower Neighbor Band Broadcasting (FM)
Lower Neighbor Range 89.000–107.000 MHz
Upper Neighbor Label Aeronautical mobile (R) (civil airband)
Upper Neighbor Range 119.000–136.000 MHz
Adjacent-Band Collision Risks (Device) Low: broadcast spacing rules apply
Real-World Range (Indoor/Outdoor)
US FCC Alloc FM Broadcasting (47 CFR Part 73)FM Broadcasting (47 CFR Part 73)

CA IC Alloc FM Broadcasting (BETS/BPR)FM Broadcasting (BETS/BPR)

UK Ofcom Alloc FM Sound Broadcasting (87.5–108 MHz)FM Sound Broadcasting (87.5–108 MHz)

Regulatory References US: 47 CFR Part 73 (FM); CA: ISED BPR‑3 (FM Broadcasting); UK: UK FAT + Ofcom Broadcasting Code
Global Harmonization Regional
Crossborder Coordination High
Sharing Mechanism
Auction Status
Guard Or Pair

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πŸ“ˆ Market & Measurements

Field Value
Noise Floor -105 dBm (est.)
Interference Cases
Lower Neighbor Range 89.000–107.000 MHz
Upper Neighbor Range 119.000–136.000 MHz
Interference Notes Critical safety communications
Market Licensing Model Licensed (Broadcasting)
Market Commercial Value Medium (legacy broadcast)
Market Common Devices FM radios, car radios
Market Deployment Density Dense urban, nationwide
Noise Floor (Estimated) -105 dBm (est.)
Market Commercial Value (Estimated) Medium (legacy broadcast)
Ecosystem Maturity Emerging
Indoor Penetration Good
Known Interference No major interference issues noted
Device Ecosystem Size Medium
Real-World Range (Indoor/Outdoor)
Antenna Form Factor (Typical) ΒΌ-wave β‰ˆ 69.4 cm
Ecosystem Maturity Emerging
Device Ecosystem Size Medium
Chipset Availability Limited / TBD
Operator Deployments Limited operators
Technology Generations Deployed Multiple / TBD
Roaming Support
Traffic Load Share Coverage-heavy, low capacity share
Indoor Penetration Good
Known Interference No major interference issues noted
Occupancy Medium
Occupancy Bucket Pct 10–30%
Latency Profile
Common Channels Or Profiles
Security Features
Lbt Or Fhss Requirement
Popularity (Installed Base)
Coexistence Tips
Latency Class
Device Hotspots (Scoped && Tagged) –

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