📡
Frequency
309 MHz
Frequency
309 MHz
🧭
Range
300–330 MHz
Range
300–330 MHz
🧩
Band Group
UHF (300–1000 MHz)
Band Group
UHF (300–1000 MHz)
🌐 Summary
The 309 MHz allocation is part of the UHF (300–1000 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: 309 MHz: Government, public safety, commercial land mobile; fixed links; Land mobile, Fixed; UHF AM comms, datalinks; Handheld radios, vehicle radios, dispatch equipment.
UHF military aeronautical band (225–400 MHz): AM air‑to‑air/ATC; some segments host UHF SATCOM links.
🔍 Explore the full RF Spectrum database
📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 0.971 |
| Waveforms | FM/PM, digital PMR, telemetry (varies) |
| Antenna Form Factor (Typical) | ¼-wave ≈ 24.3 cm |
| Band Family | LMR/Public Safety |
| Band | UHF low (Land mobile/Fixed) |
| Primary Common Name | Land mobile / Fixed allocation |
| FSPL @ 1 km [dB] | 82.239169588497 |
| FSPL @ 10 km [dB] | 102.2391695885 |
| Fresnel Radius @ 1 km (m) | 15.578966818109 |
| Band Group | UHF (300–1000 MHz) |
| Tax Band Family | UHF |
| Tax Band Class | VHF/UHF Band |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | Government, public safety, commercial land mobile; fixed links |
| Lower Neighbor Use | Aeronautical mobile (OR) (military air) |
| Upper Neighbor Use | Aeronautical radionavigation / Radiolocation (UHF) |
| Typical Services Devices | UHF AM comms, datalinks |
| Market Common Devices | Handheld radios, vehicle radios, dispatch equipment |
| Refarming Use | No |
| Device Ecosystem Size | Medium (100–1000 models) |
| Device Hotspots (MHz) | 309 |
| Device Category | Avionics / Radar Equipment |
| Typical Use Cases | – |
| Modulation (Device) | Varies by device |
| Channel Width (Device) [kHz] | Varies |
| Device Region Profiles | Varies by country / allocation |
| Per-Region EIRP Or Duty (Device) | Varies by regulation |
| Allocation Relevance (Device) | Medium |
| Adjacent-Band Collision Risks (Device) | Low–Moderate |
| Example Devices Or Skus | Radar Altimeters, Military Radar |
| Common Protocols | Analog FM (12.5 kHz); DMR; P25 (region); TETRA (region) |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | – |
| Interference Notes | Coordination with civil allocations at edges |
| Compatibility Risk Notes | – |
| Notes | UHF military aeronautical band (225–400 MHz): AM air‑to‑air/ATC; some segments host UHF SATCOM links. |
| Propagation Notes | Strong coverage, good indoor penetration |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 300 |
| Upper Band Frequency Limit | 330 |
| EIRP Indoor Limits | N/A (licensed; verify national rules) |
| EIRP Outdoor Limits | N/A (licensed; verify national rules) |
| PSD Limit | — |
| Emission Mask Class | Generic (planning) |
| Guardband Minimum [kHz] | 100 |
| Typical Bandwidths | 12.5, 25 kHz |
| Autocalculated Bandlimits | No |
| Typical Bandwidths (Estimated) | 12.5, 25 kHz |
| Max EIRP [dBm] | Varies by regulation |
| Power Source Or Duty Profile (Typical) | – |
| Channelization Plan | 12.5, 25 kHz |
| Channelization | Varies by national regulator |
| Guard Band Requirement | – |
| OOB Emission Limit [dBm/MHz] | -13 (baseline) |
| Spurious Emission Limit (dBm) | -30 (baseline) |
| RX Blocking Min [dBm] | -15 (planning) |
| Duplexing | Half-duplex |
| Duplexing Information | Half-duplex: push-to-talk / single-frequency |
| Uplink Pairing | – |
| Downlink Pairing | – |
| Paired Band Info | – |
| Max EIRP [dBm] | – |
| Channelization Block Size | – |
| 3GPP Band Number | |
| Example 3GPP Bands | – |
| LTE Uplink Bands | – |
| LTE Downlink Bands | – |
| NR Uplink Bands | – |
| NR Downlink Bands | – |
| Guard Bands | – |
| Protocol Or Standard | – |
🌎 Country Overrides
| Field | Value |
|---|---|
| Tax Service Category | Other / Various |
| Tax License Type | Licensed / Service-Specific |
| Tax Regions | Global / Varies |
| ITU Region 1 | Land mobile, Fixed |
| ITU Region 2 | Land mobile, Fixed |
| ITU Region 3 | Land mobile, Fixed |
| License Type | Land mobile / Fixed service (licensed, public safety/commercial) |
| Primary Application | Government, public safety, commercial land mobile; fixed links |
| Primary Services | Land mobile, Fixed |
| Spurious Emission [dBm] | -30 (baseline) |
| Lower Neighbor Use | Aeronautical mobile (OR) (military air) |
| Upper Neighbor Use | Aeronautical radionavigation / Radiolocation (UHF) |
| Licensing Model | Licensed (Military aeronautical) |
| Typical Services Devices | UHF AM comms, datalinks |
| US FCC Alloc | -– |
| CA IC Alloc | -– |
| UK Ofcom Alloc | -– |
| US Ref | – |
| Typical Bandwidths | 12.5, 25 kHz |
| Market Licensing Model | Government / Public Safety |
| Market Common Devices | Handheld radios, vehicle radios, dispatch equipment |
| Fresnel Radius (1st, 1 km) [m] | 15.578966818109 |
| Typical Bandwidths (Estimated) | 12.5, 25 kHz |
| Auction Status | Assigned |
| Refarming Use | No |
| Typical Site Spacing km | 4 / 12 |
| Device Ecosystem Size | Medium (100–1000 models) |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Device Hotspots (MHz) | 309 |
| Device Category | Avionics / Radar Equipment |
| Typical Use Cases | – |
| Typical Center Frequencies [MHz] | – |
| Rule Part (Fcc Or Region) | – |
| Modulation (Device) | Varies by device |
| Channel Width (Device) [kHz] | Varies |
| Device Region Profiles | Varies by country / allocation |
| Per-Region EIRP Or Duty (Device) | Varies by regulation |
| Allocation Relevance (Device) | Medium |
| Adjacent-Band Collision Risks (Device) | Low–Moderate |
| Example Devices Or Skus | Radar Altimeters, Military Radar |
| Antenna Form Factor (Typical) | ¼-wave ≈ 24.3 cm |
| Power Source Or Duty Profile (Typical) | – |
🛡️ Regulatory & Neighbors
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 300 |
| Upper Band Frequency Limit | 330 |
| Rx Blocking Min dBm | -15 (planning) |
| Lower Neighbor Use | Aeronautical mobile (OR) (military air) |
| Upper Neighbor Use | Aeronautical radionavigation / Radiolocation (UHF) |
| Lower Neighbor Band | Aeronautical mobile (OR) (military air) |
| Lower Neighbor Range | 226.000–300.000 MHz |
| Upper Neighbor Label | Aeronautical radionavigation / Radiolocation (UHF) |
| Upper Neighbor Range | 331.000–380.000 MHz |
| Adjacent-Band Collision Risks (Device) | Low–Moderate |
| Real-World Range (Indoor/Outdoor) | – |
| US FCC Alloc | — |
| CA IC Alloc | — |
| UK Ofcom Alloc | — |
| Regulatory References | US: -; CA: -; UK: – |
| Global Harmonization | Regional |
| Crossborder Coordination | High |
| Sharing Mechanism | – |
| Auction Status | Assigned |
| Guard Or Pair | – |
📈 Market & Measurements
| Field | Value |
|---|---|
| Noise Floor | -110 dBm (est.) |
| Interference Cases | – |
| Lower Neighbor Range | 226.000–300.000 MHz |
| Upper Neighbor Range | 331.000–380.000 MHz |
| Interference Notes | Coordination with civil allocations at edges |
| Market Licensing Model | Government / Public Safety |
| Market Commercial Value | Low |
| Market Common Devices | Handheld radios, vehicle radios, dispatch equipment |
| Market Deployment Density | Medium |
| Noise Floor (Estimated) | -110 dBm (est.) |
| Market Commercial Value (Estimated) | Low |
| Ecosystem Maturity | Established |
| Indoor Penetration | Good |
| Known Interference | No major interference issues noted |
| Device Ecosystem Size | Medium (100–1000 models) |
| Real-World Range (Indoor/Outdoor) | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 24.3 cm |
| Ecosystem Maturity | Established |
| Device Ecosystem Size | Medium (100–1000 models) |
| Chipset Availability | Specialized vendors (Motorola, Airbus) |
| Operator Deployments | Regional/national public safety agencies |
| Technology Generations Deployed | LMR / TETRA digital voice |
| Roaming Support | No |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Indoor Penetration | Good |
| Known Interference | No major interference issues noted |
| Occupancy | Varies by region/time |
| 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) | – |
