📡
Frequency
139 MHz
Frequency
139 MHz
🧭
Range
137–144 MHz
Range
137–144 MHz
🧩
Band Group
VHF (30–300 MHz)
Band Group
VHF (30–300 MHz)
🌐 Summary
The 139 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: 139 MHz: NOAA/MetSat, space ops; Two-way radios, legacy comms equipment.
VHF‑High allocations vary (≈138–144 MHz): government/LMR and space operations in some regions.
🔍 Explore the full RF Spectrum database
📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 2.158 |
| Waveforms | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 54.0 cm |
| Band Family | MSS |
| Band | Meteorological-satellite / Space operation |
| Primary Common Name | Meteorological-satellite / Space operation |
| FSPL @ 1 km [dB] | 75.300296005082 |
| FSPL @ 10 km [dB] | 95.300296005082 |
| Fresnel Radius @ 1 km (m) | 23.227929108026 |
| Band Group | VHF (30–300 MHz) |
| Tax Band Family | VHF |
| Tax Band Class | VHF Band |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | – |
| Lower Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Upper Neighbor Use | 2 m Amateur Band (R1 core) |
| Typical Services Devices | NOAA/MetSat, space ops |
| Market Common Devices | Two-way radios, legacy comms equipment |
| Refarming Use | No |
| Device Ecosystem Size | Medium |
| Device Hotspots (MHz) | 139 |
| Device Category | Specialized Industrial / Scientific 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 | Specialized Industrial / Scientific Equipment |
| Common Protocols | – |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | – |
| Interference Notes | Protect weather satellites downlinks; avoid OOBE |
| Compatibility Risk Notes | Sensitive service in adjacent block; ≤5 MHz from Aeronautical VHF (Airband) |
| Notes | VHF‑High allocations vary (≈138–144 MHz): government/LMR and space operations in some regions. |
| Propagation Notes | Strong coverage, good indoor penetration |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 137 |
| Upper Band Frequency Limit | 144 |
| EIRP Indoor Limits | Restricted/protected |
| EIRP Outdoor Limits | Restricted/protected |
| PSD Limit | — |
| Emission Mask Class | MetSat/space ops protection |
| Guardband Minimum [kHz] | 25 |
| Typical Bandwidths | 25 kHz |
| Autocalculated Bandlimits | No |
| Typical Bandwidths (Estimated) | 25 kHz |
| Max EIRP [dBm] | Varies by regulation |
| Power Source Or Duty Profile (Typical) | – |
| Channelization Plan | – |
| Channelization | – |
| 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: narrowband / push-to-talk |
| 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 | Meteorological-satellite |
| ITU Region 2 | Meteorological-satellite |
| ITU Region 3 | Meteorological-satellite |
| License Type | Space / Meteorological satellite (licensed via ITU coordination) |
| Primary Application | – |
| Primary Services | – |
| Spurious Emission [dBm] | -30 (baseline) |
| Lower Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Upper Neighbor Use | 2 m Amateur Band (R1 core) |
| Licensing Model | Licensed (MetSat/Space) |
| Typical Services Devices | NOAA/MetSat, space ops |
| US FCC Alloc | -– |
| CA IC Alloc | -– |
| UK Ofcom Alloc | -– |
| US Ref | – |
| Typical Bandwidths | 25 kHz |
| Market Licensing Model | Exclusive Licensed |
| Market Common Devices | Two-way radios, legacy comms equipment |
| Fresnel Radius (1st, 1 km) [m] | 23.227929108026 |
| Typical Bandwidths (Estimated) | 25 kHz |
| Auction Status | Auctioned |
| Refarming Use | No |
| Typical Site Spacing km | – / – |
| Device Ecosystem Size | Medium |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Device Hotspots (MHz) | 139 |
| Device Category | Specialized Industrial / Scientific 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 | Specialized Industrial / Scientific Equipment |
| Antenna Form Factor (Typical) | ¼-wave ≈ 54.0 cm |
| Power Source Or Duty Profile (Typical) | – |
🛡️ Regulatory & Neighbors
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 137 |
| Upper Band Frequency Limit | 144 |
| Rx Blocking Min dBm | -15 (planning) |
| Lower Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Upper Neighbor Use | 2 m Amateur Band (R1 core) |
| Lower Neighbor Band | Aeronautical mobile (R) (civil airband) |
| Lower Neighbor Range | 119.000–136.000 MHz |
| Upper Neighbor Label | 2 m Amateur Band (R1 core) |
| Upper Neighbor Range | 144.000–146.000 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 | Exclusive licensed |
| Auction Status | Auctioned |
| Guard Or Pair | – |
📈 Market & Measurements
| Field | Value |
|---|---|
| Noise Floor | -105 dBm (est.) |
| Interference Cases | – |
| Lower Neighbor Range | 119.000–136.000 MHz |
| Upper Neighbor Range | 144.000–146.000 MHz |
| Interference Notes | Protect weather satellites downlinks; avoid OOBE |
| Market Licensing Model | Exclusive Licensed |
| Market Commercial Value | High |
| Market Common Devices | Two-way radios, legacy comms equipment |
| Market Deployment Density | High |
| Noise Floor (Estimated) | -105 dBm (est.) |
| Market Commercial Value (Estimated) | High |
| Ecosystem Maturity | Mature |
| Indoor Penetration | Good |
| Known Interference | No major interference issues noted |
| Device Ecosystem Size | Medium |
| Real-World Range (Indoor/Outdoor) | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 54.0 cm |
| Ecosystem Maturity | Mature |
| 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) | – |