📡
Frequency
403 MHz
Frequency
403 MHz
🧭
Range
401–430 MHz
Range
401–430 MHz
🧩
Band Group
UHF (300–1000 MHz)
Band Group
UHF (300–1000 MHz)
🌐 Summary
The 403 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: 403 MHz: Government, utilities, telemetry, PMR/DMR trunked systems; Radiosondes, meteorological aids; Handheld radios, vehicle radios, dispatch equipment; implant comms (pacemakers, neurostimulators).
403–406 MHz: meteorological aids (radiosondes), with satellite data collection nearby.
🔍 Explore the full RF Spectrum database
📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 0.744 |
| Waveforms | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 18.6 cm |
| Band Family | LMR/Public Safety |
| Band | UHF (Land mobile/Fixed) |
| Primary Common Name | Land mobile / Fixed allocation |
| FSPL @ 1 km [dB] | 84.546100922822 |
| FSPL @ 10 km [dB] | 104.54610092282 |
| Fresnel Radius @ 1 km (m) | 13.641601821199 |
| Band Group | UHF (300–1000 MHz) |
| Tax Band Family | UHF |
| Tax Band Class | UHF MetSat / MetAids |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | Government, utilities, telemetry, PMR/DMR trunked systems |
| Lower Neighbor Use | PPDR / TETRA (Land mobile) |
| Upper Neighbor Use | Amateur 70 cm band |
| Typical Services Devices | Radiosondes, meteorological aids |
| Market Common Devices | Handheld radios, vehicle radios, dispatch equipment |
| Refarming Use | No |
| Device Ecosystem Size | Medium |
| Device Hotspots (MHz) | 403 |
| Device Category | MedRadio / MICS |
| Typical Use Cases | implant comms (pacemakers, neurostimulators) |
| Modulation (Device) | FSK/QPSK (varies) |
| Channel Width (Device) [kHz] | ~300 |
| Device Region Profiles | Global allocations around 402–405 |
| Per-Region EIRP Or Duty (Device) | Extremely low EIRP; medical use only |
| Allocation Relevance (Device) | Medical implant allocation |
| Adjacent-Band Collision Risks (Device) | Protect from high-power nearby transmitters |
| Example Devices Or Skus | Military Communications |
| Common Protocols | Analog FM (12.5 kHz); DMR; P25 (region); TETRA (region) |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | – |
| Interference Notes | Protect sensitive receive systems |
| Compatibility Risk Notes | ≤5 MHz from Cospas–Sarsat |
| Notes | 403–406 MHz: meteorological aids (radiosondes), with satellite data collection nearby. |
| Propagation Notes | Strong coverage, good indoor penetration |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 401 |
| Upper Band Frequency Limit | 430 |
| EIRP Indoor Limits | Protected met‑aids |
| EIRP Outdoor Limits | Protected met‑aids |
| PSD Limit | — |
| Emission Mask Class | Met aids |
| Guardband Minimum [kHz] | 25 |
| Typical Bandwidths | 12.5, 25 kHz |
| Autocalculated Bandlimits | No |
| Typical Bandwidths (Estimated) | 12.5, 25 kHz |
| Max EIRP [dBm] | Extremely low EIRP; medical use only |
| Power Source Or Duty Profile (Typical) | Battery implants; external readers |
| 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: 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 | MedRadio (implant telemetry) |
🌎 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 | Licensed land mobile / fixed service |
| Primary Application | Government, utilities, telemetry, PMR/DMR trunked systems |
| Primary Services | – |
| Spurious Emission [dBm] | -30 (baseline) |
| Lower Neighbor Use | PPDR / TETRA (Land mobile) |
| Upper Neighbor Use | Amateur 70 cm band |
| Licensing Model | Licensed (MetAids) |
| Typical Services Devices | Radiosondes, meteorological aids |
| 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] | 13.641601821199 |
| Typical Bandwidths (Estimated) | 12.5, 25 kHz |
| Auction Status | Assigned |
| Refarming Use | No |
| Typical Site Spacing km | 4 / 12 |
| Device Ecosystem Size | Medium |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Device Hotspots (MHz) | 403 |
| Device Category | MedRadio / MICS |
| Typical Use Cases | implant comms (pacemakers, neurostimulators) |
| Typical Center Frequencies [MHz] | 402–405 |
| Rule Part (Fcc Or Region) | FCC Part 95 Subpart I; ETSI EN 301 839 |
| Modulation (Device) | FSK/QPSK (varies) |
| Channel Width (Device) [kHz] | ~300 |
| Device Region Profiles | Global allocations around 402–405 |
| Per-Region EIRP Or Duty (Device) | Extremely low EIRP; medical use only |
| Allocation Relevance (Device) | Medical implant allocation |
| Adjacent-Band Collision Risks (Device) | Protect from high-power nearby transmitters |
| Example Devices Or Skus | Military Communications |
| Antenna Form Factor (Typical) | ¼-wave ≈ 18.6 cm |
| Power Source Or Duty Profile (Typical) | Battery implants; external readers |
🛡️ Regulatory & Neighbors
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 401 |
| Upper Band Frequency Limit | 430 |
| Rx Blocking Min dBm | -15 (planning) |
| Lower Neighbor Use | PPDR / TETRA (Land mobile) |
| Upper Neighbor Use | Amateur 70 cm band |
| Lower Neighbor Band | PPDR / TETRA (Land mobile) |
| Lower Neighbor Range | 381.000–400.000 MHz |
| Upper Neighbor Label | Amateur 70 cm band |
| Upper Neighbor Range | 431.000–433.000 MHz |
| Adjacent-Band Collision Risks (Device) | Protect from high-power nearby transmitters |
| Real-World Range (Indoor/Outdoor) | In-body short range to reader |
| 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 | 381.000–400.000 MHz |
| Upper Neighbor Range | 431.000–433.000 MHz |
| Interference Notes | Protect sensitive receive systems |
| 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 |
| Real-World Range (Indoor/Outdoor) | In-body short range to reader |
| Antenna Form Factor (Typical) | ¼-wave ≈ 18.6 cm |
| Ecosystem Maturity | Established |
| 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 | MICS/MedRadio 10 channels |
| Security Features | proprietary + clinical safeguards |
| Lbt Or Fhss Requirement | LBT required; very low power |
| Popularity (Installed Base) | Medium |
| Coexistence Tips | Medical use; keep interference minimal |
| Latency Class | Low |
| Device Hotspots (Scoped && Tagged) | – |
