📡
Frequency
1790 MHz
Frequency
1790 MHz
🧭
Range
1780–1805 MHz
Range
1780–1805 MHz
🧩
Band Group
Guard Band (FDD transition)
Band Group
Guard Band (FDD transition)
🌐 Summary
The 1790 MHz allocation is part of the Guard Band (FDD transition) 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: Guard band / transition zone between AWS-3 uplink (1755-1780 MHz) and DCS-1800/Band 3 downlink (1805-1880 MHz). Essential for preventing interference in FDD cellular systems. Minimal authorized use; strict emission restrictions apply. Used globally with regional variations (Europe: 20 MHz, 1785-1805 MHz)..
Guard band / transition zone between AWS-3 uplink and Band 3 downlink; minimal active use
(Mobitex)
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📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 0.16748182011173 |
| Waveforms | N/A – guard band; limited use subject to emission restrictions |
| Antenna Form Factor (Typical) | N/A – guard band; minimal equipment deployed |
| Band Family | Guard Band (cellular FDD transition 1780-1805 MHz) |
| Band | L‑Band |
| Primary Common Name | FDD Transition Guard (Uplink→Downlink) |
| FSPL @ 1 km [dB] | 97.51 |
| FSPL @ 10 km [dB] | 117.51 |
| Fresnel Radius @ 1 km (m) | 6.471 |
| Band Group | Guard Band (FDD transition) |
| Tax Band Family | Cellular (AWS-3 / IMT uplink) |
| Tax Band Class | 1781 to 1804 MHz Cellular (AWS-3 / IMT uplink) (Mobitex) |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | Inter‑band guard / isolation zone between uplink and downlink allocations |
| Lower Neighbor Use | Mobile uplink (1755–1780 MHz) |
| Upper Neighbor Use | Mobile downlink (Band 3) 1805–1850 MHz |
| Typical Services Devices | Guard band – minimal equipment; may permit low-power telemetry, coordination systems (region-specific) |
| Market Common Devices | Minimal – guard band; some low-power telemetry or coordination systems where permitted |
| Refarming Use | N/A – guard band maintained for interference protection |
| Device Ecosystem Size | Minimal – guard band with restricted use |
| Device Hotspots (MHz) | N/A – guard band |
| Device Category | Limited – guard band; restricted low-power devices where regionally permitted |
| Typical Use Cases | Guard band / transition zone; interference protection between uplink and downlink services; limited low-power uses where permitted |
| Modulation (Device) | N/A – guard band; any use subject to strict emission limits |
| Channel Width (Device) [kHz] | N/A – guard band |
| Device Region Profiles | N/A – guard band varies by regional FDD band plans |
| Per-Region EIRP Or Duty (Device) | Strict emission limits; typically -60 to -70 dBm/MHz |
| Allocation Relevance (Device) | N/A – guard band (devices not designed for this band) |
| Adjacent-Band Collision Risks (Device) | N/A – guard band exists to prevent adjacent band interference |
| Example Devices Or Skus | N/A – guard band (no commercial devices) |
| Common Protocols | N/A – guard band with emission restrictions |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | High selectivity (≥60 dB rejection across 1559–1610 MHz) |
| Interference Notes | Expect uplink UE emissions; band-edge masks and coordination protect adjacent services. Local rules vary by region. |
| Compatibility Risk Notes | 0 |
| Notes | Guard band / transition zone between AWS-3 uplink and Band 3 downlink; minimal active use |
| Propagation Notes | Similar to adjacent cellular bands; not actively used for propagation |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 1780 |
| Upper Band Frequency Limit | 1805 |
| EIRP Indoor Limits | Restricted – guard band; emissions subject to out-of-band and spurious limits |
| EIRP Outdoor Limits | Restricted – guard band; strict emission masks to protect adjacent services |
| PSD Limit | Strict emission masks apply; typically -70 dBm/MHz or lower for out-of-band |
| Emission Mask Class | Guard band – strict emission limits to protect adjacent services |
| Guardband Minimum [kHz] | N/A – receive-only band |
| Typical Bandwidths | 12.5 kHz–5 MHz (system‑dependent) |
| Autocalculated Bandlimits | 0 |
| Typical Bandwidths (Estimated) | 12.5 kHz–5 MHz (system‑dependent) |
| Max EIRP [dBm] | Strict emission limits; typically -60 to -70 dBm/MHz |
| Power Source Or Duty Profile (Typical) | Receiver‑side only; duty driven by application (tracking vs. timing holdover). |
| Channelization Plan | N/A – guard band with emission restrictions |
| Channelization | N/A – guard band with emission restrictions and coordination requirements |
| Guard Band Requirement | Entire 1781-1804 MHz range serves as guard; strict emission limits to protect adjacent services |
| OOB Emission Limit [dBm/MHz] | -60 to -70 dBm/MHz (strict limits to protect adjacent FDD services) |
| Spurious Emission Limit (dBm) | ≤ -60 dBm/MHz (guard band protection of adjacent uplink/downlink) |
| RX Blocking Min [dBm] | N/A – passive receiver |
| Duplexing | Guard / N/A |
| Duplexing Information | Downlink (space‑to‑Earth) |
| Uplink Pairing | N/A – guard band between FDD uplink (below) and downlink (above) |
| Downlink Pairing | |
| Paired Band Info | N/A – guard band between paired FDD services (not itself paired) |
| Max EIRP [dBm] | Highly restricted – typically <-60 dBm/MHz to maintain guard function |
| Channelization Block Size | Operator carriers (kHz–MHz) |
| 3GPP Band Number | |
| Example 3GPP Bands | N/A – guard band between 3GPP uplink and downlink allocations |
| LTE Uplink Bands | N/A – guard band |
| LTE Downlink Bands | N/A – guard band |
| NR Uplink Bands | N/A – guard band |
| NR Downlink Bands | N/A – guard band |
| Guard Bands | Entire 1781-1804 MHz range functions as guard band between uplink and downlink |
| Protocol Or Standard | Emission mask standards; ITU-R recommendations for guard bands |
🌎 Country Overrides
| Field | Value |
|---|---|
| Tax Service Category | Mobile (IMT) |
| Tax License Type | Licensed IMT spectrum with regional coordination and emission masks; federal/military sharing where applicable |
| Tax Regions | Widely used for IMT uplink in many regions; exact band plans and pairing vary by country |
| ITU Region 1 (Europe, Africa, Middle East (west of Persian Gulf), Western Russia & Mongolia) | Mobile / Fixed |
| ITU Region 2 (North America, South America, Central America, Caribbean, Greenland, Eastern Pacific Islands (Americas region)) | Mobile / Fixed |
| ITU Region 3 (Asia, Australia, Pacific Islands, Oceania, Indian Subcontinent, East Asia & Southeast Asia) | Mobile / Fixed |
| License Type | Licensed – edge/guard constraints apply (region‑specific) |
| Primary Application | Inter‑band guard / isolation zone between uplink and downlink allocations |
| Primary Services | Protection of adjacent FDD services; telemetry/coordination where permitted |
| Spurious Emission [dBm] | ≤ -60 dBm/MHz (guard band protection of adjacent uplink/downlink) |
| Lower Neighbor Use | Mobile uplink (1755–1780 MHz) |
| Upper Neighbor Use | Mobile downlink (Band 3) 1805–1850 MHz |
| Licensing Model | Restricted use / guard band; subject to adjacent band coordination and emission limits |
| Typical Services Devices | Guard band – minimal equipment; may permit low-power telemetry, coordination systems (region-specific) |
| US FCC Alloc | Guard band / restricted use; part of Mobile allocation with strict emission limits– |
| CA IC Alloc | Guard band / restricted; part of Mobile allocation with coordination requirements– |
| UK Ofcom Alloc | Guard band / restricted; transition zone between uplink and downlink– |
| US Ref | 47 CFR Part 27 (guard band provisions); ITU-R SM.1541 (unwanted emissions) |
| Typical Bandwidths | 12.5 kHz–5 MHz (system‑dependent) |
| Market Licensing Model | Generally unlicensed/restricted; guard band between licensed mobile services |
| Market Common Devices | Minimal – guard band; some low-power telemetry or coordination systems where permitted |
| Fresnel Radius (1st, 1 km) [m] | 6.471 |
| Typical Bandwidths (Estimated) | 12.5 kHz–5 MHz (system‑dependent) |
| Auction Status | N/A – guard band between licensed mobile services |
| Refarming Use | N/A – guard band maintained for interference protection |
| Typical Site Spacing km | 0.5–2 km (typical macro) / 2–10 km (typical macro) |
| Device Ecosystem Size | Minimal – guard band with restricted use |
| Traffic Load Share | N/A – guard band (minimal traffic) |
| Device Hotspots (MHz) | N/A – guard band |
| Device Category | Limited – guard band; restricted low-power devices where regionally permitted |
| Typical Use Cases | Guard band / transition zone; interference protection between uplink and downlink services; limited low-power uses where permitted |
| Typical Center Frequencies [MHz] | N/A – guard band (no operating frequencies) |
| Rule Part (Fcc Or Region) | Guard band provisions in adjacent band regulations (FCC Part 27, etc.) |
| Modulation (Device) | N/A – guard band; any use subject to strict emission limits |
| Channel Width (Device) [kHz] | N/A – guard band |
| Device Region Profiles | N/A – guard band varies by regional FDD band plans |
| Per-Region EIRP Or Duty (Device) | Strict emission limits; typically -60 to -70 dBm/MHz |
| Allocation Relevance (Device) | N/A – guard band (devices not designed for this band) |
| Adjacent-Band Collision Risks (Device) | N/A – guard band exists to prevent adjacent band interference |
| Example Devices Or Skus | N/A – guard band (no commercial devices) |
| Antenna Form Factor (Typical) | N/A – guard band; minimal equipment deployed |
| Power Source Or Duty Profile (Typical) | Receiver‑side only; duty driven by application (tracking vs. timing holdover). |
🛡️ Regulatory & Neighbors
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 1780 |
| Upper Band Frequency Limit | 1805 |
| Rx Blocking Min dBm | N/A – passive receiver |
| Lower Neighbor Use | Mobile uplink (1755–1780 MHz) |
| Upper Neighbor Use | Mobile downlink (Band 3) 1805–1850 MHz |
| Lower Neighbor Band | Mobile Uplink (FDD) |
| Lower Neighbor Range | 1755–1780 MHz |
| Upper Neighbor Label | Mobile Downlink (FDD – Band 3) |
| Upper Neighbor Range | 1805–1850 MHz |
| Adjacent-Band Collision Risks (Device) | N/A – guard band exists to prevent adjacent band interference |
| Real-World Range (Indoor/Outdoor) | N/A – guard band (not used for communications) |
| US FCC Alloc | Guard band / restricted use; part of Mobile allocation with strict emission limitsGuard band / restricted use; part of Mobile allocation with strict emission limits |
| CA IC Alloc | Guard band / restricted; part of Mobile allocation with coordination requirementsGuard band / restricted; part of Mobile allocation with coordination requirements |
| UK Ofcom Alloc | Guard band / restricted; transition zone between uplink and downlinkGuard band / restricted; transition zone between uplink and downlink |
| Regulatory References | US: 47 CFR Part 27 (guard band provisions); ITU-R SM.1541 (unwanted emissions); CA: ISED Canada guard band policies; ITU-R SM.1541; UK: Ofcom guard band guidance; ITU-R SM.1541; ETSI EN 301 908 |
| Global Harmonization | Varies by region – guard band placement depends on local FDD band plans |
| Crossborder Coordination | Minimal – guard band coordination tied to adjacent licensed services |
| Sharing Mechanism | Emission limits and coordination; guard band isolation between uplink and downlink |
| Auction Status | N/A – guard band between licensed mobile services |
| Guard Or Pair | Guard band (FDD transition zone) |
📈 Market & Measurements
| Field | Value |
|---|---|
| Noise Floor | Low – guard band with minimal intentional emissions |
| Interference Cases | Protect adjacent uplink (1755-1780 MHz) and downlink (1805+ MHz); strict emission masks |
| Lower Neighbor Range | 1755–1780 MHz |
| Upper Neighbor Range | 1805–1850 MHz |
| Interference Notes | Expect uplink UE emissions; band-edge masks and coordination protect adjacent services. Local rules vary by region. |
| Market Licensing Model | Generally unlicensed/restricted; guard band between licensed mobile services |
| Market Commercial Value | Low – guard band with minimal commercial use; critical for interference protection |
| Market Common Devices | Minimal – guard band; some low-power telemetry or coordination systems where permitted |
| Market Deployment Density | N/A – guard band; minimal active use to prevent interference |
| Noise Floor (Estimated) | Low – guard band with minimal intentional emissions |
| Market Commercial Value (Estimated) | Low – guard band with minimal commercial use; critical for interference protection |
| Ecosystem Maturity | N/A – guard band (not a service band) |
| Indoor Penetration | N/A – guard band (not used for indoor propagation) |
| Known Interference | Guard band purpose: prevent interference between adjacent uplink (1755-1780) and downlink (1805+) services |
| Device Ecosystem Size | Minimal – guard band with restricted use |
| Real-World Range (Indoor/Outdoor) | N/A – guard band (not used for communications) |
| Antenna Form Factor (Typical) | N/A – guard band; minimal equipment deployed |
| Ecosystem Maturity | N/A – guard band (not a service band) |
| Device Ecosystem Size | Minimal – guard band with restricted use |
| Chipset Availability | N/A – guard band; not supported in commercial chipsets |
| Operator Deployments | N/A – guard band (not actively deployed) |
| Technology Generations Deployed | N/A – guard band |
| Roaming Support | N/A – guard band |
| Traffic Load Share | N/A – guard band (minimal traffic) |
| Indoor Penetration | N/A – guard band (not used for indoor propagation) |
| Known Interference | Guard band purpose: prevent interference between adjacent uplink (1755-1780) and downlink (1805+) services |
| Occupancy | Very low – guard band; minimal authorized use |
| Occupancy Bucket Pct | Very Low (<1%) – guard band with restricted use |
| Latency Profile | Deterministic; satellite signal propagation delay ~67 ms (20,200 km) |
| Common Channels Or Profiles | N/A – guard band (no channelization) |
| Security Features | N/A – guard band |
| Lbt Or Fhss Requirement | N/A – guard band; transmissions restricted/prohibited |
| Popularity (Installed Base) | N/A – guard band |
| Coexistence Tips | Maintain guard band integrity; avoid unauthorized transmissions |
| Latency Class | N/A – guard band (no active services) |
| Device Hotspots (Scoped && Tagged) | N/A – guard band |