📡
Frequency
1669 MHz
Frequency
1669 MHz
🧭
Range
1669–1674 MHz
Range
1669–1674 MHz
🧩
Band Group
L-Band RAS / Meteorological Aids Edge
Band Group
L-Band RAS / Meteorological Aids Edge
🌐 Summary
The 1669 MHz allocation is part of the L-Band RAS / Meteorological Aids Edge 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: 1669 MHz is part of a region‑specific L‑band downlink segment that commonly supports meteorological‑satellite and related services. Operations must coordinate with national allocations and protect adjacent Radio Astronomy and satellite services..
N/A (passive / meteorological aids edge; not a consumer service)
🔍 Explore the full RF Spectrum database
📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 0.17962400119832 |
| Waveforms | BPSK(1), BOC(1,1), MBOC – per system specs |
| Antenna Form Factor (Typical) | Passive or active patch (25–35 mm), helical, or chip antenna tuned for ~1575 MHz. |
| Band Family | L‑Band MSS Downlink (1626.5–1660.5 MHz) |
| Band | L‑Band |
| Primary Common Name | Radio Astronomy + Radiosonde (MetAids) (shared) |
| FSPL @ 1 km [dB] | 96.3 |
| FSPL @ 10 km [dB] | 116.3 |
| Fresnel Radius @ 1 km (m) | 0.212 |
| Band Group | L-Band RAS / Meteorological Aids Edge |
| Tax Band Family | L‑Band |
| Tax Band Class | 1669 MHz – 1674 MHz L-Band Meteorological-Satellite Service |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | Shared edge: Radio Astronomy (RAS) protection / Meteorological aids (radiosonde) |
| Lower Neighbor Use | RAS below 1668.4 MHz and MSS DL below 1660.5 MHz |
| Upper Neighbor Use | Allocations above 1675 MHz (regional) |
| Typical Services Devices | Radio astronomy observatories (receive-only); meteorological radiosonde receiving systems |
| Market Common Devices | Satellite phones, gateways, IoT receivers |
| Refarming Use | Not applicable |
| Device Ecosystem Size | Niche (scientific observatories and meteorological services) |
| Device Hotspots (MHz) | N/A (passive / meteorological aids edge; not a consumer service) |
| Device Category | Consumer, automotive, aviation, maritime, IoT, military receivers |
| Typical Use Cases | Passive scientific observation (RAS) and meteorological radiosonde/aids reception near the band edge |
| Modulation (Device) | N/A (passive / meteorological aids edge; not a consumer service) |
| Channel Width (Device) [kHz] | ~2000–4000 kHz main‑lobe equivalent (receiver bandwidths vary 2–24 MHz by design) |
| Device Region Profiles | N/A (passive / meteorological aids edge; not a consumer service) |
| Per-Region EIRP Or Duty (Device) | N/A – receivers only; no transmit EIRP or duty cycle. |
| Allocation Relevance (Device) | N/A (passive / meteorological aids edge; not a consumer service) |
| Adjacent-Band Collision Risks (Device) | High risk from adjacent MSS (≤1559 MHz) and out‑of‑band cellular/ISM emitters; use SAW/ceramic filters, LNA linearity, and tight front‑end selectivity. |
| Example Devices Or Skus | N/A (passive / meteorological aids edge; not a consumer service) |
| Common Protocols | Proprietary MSS air interfaces (Iridium, Globalstar) |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | High selectivity (≥60 dB rejection across 1559–1610 MHz) |
| Interference Notes | Shared edge near Radio Astronomy. Avoid any emissions; strict adjacent-band and out-of-band limits apply. |
| Compatibility Risk Notes | 0 |
| Notes | N/A (passive / meteorological aids edge; not a consumer service) |
| Propagation Notes | Free-space propagation dominated; global satellite visibility required |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 1669 |
| Upper Band Frequency Limit | 1674 |
| EIRP Indoor Limits | Not applicable – receive-only band |
| EIRP Outdoor Limits | Not applicable – receive-only band |
| PSD Limit | Not applicable – receive-only band |
| Emission Mask Class | Passive/protected edge band; strong emission constraints on 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] | N/A – receivers only; no transmit EIRP or duty cycle. |
| Power Source Or Duty Profile (Typical) | Receiver‑side only; duty driven by application (tracking vs. timing holdover). |
| Channelization Plan | None |
| Channelization | N/A (no standardized channelization; passive/MetAids edge) |
| Guard Band Requirement | N/A (passive / meteorological aids edge; not a consumer service) |
| OOB Emission Limit [dBm/MHz] | Extremely strict protection requirements to safeguard 1661–1668 MHz RAS |
| Spurious Emission Limit (dBm) | Extremely strict; any emissions can harm RAS observations |
| RX Blocking Min [dBm] | N/A – passive receiver |
| Duplexing | N/A (Satellite downlink) |
| Duplexing Information | N/A (Satellite downlink) |
| Uplink Pairing | Not applicable – unpaired downlink only (space-to-Earth) |
| Downlink Pairing | Not applicable – unpaired downlink only (space-to-Earth) |
| Paired Band Info | N/A (passive / meteorological aids edge; not a consumer service) |
| Max EIRP [dBm] | N/A – receive-only band |
| Channelization Block Size | Operator carriers (kHz–MHz) |
| 3GPP Band Number | |
| Example 3GPP Bands | Not applicable – no 3GPP/LTE/NR band association |
| LTE Uplink Bands | Not applicable – no 3GPP/LTE/NR band association |
| LTE Downlink Bands | Not applicable – no 3GPP/LTE/NR band association |
| NR Uplink Bands | Not applicable – no 3GPP/LTE/NR band association |
| NR Downlink Bands | Not applicable – no 3GPP/LTE/NR band association |
| Guard Bands | N/A (passive / meteorological aids edge; not a consumer service) |
| Protocol Or Standard | N/A (RAS is passive); MetAids radiosonde protocols are system-dependent |
🌎 Country Overrides
| Field | Value |
|---|---|
| Tax Service Category | Passive Scientific / Meteorological Aids |
| Tax License Type | Protected (RAS) / coordinated (MetAids) |
| Tax Regions | Global (ITU Regions 1–3) |
| ITU Region 1 (Europe, Africa, Middle East (west of Persian Gulf), Western Russia & Mongolia) | Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| ITU Region 2 (North America, South America, Central America, Caribbean, Greenland, Eastern Pacific Islands (Americas region)) | Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| ITU Region 3 (Asia, Australia, Pacific Islands, Oceania, Indian Subcontinent, East Asia & Southeast Asia) | Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| License Type | Licensed / coordinated — region‑specific |
| Primary Application | Shared edge: Radio Astronomy (RAS) protection / Meteorological aids (radiosonde) |
| Primary Services | Weather imagery and data; regional satellite links |
| Spurious Emission [dBm] | Extremely strict; any emissions can harm RAS observations |
| Lower Neighbor Use | RAS below 1668.4 MHz and MSS DL below 1660.5 MHz |
| Upper Neighbor Use | Allocations above 1675 MHz (regional) |
| Licensing Model | ITU‑coordinated; operator licenses |
| Typical Services Devices | Radio astronomy observatories (receive-only); meteorological radiosonde receiving systems |
| US FCC Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)– |
| CA IC Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)– |
| UK Ofcom Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)– |
| US Ref | N/A (passive / meteorological aids edge; not a consumer service) |
| Typical Bandwidths | 12.5 kHz–5 MHz (system‑dependent) |
| Market Licensing Model | Licensed spectrum – coordinated via ITU / satellite operator agreements |
| Market Common Devices | Satellite phones, gateways, IoT receivers |
| Fresnel Radius (1st, 1 km) [m] | 0.212 |
| Typical Bandwidths (Estimated) | 12.5 kHz–5 MHz (system‑dependent) |
| Auction Status | N/A |
| Refarming Use | Not applicable |
| Typical Site Spacing km | N/A – space segment with global footprint. / N/A – space segment with global footprint. |
| Device Ecosystem Size | Niche (scientific observatories and meteorological services) |
| Traffic Load Share | N/A – receive-only service |
| Device Hotspots (MHz) | N/A (passive / meteorological aids edge; not a consumer service) |
| Device Category | Consumer, automotive, aviation, maritime, IoT, military receivers |
| Typical Use Cases | Passive scientific observation (RAS) and meteorological radiosonde/aids reception near the band edge |
| Typical Center Frequencies [MHz] | N/A (mission-specific; no standardized channel plan) |
| Rule Part (Fcc Or Region) | Passive service protections; meteorological aids rules vary by jurisdiction |
| Modulation (Device) | N/A (passive / meteorological aids edge; not a consumer service) |
| Channel Width (Device) [kHz] | ~2000–4000 kHz main‑lobe equivalent (receiver bandwidths vary 2–24 MHz by design) |
| Device Region Profiles | N/A (passive / meteorological aids edge; not a consumer service) |
| Per-Region EIRP Or Duty (Device) | N/A – receivers only; no transmit EIRP or duty cycle. |
| Allocation Relevance (Device) | N/A (passive / meteorological aids edge; not a consumer service) |
| Adjacent-Band Collision Risks (Device) | High risk from adjacent MSS (≤1559 MHz) and out‑of‑band cellular/ISM emitters; use SAW/ceramic filters, LNA linearity, and tight front‑end selectivity. |
| Example Devices Or Skus | N/A (passive / meteorological aids edge; not a consumer service) |
| Antenna Form Factor (Typical) | Passive or active patch (25–35 mm), helical, or chip antenna tuned for ~1575 MHz. |
| 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 | 1669 |
| Upper Band Frequency Limit | 1674 |
| Rx Blocking Min dBm | N/A – passive receiver |
| Lower Neighbor Use | RAS below 1668.4 MHz and MSS DL below 1660.5 MHz |
| Upper Neighbor Use | Allocations above 1675 MHz (regional) |
| Lower Neighbor Band | RAS / MSS |
| Lower Neighbor Range | 1660.5–1668.4 / 1626.5–1660.5 MHz |
| Upper Neighbor Label | MetSat / regional (varies) |
| Upper Neighbor Range | 1675–1695 MHz (MetSat in many regions) |
| Adjacent-Band Collision Risks (Device) | High risk from adjacent MSS (≤1559 MHz) and out‑of‑band cellular/ISM emitters; use SAW/ceramic filters, LNA linearity, and tight front‑end selectivity. |
| Real-World Range (Indoor/Outdoor) | N/A |
| US FCC Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| CA IC Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| UK Ofcom Alloc | Radio astronomy service (passive) / Meteorological aids (radiosonde)Radio astronomy service (passive) / Meteorological aids (radiosonde) |
| Regulatory References | US: N/A (passive / meteorological aids edge; not a consumer service); CA: N/A (passive / meteorological aids edge; not a consumer service); UK: N/A (passive / meteorological aids edge; not a consumer service) |
| Global Harmonization | N/A (passive / meteorological aids edge; not a consumer service) |
| Crossborder Coordination | Coordination and protection measures for RAS (jurisdiction-specific) |
| Sharing Mechanism | Passive coexistence only; no active sharing permitted |
| Auction Status | N/A |
| Guard Or Pair | N/A (passive / meteorological aids edge; not a consumer service) |
📈 Market & Measurements
| Field | Value |
|---|---|
| Noise Floor | Satellite downlink (space-to-Earth); GEO/MEO/LEO systems |
| Interference Cases | N/A (passive / meteorological aids edge; not a consumer service) |
| Lower Neighbor Range | 1660.5–1668.4 / 1626.5–1660.5 MHz |
| Upper Neighbor Range | 1675–1695 MHz (MetSat in many regions) |
| Interference Notes | Shared edge near Radio Astronomy. Avoid any emissions; strict adjacent-band and out-of-band limits apply. |
| Market Licensing Model | Licensed spectrum – coordinated via ITU / satellite operator agreements |
| Market Commercial Value | N/A (passive / meteorological aids edge; not a consumer service) |
| Market Common Devices | Satellite phones, gateways, IoT receivers |
| Market Deployment Density | Medium – global satellite coverage |
| Noise Floor (Estimated) | Satellite downlink (space-to-Earth); GEO/MEO/LEO systems |
| Market Commercial Value (Estimated) | N/A (passive / meteorological aids edge; not a consumer service) |
| Ecosystem Maturity | Fully mature global ecosystem (>10B receivers) |
| Indoor Penetration | N/A (passive / meteorological aids edge; not a consumer service) |
| Known Interference | N/A (passive / meteorological aids edge; not a consumer service) |
| Device Ecosystem Size | Niche (scientific observatories and meteorological services) |
| Real-World Range (Indoor/Outdoor) | N/A |
| Antenna Form Factor (Typical) | Passive or active patch (25–35 mm), helical, or chip antenna tuned for ~1575 MHz. |
| Ecosystem Maturity | Fully mature global ecosystem (>10B receivers) |
| Device Ecosystem Size | Niche (scientific observatories and meteorological services) |
| Chipset Availability | N/A (passive / meteorological aids edge; not a consumer service) |
| Operator Deployments | Global constellation operators (US, EU, Russia, China, Japan, India) |
| Technology Generations Deployed | N/A (passive / meteorological aids edge; not a consumer service) |
| Roaming Support | N/A |
| Traffic Load Share | N/A – receive-only service |
| Indoor Penetration | N/A (passive / meteorological aids edge; not a consumer service) |
| Known Interference | N/A (passive / meteorological aids edge; not a consumer service) |
| Occupancy | RAS observations are experiment-dependent; MetAids usage depends on radiosonde operations |
| Occupancy Bucket Pct | N/A (passive / meteorological aids edge; not a consumer service) |
| Latency Profile | Deterministic; satellite signal propagation delay ~67 ms (20,200 km) |
| Common Channels Or Profiles | N/A |
| Security Features | N/A (passive / meteorological aids edge; not a consumer service) |
| Lbt Or Fhss Requirement | N/A (passive / meteorological aids edge; not a consumer service) |
| Popularity (Installed Base) | Extremely high – billions of active receivers worldwide. |
| Coexistence Tips | Avoid transmissions; enforce strict adjacent-band emission masks; observatory protection considerations |
| Latency Class | N/A (passive / meteorological aids edge; not a consumer service) |
| Device Hotspots (Scoped && Tagged) | N/A (passive / meteorological aids edge; not a consumer service) |
