SpectrumWiki

Radio spectrum allocations

Look up a frequency or a range.

Examples: 88.5 MHz, 1350–1430 MHz, 2.4 GHz

3.1 GHz (3,100,000,000 Hz)

U.S. Non-Federal-Government Allocations

3100 – 3300 MHz

Earth exploration-satellite (active)

Space research (active)

Radiolocation

US342

FCC rule parts

Private Land Mobile (90)

U.S. Federal Government Allocations

3100 – 3300 MHz

RADIOLOCATION G59

Earth exploration-satellite (active)

Space research (active)

US342

ITU Region 1 Allocations

3100 – 3300 MHz

RADIOLOCATION

Earth exploration-satellite (active)

Space research (active)

5.149 5.428

ITU Region 2 Allocations

3100 – 3300 MHz

RADIOLOCATION

Earth exploration-satellite (active)

Space research (active)

5.149 5.428

ITU Region 3 Allocations

3100 – 3300 MHz

RADIOLOCATION

Earth exploration-satellite (active)

Space research (active)

5.149 5.428

Footnotes

5.149 In making assignments to stations of other services to which the bands:
13 360-13 410 kHz,
25 550-25 670 kHz,
37.5-38.25 MHz,
73-74.6 MHz in Regions 1 and 3,
150.05-153 MHz in Region 1,
322-328.6 MHz,
406.1-410 MHz,
608-614 MHz in Regions 1 and 3,
1 330-1 400 MHz,
1 610.6-1 613.8 MHz,
1 660-1 670 MHz,
1 718.8-1 722.2 MHz,
2 655-2 690 MHz,
3 260-3 267 MHz,
3 332-3 339 MHz,
3 345.8-3 352.5 MHz,
4 825-4 835 MHz, 4 950-4 990 MHz,
4 990-5 000 MHz,
6 650-6 675.2 MHz,
10.6-10.68 GHz,
14.47-14.5 GHz,
22.01-22.21 GHz,
22.21-22.5 GHz,
22.81-22.86 GHz,
23.07-23.12 GHz,
31.2-31.3 GHz,
31.5-31.8 GHz in Regions 1 and 3,
36.43-36.5 GHz,
42.5-43.5 GHz,
48.94-49.04 GHz,
76-86 GHz,
92-94 GHz,
94.1-100 GHz, 102-109.5 GHz,
111.8-114.25 GHz,
128.33-128.59 GHz,
129.23-129.49 GHz,
130-134 GHz,
136-148.5 GHz,
151.5-158.5 GHz,
168.59-168.93 GHz,
171.11-171.45 GHz,
172.31-172.65 GHz,
173.52-173.85 GHz,
195.75-196.15 GHz,
209-226 GHz,
241-250 GHz,
252-275 GHz
are allocated, administrations are urged to take all practicable steps to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see Nos. 4.5 and 4.6 and Article 29). (WRC 07)
5.428 Additional allocation: in Kyrgyzstan and Turkmenistan, the frequency band 3 100-3 300 MHz is also allocated to the radionavigation service on a primary basis. (WRC 19)
G59 In the bands 902-928 MHz, 3100-3300 MHz, 3500-3650 MHz, 5250-5350 MHz, 8500-9000 MHz, 9200-9300 MHz, 13.4-14.0 GHz, 15.7-17.7 GHz and 24.05-24.25 GHz, all Federal non-military radiolocation shall be secondary to military radiolocation, except in the sub-band 15.7-16.2 GHz airport surface detection equipment (ASDE) is permitted on a co-equal basis subject to coordination with the military departments.

US342 In making assignments to stations of other services to which the bands:

13 360-13 410 kHz	42.77-42.87 GHz*
25 550-25 670 kHz	43.07-43.17 GHz*
37.5-38.25 MHz	43.37-43.47 GHz*
322-328.6 MHz*	48.94-49.04 GHz*
1330-1400 MHz*	76-86 GHz
1610.6-1613.8 MHz*	92-94 GHz
1660-1660.5 MHz*	94.1-100 GHz
1668.4-1670 MHz*	102-109.5 GHz
3260-3267 MHz*	111.8-114.25 GHz
3332-3339 MHz*	128.33-128.59 GHz*
3345.8-3352.5 MHz*	129.23-129.49 GHz*
4825-4835 MHz*	130-134 GHz
4950-4990 MHz	136-148.5 GHz
6650-6675.2 MHz*	151.5-158.5 GHz
14.47-14.5 GHz*	168.59-168.93 GHz*
22.01-22.21 GHz*	171.11-171.45 GHz*
22.21-22.5 GHz	172.31-172.65 GHz*
22.81-22.86 GHz*	173.52-173.85 GHz*
23.07-23.12 GHz*	195.75-196.15 GHz*
31.2-31.3 GHz	209-226 GHz
36.43-36.5 GHz*	241-250 GHz
42.5-43.5 GHz	252-275 GHz

are allocated (*indicates radio astronomy use for spectral line observations), all practicable steps shall be taken to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see ITU Radio Regulations at Nos. 4.5 and 4.6 and Article 29).

Wiki entries

Golden Dome

Proposed Use 3100–3450 MHz Golden Dome

Golden Dome is a planned capability to protect the United States from missile attack, similar to, but much broader than, Israel's Iron Dome.

Golden Dome is one of the highest priorities of the Trump administration as of 2025.

Although the details of what Golden Dome is and what exactly it will do are not yet established, based on Congressional testimony, it appears that DoD radars and other systems that operate in the 3.1-3.45 GHz band will be critical components of Golden Dome.

SPY-1 Shipborne Air Surveillance Radar

Current Use 3100–3500 MHz SPY-1 Shipborne Air Surveillance Radar

The SPY-1 is a U.S. Navy phased array surveillance radar that is a component of the Aegis combat system. It is installed on guided missile cruisers (CG) and guided missile destroyers (DDG). Several variants of the SPY-1, including the -1A, -1B(V), -1D, and -1F are in service, modified to fit specific types of vessels. The -1F is not installed on any U.S. ships.

U.S. land-based test and training sites for the SPY-1 are at Moorestown, NJ, and Wallops Island, VA.

The SPY-1 possesses the following technical characteristics according to ITU-R Recommendation M.1465:

-Modulation: Q7N (angle-modulated, two or more digital channels, no information transmitted)

-Tuning range: 3100-3500 MHz

-Peak tx power into antenna: 4 – 6.4 MW (66 – 68 dBW)

-Antenna gain: 42 dBi

-Peak EIRP: 63 – 101 GW (108-110 dBW)

-Pulse width: 6.4 – 51.2 microseconds

-Pulse repetition rate: 0.152-6 kHz

-Duty cycle: 0.8-2.0%

-Tx bandwidth (-3 dB): 4 MHz

-Average EIRP (=peak EIRP x duty cycle): 504 MW – 2 GW (87-93 dBW)

-Minimum effective isotropic power spectral density: 126 W/Hz (51 dBm/Hz)

-Maximum effective power isotropic spectral density: 500 W/Hz (57 dBm/Hz)

-Antenna type: Phased array

-Beamwidth: 1.7 deg (azimuth and elevation)

-Polarization: Vertical

-Antenna rotation rate: N/A (electronically steered)

The SPY-1 is known to emit very high levels of out-of-band emissions outside of the 3100-3500 MHz band.

Through-wall Radar waiver

Current Use 3100–3500 MHz L-3 CyTerra through-wall radar

Under a waiver granted to L-3 CyTerra, a division of L-3
Communications Corporation, the company can certify and market frequency-stepping radars in the 3100-3500 MHz band. Units must be licensed under Part 90 of the FCC rules. Terms of the waiver limit eligibility to state and local police and firefighters, and limit use to actual emergencies involving threats to safety of life, and necessary training. Another company has received an identical "me too" waiver.

Wireless Cameras for Content Capture

Current Use 3100–3450 MHz Content Capture for Sporting and Other Major Events

The 3100-3450 MHz band is heavily used in the U.S. to support wireless cameras and other equipment for temporary use during major news and sporting events. These operations are typically under a short-term experimental license (called a Special Temporary Authority, or STA), which may cover multiple venues over multiple dates. Virtually all major sporting events will use this band for some aspect of their operations. The use of this band is coordinated in advance among the band's incumbents (the Federal government), and all systems at the event that wish to share this band.

Prior to the adoption of the 3.45 GHz Service for IMT in the 3450-3550 MHz band, content capture used 3100-3500 MHz, but now those operations do not use the upper 50 MHz to avoid interference to or from 5G systems.

Frequencies in the 2 GHz range are used for similar purposes, also under STA and prior coordination.

1435-1525 MHz is used for similar purposes, plus wireless microphones.