Allocations

 
U.S. Non-Federal-Government Allocations
40 - 42 MHz


U.S. Federal Government Allocations
40 - 42 MHz
FIXED
MOBILE


ITU Region 1 Allocations
40.02 - 40.98 MHz
FIXED
MOBILE


ITU Region 2 Allocations
40.02 - 40.98 MHz
FIXED
MOBILE


ITU Region 3 Allocations
40.02 - 40.98 MHz
FIXED
MOBILE


SpectrumWiki


Footnotes


5.150 The following bands:

13553-13567 kHz(centre frequency 13560kHz),
26957-27283 kHz(centre frequency 27120 kHz),
40.66-40.70 MHz(centre frequency 40.68 MHz),
902-928 MHzin Region 2 (centre frequency 915 MHz),
2400-2500 MHz(centre frequency 2450 MHz),
5725-5875 MHz(centre frequency 5800 MHz), and
24-24.25 GHz(centre frequency 24.125 GHz)

are also designated for industrial, scientific and medical (ISM) applications. Radiocommunication services operating within these bands must accept harmful interference which may be caused by these applications. ISM equipment operating in these bands is subject to the provisions of No. 15.13.

US210 In the bands 40.66-40.7 MHz and 216-220 MHz, frequencies may be authorized to Federal and non-Federal stations on a secondary basis for the tracking of, and telemetering of scientific data from, ocean buoys and wildlife. Operation in these bands is subject to the technical standards specified in: (a) Section 8.2.42 of the NTIA Manual for Federal use, or (b) 47 CFR 90.248 for non-Federal use. After January 1, 2002, no new assignments shall be authorized in the band 216-217 MHz.

US220 The frequencies 36.25 and 41.71 MHz may be authorized to Federal stations and non-Federal stations in the petroleum radio service, for oil spill containment and cleanup operations. The use of these frequencies for oil spill containment or cleanup operations is limited to the inland and coastal waterway regions.


SpectrumWiki

 
Federal Government fixed/mobile
Industrial, Scientific, and Medical Devices (ISM, FCC Part 18)
Ocean Radar (WRC-2012)
Single Channel Ground and Airborne Radio System (SINCGARS)
Access Broadband over Power Line (Access BPL)
2023 World Radiocommunication Conference (WRC-23) Preliminary Agenda Item 2.2
Experimental Ultra-Wideband (UWB) Systems
Sputnik I (aka Alpha-2)
Apex Broadcasting Band


Related Documents, Links, and Multimedia:
FCC Proceeding (1)
Occupancy Measurements (10)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 40 MHz 41 MHz 42 MHz
Wavelength 7.5 m 7.3 m 7.1 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 4.5 m2 4.3 m2 4.1 m2
Free space loss (1 m) 4.5 dB 4.7 dB 4.7 dB
Free space loss (1 km) 64.5 dB 64.7 dB 64.7 dB
Free space loss (10 km) 84.5 dB 84.7 dB 84.7 dB
Free space loss (100 km) 104.5 dB 104.7 dB 104.7 dB
Free space loss (1000 km) 124.5 dB 124.7 dB 124.7 dB
Free space loss
(35,786 km = GEO orbit)
155.6 dB 155.8 dB 155.8 dB
Free space loss (378,370 km = Moon) 176.1 dB 176.3 dB 176.3 dB