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2 Meters is a popular amateur radio band. It is so named because the wavelength of the radio waves is very close to 2 meters in length. It ranges in frequency from 144 to 148 MHz in the United States and Australia, and from 144 to 146 MHz in most other parts of the world. The 2 Meter band is part of the VHF spectrum, and is primarily used for local communications, within a range of about 100 miles. Because it is local and reliable, and because in many parts of the world, the licensing requirements to transmit on the 2 Meter band is easy to obtain, this band is one of the most popular non-HF ham bands. This article reads like an advertisement. ...
The wavelength is the distance between repeating units of a wave pattern. ...
Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ...
Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ...
Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultrahigh frequency VHF = Very high frequency HF = High frequency...
Much of 2 meter FM operation uses a radio repeater, a radio receiver and transmitter that retransmits a signal over a longer distance. Simple radios for FM repeater operation have become plentiful and inexpensive in recent years. A fully-functional FM transceiver and antenna can be obtained for under $200 US. For other meanings, see repeater (disambiguation). ...
While 2 meters is best known as a local band, there are opportunities for long distance communications. Occasionally, bending in the atmosphere's troposphere (ducting) can allow 2 meter signals to carry hundreds of miles. In rare cases, Sporadic E propagation can bring contacts well over 1000 miles. In telecommunication, an atmospheric duct is a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (a) are guided or focused within the duct, (b) tend to follow the curvature of the Earth, and (c) experience less attenuation in the ducts...
Sporadic E propagation is a rare form of propagation where a radio wave bounces off a sporadic E cloud, notated as Es in the E layer region of the ionosphere. ...
Common uses of 2 Meters
Frequency modulation (FM) is a form of modulation which represents information as variations in the instantaneous frequency of a carrier wave. ...
A simplex communication system is one where all signals flow in one direction. ...
For other meanings, see repeater (disambiguation). ...
Packet radio is a form of digital data transmission used in amateur radio to construct wireless computer networks. ...
Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. ...
1922 Chart of the Morse Code Letters and Numerals Morse code is a method for transmitting information, using standardized sequences of short and long marks or pulses — commonly known as dots and dashes — for the letters, numerals and special characters of a message. ...
A satellite is any object that orbits another object (which is known as its primary). ...
Band plan Below is a common band plan for 2 meters.
Sample band plan | 144.000 - 144.100 MHz | CW only, as restricted by FCC Part 97 | | 144.100 - 144.275 MHz | CW and SSB | | 144.275 - 144.300 MHz | CW propagation beacons | | 144.300 - 144.500 MHz | Satellite | | 144.510 - 144.890 MHz | FM repeater inputs (600 kHz splits) - FM repeater inputs are spaced 20 kHz apart (144.510, 144.530, 144.550, etc.)
- FM repeater inputs are coupled with outputs from 145.110 to 145.490
| | 144.910 - 145.090 MHz | Packet and FM simplex - Packet channels are spaced 20 kHz apart on the odd frequencies (144.910, 144.930, 144.950, etc.)
- FM simplex channels are spaced 20 kHz apart on the even frequencies (144.920, 144.940, 144.960, etc.)
| | 145.110 - 145.490 MHz | FM repeater outputs (600 kHz splits) - FM repeater outputs are spaced 20 kHz apart (145.110, 145.130, 145.150, etc.)
- FM repeater outputs are coupled with inputs from 144.510 to 144.890
| | 145.510 - 145.790 MHz | FM simplex, digital and satellite - Channels are spaced 20 kHz apart (145.510, 145.530, 145.550, etc.)
| | 145.800 - 146.000 MHz | Satellite | | 146.010 - 146.385 MHz | FM repeater inputs (600 kHz splits) - FM repeater inputs are spaced 15 kHz apart (146.010, 146.025, 146.040, etc.)
- FM repeater inputs are coupled with outputs from 146.610 to 146.985
| | 146.400 - 146.595 MHz | FM simplex - FM simplex channels are spaced 15 kHz apart (146.400, 146.415, 146.430, etc.)
| | 146.610 - 146.985 MHz | FM repeater outputs (600 kHz splits) - FM repeater outputs are spaced 15 kHz apart (146.610, 146.625, 146.640, etc.)
- FM repeater outputs are coupled with inputs from 146.010 to 146.385
| | 147.000 - 147.390 MHz | FM repeater outputs (600 kHz splits) - FM repeater outputs are spaced 15 kHz apart (147.000, 147.015, 147.030, etc.)
- FM repeater outputs are coupled with inputs from 147.600 to 147.990
- In some areas, 147.000 MHz is coupled with 146.400 MHz as an input instead of 147.600 MHz.
| | 147.405 - 147.585 MHz | FM simplex - FM simplex channels are spaced 15 kHz apart (147.405, 147.420, 147.435, etc.)
| | 147.600 - 147.990 MHz | FM repeater inputs (600 kHz splits) - FM repeater inputs are spaced 15 kHz apart (147.600, 147.615, 147.630, etc.)
- FM repeater inputs are coupled with outputs from 147.000 to 147.390
| The FCCs official seal. ...
Signal Tower at Cobbs Hill, near New Market, Virginia, 1864. ...
Frequencies of note - CW and SSB calling frequency is 144.200 MHz.
- APRS frequency is 144.390 MHz in the United States, 145.175 MHz in Australia and 144.800 MHz in Europe.
- FM simplex calling frequency is 146.520 MHz.
- In some areas, 146.415 - 146.505 MHz are repeater outputs with inputs +1 MHz at 147.415 - 147.505 MHz, spaced 15 kHz apart.
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