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What (who) is 1 2-centimeter band - definition

AMATEUR RADIO FREQUENCY ALLOCATIONS

70 cm; 70cm; 70 centimeters; 70 centimeter band; 70 cm band; 70cm band; 70 centimeter; 440 MHz band

1-2-3

WIKIMEDIA DISAMBIGUATION PAGE

1, 2, 3; 1-2-3 (disambiguation); 1 2 3; One two three; 1. 2. 3.; 1. 2. 3...; 1. ... 2. ... 3. ...; 123 (song); 1-2-3 (song); 1-2-3 (album); 1. 2. 3; I-II-III; 1. 2. 3..; 1, 2, 3 (song); 1, 2, 3! (song); 1, 2, 3!; 1,2,3; 1 2 3 (song); 1. 2. 3. ...; 1, 2, 3 (disambiguation)

Lotus 1-2-3

1 − 2 + 3 − 4 + ⋯

INFINITE SERIES

1 - 2 + 3 - 4 + · · ·; 1 - 2 + 3 - 4 + …; 1 - 2 + 3 - 4 + ...; 1 − 2 + 3 − 4 + …; 1−2+3−4+···; 1-2+3-4+···; 1-2+3-4+…; 1-2+3-4+...; 1−2+3−4+…; 1−2+3−4+...; 1-2+3-4+; 1-2+3-4; 1−2+3−4+; 1−2+3−4; 1 − 2 + 3 − 4 +; 1 − 2 + 3 − 4; 1 - 2 + 3 - 4 +; 1 - 2 + 3 - 4; 1 − 2 + 3 − 4 + . . .; 1 - 2 + 3 - 4 + . . .; 1 − 2 3 − 4 · · ·; 1 - 2 + 3 - 4 ...; 1 − 2 + 3 − 4 + · ·; 1 − 2 + 3 − 4 + ·; 1- 2 + 3 - 4; 1 − 2 + 3 − 4 + ...; 1 − 2 + 3 − 4 + ···; 1 − 2 + 3 − 4 + · · ·

In mathematics, 1 − 2 + 3 − 4 + ··· is an infinite series whose terms are the successive positive integers, given alternating signs. Using sigma summation notation the sum of the first m terms of the series can be expressed as

https://en.wikipedia.org/wiki/1_−_2_+_3_−_4_+_⋯

1 − 2 + 4 − 8 + ⋯

INFINITE SERIES

1 − 2 + 4 − 8 + 16 − · · ·; 1 + 2 + 4 + 8 +...; 1 + 2 + 4 + 8 +..; 1 + 2 + 4 + 8 +.; 1+2+4+8.; 1+2+4+8..; 1+2+4+8+..; 1+2+4+8+.; 1 − 2 + 4 − 8 + · · ·; 1 − 2 + 4 − 8 + …; 1 − 2 + 4 − 8 + ...

In mathematics, is the infinite series whose terms are the successive powers of two with alternating signs. As a geometric series, it is characterized by its first term, 1, and its common ratio, −2.

https://en.wikipedia.org/wiki/1_−_2_+_4_−_8_+_⋯

Wikipedia

70-centimeter band

The 70-centimeter or 440 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio and amateur satellite use. The ITU amateur radio allocation is from 430 to 440 MHz; however, some countries, such as the United States, allocate hams 420 to 450 MHz. Depending on the country the band is shared with other radio services (in United States with government radar systems such as PAVE PAWS).

70 centimeters is a popular ham band due to the ready availability of equipment in both new and used markets. Most amateurs operating on 70 cm use either equipment purpose-built for ham radio, or commercial equipment designed for nearby land mobile frequencies. Amateurs predominately use the band for FM or digital voice communications through repeaters (useful for emergency communications), as well narrow band modes (analog and digital) for long-distance communications (called "DX", including Moonbounce). The band is also popular for Amateur Satellite Service. Due to its size, it's the lowest frequency ham band which can support amateur television transmissions.

https://en.wikipedia.org/wiki/70-centimeter band