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The current world distance record on the 1 mm band was 114 kilometres (71 mi) set by US stations WA1ZMS and W4WWQ on January 21, 2008. [4] [5]The longest distance achieved on 1 mm in the United Kingdom was 9.33 kilometres (5.80 mi) between stations G0FDZ and G8CUB on April 30 2019.
Extremely high frequency (EHF) is the International Telecommunication Union designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). [1] [2] It is in the microwave part of the radio spectrum, between the super high frequency band and the terahertz band.
As frequency increases above 30 GHz (the beginning of the millimeter wave band), atmospheric gases absorb increasing amounts of power, so the power in a beam of radio waves decreases exponentially with distance from the transmitting antenna. At 30 GHz, useful communication is limited to about 1 km, but as frequency increases the range at which ...
Band 3: 1 Mm: 300 Hz: 1.24 peV 2 Band 2: 10 Mm 30 Hz 124 feV: 1 Band 1: ... making this frequency range useless for long-distance communication. Infrared radiation
On March 4, 2003, US stations WA1ZMS and W4WWQ set a new distance record of 1.4 kilometres (0.87 mi) on 322 GHz, using wide-band frequency modulation. [ 4 ] [ 6 ] [ 5 ] WA1ZMS and W4WWQ later set another record of 1.42 kilometres (0.88 mi) on 403 GHz using CW ( Morse code ) on December 21, 2004.
Assuming a perfect sphere with no terrain irregularity, the distance to the horizon from a high altitude transmitter (i.e., line of sight) can readily be calculated. Let R be the radius of the Earth and h be the altitude of a telecommunication station. The line of sight distance d of this station is given by the Pythagorean theorem;
Terahertz waves lie mostly at the far end of the infrared band, the longest ones in the microwave band. Terahertz radiation – also known as submillimeter radiation, terahertz waves, tremendously high frequency [1] (THF), T-rays, T-waves, T-light, T-lux or THz – consists of electromagnetic waves within the International Telecommunication Union-designated band of frequencies from 0.1 to 10 ...
The first 2 mm distance record, and still standing longest distance achieved on the band, was set by US stations WA1ZMS and W4WWQ, who established contact at 114.4 kilometres (71.1 mi) on February 26, 2006.