Itu frequency designation
The itu radio bands are designations defined in the itu radio regulations article 2, provision no 21 states that the radio spectrum shall be subdivided into nine frequency bands, which shall be designated by progressive whole numbers in accordance with the following table  . The international telecommunication union (itu) has created an internationally agreed upon system to describe or classify radio frequency signal emissions these emissions are classified by signal bandwidth, modulation method, nature of the modulating signal and the type of information transmitted on the carrier signal. Radio frequency band designations designation frequency wavelength hf 3 - 30 mhz 100 m - 10 m vhf 30 - 300 mhz 10 m - 1 m itu band designation frequency wavelength 1 elf 3 - 30 hz 100,000 km - 10,000 km 2 slf 30 -300 hz 10000 km - 1000 km 3 ulf 300 - 3000 hz 1000 km - 100 km. Radio frequencies must be shared with terrestrial radio services, and international frequency assignment is essential to avoid interference between all the different uses made of the radio spectrum the international telecommunications union (itu) is the global body that assigns radio frequency allocations. Radio frequency (rf) refers to an oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around twenty thousand times per second (20 khz) to around three hundred billion times per second (300 ghz.
Extremely low frequency (elf) is the itu designation for electromagnetic radiation (radio waves) withfrequencies from 3 to 30 hz, and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively. Super high frequency is the itu designation for radio frequencies in the range between 3 ghz and 30 ghz this band of frequencies is also known as the centimetre band or centimetre wave as the. The following table is adapted from the international telecommunications union radio regulations appendix s18, including changes adopted by the 1997 world radio conferencetransmission on frequencies or channels shown in blue are not allowed within us territorial waters, but are allowed on the high seas and in most other countries.
23 frequency bands allocated by the international telecommunication union (itu) frequency ranges have been allocated by the itu for use in deep space and near-earth research these ranges are listed in table 2 table 2 allocated frequency bands band designation deep space bands (for spacecraft greater than 2 million km from earth) near earth. These itu radio bands are defined in the itu radio regulations article 2, provision no 21 states that the radio spectrum shall be subdivided into nine frequency bands, which shall be designated by progressive whole numbers in accordance with the following table  . With the variety of satellite frequency bands that can be used, designations have been developed so that they can be referred to easily the higher frequency bands typically give access to wider bandwidths, but are also more susceptible to signal degradation due to ‘rain fade’ (the absorption of radio signals by atmospheric rain, snow or ice. An emission designator is a code associated with a frequency that gives information about the frequency's bandwidth and the nature of the signal on the frequency for scanner users, it can be useful for determining whether a frequency is analog or digital, and even whether the frequency transmits voice and/or data. The itu makes arrangements concerning the division of the frequency spectrum in frequency bands and the designations that are given to the frequency bands after a frequency band has received a certain designation, the countries connected to the itu will make technical arrangements about the manner in which available frequency bands may be used.
The current (2002) revision keeps the same letter band designations, includes a change in the definition of millimeter wave frequencies to conform to the itu designation, and revises the notes to table 1. Ship radio licence and ship portable radio licence terms and conditions allocated in accordance with the relevant international telecommunication union (itu) radio regulations2, itu frequency or band designation t u v frequency/band 4575254 mhz 467525 5 mhz 457550 5 mhz 467550 5. If anyone has any other information on the frequency letter bands (such as a reference for these definitions), send it in for those that want to go beyond the letter band frequency ranges, take a look at the official fcc interactive spectrum allocation chart.
Itu frequency designation
Frequency allocations may display amendments that have been adopted by the fcc but that have not yet taken effect 1 the international table (columns 1-3 of § 2106) reflects article 5, section iv of the itu radio regulations, edition of 2012, except for (a) errors that the itu has subsequently corrected and (b) the revisions listed below. The vhf frequencies shown below, have been set aside by the itu for the purposes stated as of january 01, 2017, there are now 98 vhf channels made available by international agreement. Itu frequency designation the itu radio bands are designations defined in the itu radio regulations provision no 21 states that the radio spectrum shall be subdivided into nine frequency bands, which shall be designated by progressive whole numbers” in accordance with the following table.
- Microwave frequency bands the microwave spectrum is usually defined as a range of frequencies ranging from 1 ghz to over 100 ghz this range has been divided into a number of frequency bands, each represented by a letter.
- Radio frequency bands 1 international telecommunication union the itu actually assigns the designation elf to everything below vlf thus elf on the table above is elf1, slf is elf2, and ulf is elf3.
Fiberdyne labs, inc dense wavelength division multiplexing (dwdm) itu grid: c-band, 100 ghz spacing note: for 200ghz spacing use either odd or even numbered channels. Frequency band designations military radar bands military radar band nomenclature, l, s, c, x, ku, and k bands originated during world war ii as a secret code so scientists and engineers could talk about frequencies without divulging them. This refers to an internationally standardized assignment of frequency pairings for common use this refers to a vessel's selcall number this refers to vhf channels 1-28 and 60-88 7-81j5: which is a valid itu designation ch-1604 ch-706 approved for gmdss stations type approved under fcc part 80 rules and regulations. Radio frequencies are often grouped in ranges called bands radio frequencies are often grouped in ranges called bands.