Editing Radiosonde (section)

==International regulation==

According to the [[International Telecommunication Union]], a '''meteorological aids service''' (also: ''meteorological aids radiocommunication service'') is – according to ''Article 1.50'' of the [[ITU Radio Regulations]] (RR)<ref>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.50, definition: ''meteorological aids service / meteorological aids radiocommunication service''</ref> – defined as ''"A [[radiocommunication service]] used for meteorological, including hydrological, observations and exploration.''
Furthermore, according to ''article 1.109'' of the ITU RR:<ref>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.109, definition: ''radiosonde''</ref> 
{{blockquote|A radiosonde is an automatic [[radio transmitter]] in the [[meteorological aids service]] usually carried on an [[aircraft]], [[weather balloon|free balloon]], kite or parachute, and which transmits meteorological data. Each ''radio transmitter'' shall be classified by the ''radiocommunication service '' in which it operates permanently or temporarily.}}

===Frequency allocation===
The allocation of radio frequencies is provided according to ''Article 5'' of the ITU Radio Regulations (edition 2012).<ref>''ITU Radio Regulations, CHAPTER II – Frequencies, ARTICLE 5 Frequency allocations, Section IV – Table of Frequency Allocations''</ref>

In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is with-in the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.
*primary allocation:  is indicated by writing in capital letters (see example below)
*secondary allocation: is indicated by small letters
*exclusive or shared utilization: is within the responsibility of administrations 
However, military usage, in bands where there is civil usage, will be in accordance with the ITU Radio Regulations.

; Example of [[frequency allocation]]:
{| class=wikitable
|- bgcolor="#CCCCCC" align="center"
|align="center" colspan="3"| '''Allocation to services'''
|- align="center"
| [[International Telecommunication Union region|Region 1]] || Region 2 || Region 3
|-
|colspan="3"|401-402 MHz &nbsp;&nbsp; &nbsp;&nbsp; '''METEOROLOGICAL AIDS'''<br />
::::: SPACE OPERATION (space-to-Earth) <br />EARTH EXPLORATION-SATELLITE (Earth-to-space) <br />METEOROLOGICAL-SATELLITE (Earth-to-space)<br />Fixed <br />Mobile except aeronautical mobile
|-
|}