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Maidenhead locators are also commonly referred to as QTH locators, grid locators or grid squares, although the "squares" are distorted on any non-equirectangular cartographic projection. Use of the terms QTH locator and QRA locator was initially discouraged, as it caused confusion with the older QRA locator system.
The user can input a central location in one of several forms - latitude/longitude, Maidenhead ("Grid") Locator, or an address or place-name - and can then choose one of three range-types within which the summits should be found: closed circle: summits within the entire circle will be found;
The standard message is <callsign> + <4 character locator> + <dBm transmit power>; for example “K1ABC FN20 37” is a signal from station K1ABC in Maidenhead grid cell “FN20”, sending 37 dBm, or about 5.0 W (legal limit for 630 m). Messages with a compound callsign and/or 6 digit locator use a two-transmission sequence.
The QRA locator, also called QTH locator in some publications, is an obsolete geographic coordinate system used by amateur radio operators in Europe before the introduction of the Maidenhead Locator System. As a radio transmitter or receiver location system the QRA locator is considered defunct, but may be found in many older documents.
English: The Maidenhead Locator System grid over Europe. The areas marked with big letters are "fields" and the small numbers denote "squares". ... Radiotaajuuskirja ...
Repeaters are listed in the directory along with its call sign, Maidenhead Locator System and GPS coordinates, transmit/receive offset ("split"), CTCSS and DCS squelch settings, and VoIP settings (IRLP and Echolink nodes). The directory has over 50,000 repeater listings in over 170 countries. [1]
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Grid reference system – Cartesian geographic coordinate system; Maidenhead Locator System – Geocode system used by radio amateurs; Open Location Code – Short text encoding of geographic coordinates; Universal Transverse Mercator coordinate system – Map projection system