Known as Ham-Friendly ALE, the amateur radio ALE standard is used to establish radio communications, through a combination of active ALE on internationally recognized automatic data frequencies, and passive ALE scanning on voice channels. It is programmed with a unique ALE address, similar to a phone number (or on newer generations, a username). ALE is a feature in an HF communications radio transceiver system that enables the radio station to make contact, or initiate a circuit, between itself and another HF radio station or network of stations. Over time, demand for ALE capabilities spread and by the late 1990s, most new government HF radios purchased were designed to meet at least the minimum ALE interoperability standard, making them eligible for use with standard ALE node gear. A binary outcome of "Good enough" or not gave no way of automatically choosing between two channels, both of which are currently good enough for minimum communications. This is significantly more reliable than cellphone infrastructure during disasters or wars yet is mostly immune to such considerations itself. In August 2005, ham radio operators supporting communications for emergency Red Cross shelters used ALE for Disaster Relief operations during the Hurricane Katrina disaster. The modulation method is 8ary Frequency Shift Keying or 8FSK, also sometimes called Multi Frequency Shift Keying MFSK, with eight orthogonal tones between 750 and 2500 Hz. Radios implementing at least minimum ALE node functionality as an option internal to the radio became more common and significantly more affordable. As in all interoperability scenarios, care should be taken to determine if this is acceptable before using such extensions.
ALE is most commonly used for hooking up operators for voice contacts on SSB (single-sideband modulation), HF internet connectivity for email, SMS phone texting or text messaging, real-time chat via HF text, Geo Position Reporting, and file transfer. Interoperability is a critical issue for the disparate entities which use radiocommunications to fulfill the needs of organizations. After confirming the channel is indeed idle, it then sends a brief selective calling signal identifying the intended recipient. For many militaries, whose needs for maximized intra-organizational capability and capacity always strain existing systems, the additional cost and complexity of 3G is far more compelling. When the distant scanning station detects ALE activity, it stops scanning and stays on that channel until it can confirm whether or not the call is for it.
The orderwire message, known as AMD (Automatic Message Display), is the most commonly used text transfer method of ALE, and the only universal method that all ALE controllers have in common for displaying text. Organizations known to use ALE for Emergency management, disaster relief, ordinary communication or extraordinary situation response include: Red Cross, FEMA, Disaster Medical Assistance Teams, NATO, Federal Bureau of Investigation, United Nations, AT&T, Civil Air Patrol, SHARES, State of California Emergency Management Agency (CalEMA), other US States' Offices of Emergency Services or Emergency Management Agencies, and Amateur Radio Emergency Service (ARES). Top ALE abbreviation meanings updated September 2020 If the callee fails to respond or the handshaking fails, the originating ALE node usually selects another frequency either at random or by making a guess of varying sophistication. High Frequency Internet Protocol or HFIP may be used with ALE for internet access via HF.
It also indicates the callsign or other identifying information of the linked station, similar to Caller ID. A standalone ALE radio combines an HF SSB radio transceiver with an internal microprocessor and MFSK modem. The IARU Global Amateur Radio Emergency Communications Conferences (GAREC) and IARU Global Simulated Emergency Tests have included ALE. The ALE built-in text messaging facility can be used to transfer short text messages as an "orderwire" to allow operators to coordinate external equipment such as phone patches or non-embedded digital links, or for short tactical messages.. In this technique, active ALE frequencies include pseudorandom periodic polite station identification, while passive ALE frequencies are silently scanned for selective calling.
On many ALE radios this is similar to dialing a phone number. Amateur radio adapted 2G ALE techniques, by using the common denominators of the 2G ALE protocol, with a limited subset of features found in the majority of all ALE radios and controllers.  All U.S. armed forces operate multiple similar networks. "global warming" The received signal is usually decoded using digital signal processing techniques that are capable of recovering the 8FSK signal at a negative decibel signal-to-noise ratio (i.e., the signal may be recovered even when it is below the noise level). Some channels may not be available in every country. ALE Stands For:
Thus it requires sufficient duration of transmission time for calls to connect or link with another station that is unsynchronised with its calling signal. In 2001, the first organized and coordinated global ALE nets for International Amateur Radio began. All Amateur Radio ALE channels use "USB" Upper Sideband standard.
ALE serves as a convenient method of beyond line of sight communication.
The 3G ALE modem signal also provides better robustness and can work in channel conditions that are less favorable than 2G ALE. Please look for them carefully. The two stations' ALE controllers automatically handshake to confirm that a link of sufficient quality has been established, then notify the operators that the link is up. The result is increased resilience, decreased fragility, increased ability to communicate information effectively, and the ability to rapidly add to or replace communication points as the situation demands. For more advanced functions and programming of ALE controllers and networks, it became similar to the use of menu-enabled consumer equipment or the optional features typically encountered in software. In this respect, the longstanding need in HF radio for repetitive calling on pre-determined time schedules or tedious monitoring static is eliminated. Amateur radio operators commonly provide local, regional, national, and international emergency / disaster relief communications. Civilian and non-government adoption rates are much lower than 2G ALE due to the extreme cost as compared to surplus or entry-level 2G gear as well as the significantly increased system and planning complexity necessary to realize the benefits inherent in the 3G specification.
An ALE radio system enables connection for voice conversation, alerting, data exchange, texting, instant messaging, email, file transfer, image, geo-position tracking, or telemetry.  When a call is initiated, the LQA lookup table is searched for matches involving the target ALE address and the best historic channel is used to call the target station. Hot standby ALE nets are in constant operation 24/7/365 for International Emergency and Disaster Relief communications.  It is common for vendors to offer extensions to AMD for various non-standard features, although dependency on these extensions undermines interoperability. Alternatively, digital data can be exchanged via a built-in or external modem (such as a STANAG 5066 or MIL-STD-188-110B serial tone modem) depending on needs and availability.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only.  The lowest common denominator technique enables any manufacturer's ALE radios or software to be used for HF interoperability communications and networking.  The increasing need for instant connectivity for logistical and tactical disaster relief response communications, such as the 2004 Indian Ocean earthquake tsunami led to ITU actions of encouragement to countries around the world toward loosening restrictions on such communications and equipment border transit during catastrophic disasters.
All stations in the same group scan and receive each channel at precisely the same time window. The over-the-air layers of the protocol involve the use of forward error correction, redundancy, and handshaking transponding similar to those used in ARQ techniques.. Acronym Finder, All Rights Reserved. List of 275 ALE definitions. https://acronyms.thefreedictionary.com/ALE, Fifteen there were in all, making themselves merry with feasting and drinking as they sat around a huge pasty, to which each man helped himself, thrusting his hands into the pie, and washing down that which they ate with great horns of, He came to me, look you, saying that if I would furnish him with a gallon of, The doctor, who was universally considered one of the best-tempered creatures on earth, made this demand in such a dreadful tone of anger, that Giles and Brittles, who were considerably muddled by, The Squire ate his bread and meat hastily, took a deep draught of, And the horses shook themselves, and the dogs jumped up and barked; the pigeons took their heads from under their wings, and looked about and flew into the fields; the flies on the walls buzzed again; the fire in the kitchen blazed up; round went the jack, and round went the spit, with the goose for the king's dinner upon it; the butler finished his draught of, If you should go near Barnard Castle, there is good, At length the dish was lifted on the table, and mugs of, "I wish, mine host," quoth he gravely to Robin, who had soberly drunk but one cup of, 'I thought,' continued he, 'I'd just look in upon you as I passed, and taste your home-brewed, Let them have change of vestments if they require it, and fire, and water to wash, and wine and, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, ALE, ECCM, and Data Communications Protocol. , The International Telecommunications Union (ITU), in response to the need for interoperation in international disaster response spurred largely by humanitarian relief, included ALE in its Telecommunications for Disaster Relief recommendations.  Each tone is 8 ms long, resulting in a transmitted over-the-air symbol rate of 125 baud or 125 symbols per second, with a raw data rate of 375 bits per second. Automatic Link Establishment, commonly known as ALE, is the worldwide de facto standard for digitally initiating and sustaining HF radio communications.
In modern HF communications, ALE has largely replaced HF prediction charts, propagation beacons, chirp sounders, propagation prediction software, and traditional radio operator educated guesswork. This dramatically reduces staffing and equipment considerations, while enabling small mobile or portable stations to participate in multiple networks and subnetworks. Largely due to the ubiquity of 2G ALE, it became the primary method for providing interoperability on HF between governmental and non-governmental disaster relief and emergency communications entities, and amateur radio volunteers. For the average user of ALE, after learning how to work the basic functions of the HF transceiver, it became similar to operating a cellular mobile phone. What does ALE mean? This information is coupled with the ALE address of the sending node and the channel the message was received on, and stored in the node's Link Quality Analysis (LQA) memory.
This listing is current as of February 2020.
Once the target station has heard the call and responded, a bell or other signalling device will notify both operators that a link has been established. ALE enables rapid unscheduled communication and message passing without requiring complex message centers, multiple radios and antennas, or highly trained operators.
Various methods and proprietary digital signaling protocols were used by different manufacturers in first generation ALE, leading to incompatibility. The operator then un-mutes the radio and answers the call then can talk in a regular conversation or negotiates a data link using voice or the ALE built-in short text message format. PSP, HIPAA
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