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Amateur Radio Emergency Service |
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Automatic Link Establishment "ALE"
| . . . Definition Automatic Link Establishment, ALE, is a technique for maximizing the effectiveness of communications between to equipped High Frequency radio stations by testing and determining the frequency at which propagation is most effective between the two stations. Automatic link establishment is a robust, adaptive HF radio method for automatically establishing communications, networking, linking protection, high-speed data modems, and basic HF radio parameters over HF single sideband (SSB) links. Using ALE, an operator or computer-initiated control signal can automatically initiate point-to-point or point-to-multipoint calls. The ALE controller can be programmed to scan one or more frequencies, pick the best frequency for operation, and switch to voice or data operation immediately upon link establishment (High Frequency Radio Automatic Link Establishment, ALE, Application Handbook, National Telecommunications and Information Administration, NTIA). . . . History Determining the most favorable frequency for point-to-point communications can be accomplished by experimentation, trial and error, computer modeling, or by computer controlled rapid testing. . . . Theory Manually, two operators can determine the best frequency for poit-to-point communications by simply experimenting with different frequencies. However, this is time-consuming, and required predetermined schedules. ALE uses the speed and determination of the computer to test various frequencies rapidly among a net of participating stations, rapidly and accurately determining the ideal frequency for bast propagation. . . . Hardware Proprietary hardware is required to interface the computer an HF radio. . . . Software Proprietary software is required to interface the computer an HF radio. . . . Users' Group < http://www.tactical-link.com/ale_area.htm > |
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Some Materials are Patent Pending |
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