A - ALE basic description
A - ALE principle
A - ALE principles
B- ALE controler
Welcome to ALE141 MIL-STD-188-141B
Automatic Link Establishment (ALE)
The basis for ALE frequency selection is the Link Quality Analysis (LQA) that is continuously performed on the channels within the ALE scan list. The LQA is determined by analyzing the? HF Products Collins HF Features signal characteristics (signal-to-noise ratio and delay distortion) of the data signal used in sounding or initiating an ALE call. A database of the LQA values is generated, which ranks the quality of the ALE frequencies associated with each of the addressee’s mission directories. The entries in the LQA database are continually updated, with automatic downgrading of old entries.
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The latest news items
The HAP chart is a guide to frequency selection for HF communications between mobiles and a specified base station, in this case Paris. The recommended frequency for communications with the base at a given hour is read off from the point in the map corresponding to the mobile's location.The predictions are made from real time data which are updated each hour.'dash lines' - If present, these delineate areas of unlikely communication. Poor communication areas which can result from one or more of the following conditions:- the Absorption Limiting Frequency (ALF) is higher than the Optimum Working Frequency (OWF).- the ALF exceeds the highest frequency in the user's frequency set. - there is no suitable frequency from the user's set that is between the OWF and ALF.
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