Quote:
Originally Posted by 69harley
Military Automatic Link Establishment (ALE) and LPI/LPD work sort of different from each other. With the legacy HF radios, ie 74,70, 104, the base station would monitor a bunch of freqs and outstations would select the best one for them.
ALE sort of automates the process and allows a single radio in the base station to monitor a bunch of freqs. The radios ping each other, score the channel quality and then link on the best channel. LPI/LPD adds a slight variation in that once the radios link on a chennel, they then begin to hop around, going higher and lower than the center freq.
So yes, freqs are still programed into the radio, but they are not always 'fixed'.
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Correct, the two different ALE's are SOF ALE (which is also LPI/LPD) which scans the spectrum and links up automatically without preprogrammed freqs and MIL STD ALE, which you program a set of hopefully useable freq's and it scans those freq's to link up.