Different "types" of HF Radios"
Over on R&N, in the Air France aircraft loss thread, someone was talking about the "ancient HF" in the S. Atlantic,and the "modern HF" over Australia (I can't quote, as I read all the way through in the hope of someone picking it up and I could never find the posts there again!)
Is there a different technology over Australia, that would help HF comms get through all the noise of an electrical storm? To my knowledge, there's basically only FM, AM, and SSB (unless aviation HF radios have gone digital??).
In addition to my interest in aviation (BA's Cranebank Centre for many years, as well as building sims with Link in Lancing), my main hobby is radio, and the comments there intrigued me. Can anyone tell me if the Aussie HF systems are significantly different to the African/S.American?