-------- Pieter-Tjerk de Boer via time-nuts writes: > > I never managed to decode the data stream usefully, and years > > later I learned that they transmitted "an evolution" of M.589, > > without telling anybody, because they assumed they had the > > only handful of receivers in the world. > > I don't think that "evolution" can have made much of a difference. > I wrote a decoder based on ITU M.589-3 back in 2019, and it has been happily > decoding Anthorn's eLoran (Eurofix) transmissions ever since: I played with it 25 years ago, and as I remember it, the NELS eLoran experiments were run by a group from a (dutch?) university, which were also the people who wrote M.589 and got it through ITU's process. I had very little luck communicating with that group, and I was left with the impression that they expected their startup to corner a huge market - and were maybe a little bit less than thrilled to learn that a hobbyist had written a decoder independently? As far as I know, Antorn is run by an entirely different crew, but I dont know if they use the modulator and code generator from the original NELS experiment or if they have done their own thing. And again: I have no idea if the US experiments even use M.589 ... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.