[time-nuts] Re: long term eLORAN time-transfer monitoring results?

[Pieter-Tjerk de Boer]

On Sun, Aug 03, 2025 at 12:02:03PM +0000, Poul-Henning Kamp via time-nuts wrote:

> The original eLORAN on the NELS chain used the modulation described in
> ITU recommendation M.589:
> 	https://www.itu.int/rec/R-REC-M.589/_page.print

> 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:

  1754601250.572 CRC_ok 16277523140529197b5d UTC: 2025:218_21:14:10.62990
  1754601252.591 CRC_ok 0c3c5f2e7f1c29656421 message, type 12 caa4e7f5d7de0c
  1754601254.611 CRC_ok 113501407d7f40315526 DGPS correction, satellite 0
  [...]
  1754601274.804 CRC_ok 54440e45094b027f472a Station: ref=549 health=6 eLoran Y secondary GPS ref. Lon. -3.28764
  [...]
  1754601335.383 CRC_ok 54440e0b6f592e10012a Station: ref=549 health=6 eLoran Y secondary GPS ref. Lat. 54.9114

(But as previously noted, the US stations may well use a different format.)

Regards,
  Pieter-Tjerk, PA3FWM