[time-nuts] Loran C returning to a station near you...

Bob Camp kb8tq at n1k.org
Tue Jul 14 17:56:11 EDT 2015


> On Jul 14, 2015, at 12:35 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> Poul-Henning,
> On 07/14/2015 06:16 PM, Poul-Henning Kamp wrote:
>> --------
>> In message <55A4AC81.1030100 at rubidium.dyndns.org>, Magnus Danielson writes:
>>> The safety is
>>> relative, in that it takes quite a bit of more infrastructure compared
>>> to the jamming of GPS, and that lies in the wavelength of the signal
>>> than anything else.
>> If the goal is a reliable backup for GPS, there are smarter ways to
>> use the 100kHz band than Loran-C pulses, and there really isn't much
>> reason to stay compatible with Loran-C receivers.
> True. I would look at PRN-codes if I where to do such a system today.
> What may be an issue is the amount of sidebands allowed, as it would put limits on the chipping-rate of PRN-codes or for that matter other forms of modulations.

If you look at the spectral width of the existing Loran-C (or similar) waveform, it’s a massive thing. You would have a hard time coming up with something that spreads
more crud around the VLF range.


> I think another approach was being considered for the LORAN-rebuild in the US. I don't remember from the top of my head when it was discussed or link to the article.
> Cheers,
> Magnus
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