[time-nuts] Loran C returning to a station near you...
Poul-Henning Kamp
phk at phk.freebsd.dk
Thu Jul 16 02:13:51 EDT 2015
--------
In message <07538A701D6E4F8D804BD567DD794693 at gnat>, "Alan Melia" writes:
I mean that a Loran-C signal designed as I proposed in a previous
email would not do that, because it wouldn't have the groups and
GRI-peridodicties which cause the splatter up and down the band.
>It just depends what you mean by that :-) I could lock to Lessay and Anthorn
>at frequencies in the 136kHz amateur band, using some S/N DSP software
>writen by Peter Matinez G3PLX.
>>>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.
>>
>> The reason Loran-C "spreads crud" is *only* the combinationa of the
>> pulse-groups and the periodicity of the GRI.
>>
>> The pulses themselves are entirely contained inside the allocated
>> frequency band.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at 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.
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