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

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Jul 15 17:17:28 EDT 2015


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In message <CAD2JfAi8yKHzQYci++PR8cezMGWY+Fh3EDUsGWFYSDe50fFzfg at mail.gmail.com>
, paul swed writes:

>I don't know if there was. But the timing receivers like the Austrons and
>SRS could really derive very accurate frequencies especially if you lived
>60 miles from the transmitter. :-)

Distance makes a lot of difference.

Short is good, in particular if there is no major variable water
(lakes or groundwater) between you and the transmitter.

The only downside to really short distance is that the sky-wave
comes crashing down in no time, so tracking on the 3rd zero-crossing
is very important.

I have an animation showing typical skywaves at around 200km distance
from Sylt here:

	http://phk.freebsd.dk/AducLoran/animation2.gif

When skywaves are bad, they are as high or higher amplitude as the
grounwave and arrive earlier than usual, but I have not managed to
capture that and the capture process I use is to resource intensive
to run constantly.

-- 
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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