[time-nuts] Loran C shutdown

Dave Baxter dave at uk-ar.co.uk
Wed Nov 11 12:46:40 UTC 2009


Someone may correct me on this. 

But isn't Loran a parabolic navigation system?   So, the further away
from the chain of transmitters you are, the positioning "quality" (for
want of a better word) will deteriorate.   I seem to remember reading
that you need a good spread of directions for the incoming signals, so
you get a decent fix, much like clasic direction finding and reducing
the area of uncertanty.  Too far away, and all the bearings (timings in
this case) tend to one direction.

Any Sky Wave propagation would also mess with the timings, multi hop and
all that.

As above, I stand to be corrected on this.  I may be thinking of another
system of course.

Regards.

Dave G0WBX.


> -----Original Message-----
> Date: Tue, 10 Nov 2009 22:44:27 -0500
> From: paul swed <paulswedb at gmail.com>
> Subject: Re: [time-nuts] Loran C shutdown
> To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Message-ID:
> 	<ac803ca80911101944g12da250ft11db1fe55f530683 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Well that's what I am thinking about also.
> Earlier in this thread there was a mention of Europe.
> This would be a sky wave only signal as I recall from the navy.
> So I have g3plx LORAN software and will look to see what I 
> might get here on the east coast.
> Suspect the Canadian chains will go very quickly since part 
> of them uses the US chain.
> Or simpler then the g3plx software, just plugging in the GRI 
> for the European chains.
> Have 3 austron receivers, the 2000c, 2100, and 2100f.
> 
> 
> On Tue, Nov 10, 2009 at 8:36 PM, Claude Houde <va2hdd at aei.ca> wrote:
> 
> > Hello !
> >
> > Before you throw away your Loran Receivers, have you 
> checked what will 
> > happen with the Canadian Transmitter Chains ?
> >
> > Would it be possible with better antennas to receive signals from 
> > other countries ?
> >
> > Would be interested in hearing your input on these ideas !
> >
> > Thanks !
> >
> > Claude




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