[time-nuts] Loran C shutdown

J. Forster jfor at quik.com
Wed Nov 11 17:20:41 UTC 2009


Hyperbolic, not parabolic.

-John

========

> 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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