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PostPosted: Wed Sep 20, 2017 10:27 am 
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The new eLoran has an accuracy radius of 26 feet according to Stanford. That's similar to un-enhanced GPS. Is it possible to employ something like this on a more local level? The range on professional systems is huge. 800 kilometers which is enough for you to get from Virginia to Maine. All I'd want is something that would allow me to get back to my bunker after scavenging for supplies or hunting.



https://scpnt.stanford.edu/research/ear ... ch/e-loran

https://arstechnica.com/gadgets/2017/08 ... use-cyber/


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PostPosted: Wed Sep 20, 2017 11:58 am 
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I am not sure there are still operating LORAN chains. I am pretty sure the LORAN C stations were shut down a decade or more ago. You do need more than one LORAN station to get a fix. This is also not a DIY kind of operation. So if GPS were impaired odds are good that any ELORAN stations would need a coded receiver or simply not be available.

If you are looking for a a DIY kind of electronic navigation system. You should consider using a NDB and RDF/ADF. These are still in widespread use especially in isolated areas. It would also be easy to set up an AM transmitter to broadcast continuously (assuming legalities are observed of course) and then use the ADF/RDF to home in on the signal. I have used commercial AM radio stations (in a plane) as an NDB at well over 200 miles away. Of course anyone who hears the signal now knows where the transmitter is located (so expect company in a PAW or better yet locate it 20+ miles away form where you are landing. Then you fly to it and turn to the radial that gets you home. Start your stop watch once you fly over the beacon. Do a quick speed check and math and you know your landing site is x minutes away on a heading of XXX.

Obviously there are lot of other non-electronic navigation methods: dead reckoning, pilotage, celestial and simple bearings on a map and so on. I would note that people were traveling long distances using simple lodestone compasses for centuries before chronometers and sextents were invented.

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PostPosted: Wed Sep 20, 2017 3:29 pm 
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eLORAN has not been funded yet as far as I can tell: http://www.gps.gov/policy/legislation/loran-c/

Related articles:

https://rntfnd.org/2017/05/21/why-congr ... ty-eloran/
https://rntfnd.org/2017/06/07/eloran-an ... gps-world/



LORAN C has been off the air 7 years

https://www.navcen.uscg.gov/?pageName=loranMain


TERMINATION OF U.S. LORAN-C SIGNALS:

In accordance with the 2010 DHS Appropriations Act, the U.S. Coast Guard terminated the transmission of all U.S. LORAN-C signals on 08 Feb 2010.

TERMINATION OF RUSSIAN AMERICAN LORAN-CHAYKA SIGNALS:

The U.S. Coast Guard transmission of the Russian American signal was terminated on 01 Aug 2010.

TERMINATION OF CANADIAN COAST LORAN-C SIGNALS:
The U.S. Coast Guard transmission of Canadian LORAN-C signals was terminated
on 03 Aug 2010.

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PostPosted: Sun Sep 24, 2017 9:32 am 
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ZombieKraft wrote:

The new eLoran has an accuracy radius of 26 feet according to Stanford. That's similar to un-enhanced GPS. Is it possible to employ something like this on a more local level? The range on professional systems is huge. 800 kilometers which is enough for you to get from Virginia to Maine. All I'd want is something that would allow me to get back to my bunker after scavenging for supplies or hunting.


Second the RDF suggestion, and it's much easier when you're hunting your own transmitter since you know the freq and the transmit interval after all. UHF and higher freq systems would be more portable when it comes to the directional antenna you're carrying afield. If you have deep pockets then maybe something like this:

http://marshallradio.com/gulf-region-fa ... ceiver-uhf

Or if you're cheap like me then you can roll your own for a fraction of the cost, a tape measure yagi works well when walking through the woods and packs/stores well when not in use:
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Built using YagiCAD to determine the element lengths for our desired frequency (on VHF), then tested by enabling the ARTS function on our Yaesu FT-2900 radio (so it transmitted every 25 seconds) and heading out for a hike with the HT and yagi. The two drawbacks I found are that the S meter on the HT is very small and difficult to see on the LCD screen, and when close to the transmitter the S meter gets overloaded showing "5 bars" in every direction. So it works well to get a bearing on the transmitter from a long(ish) distance, but would benefit from an attenuator or a much more accurate S meter at close range. Our intended use is for SAR ops so the target wants to be found, and once close enough that the signal overloads the meter you're going to be in yelling/whistle distance anyway. Presumably you'd be close enough to your bunker to know the way home by the time that happened too. And in case anyone is wondering, the Baofeng UV-5r doesn't have a true S meter but just a indicator - it's a full 5 bars or it's off. I believe this is true of all Baofeng models but could be mistaken on that.


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PostPosted: Sun Sep 24, 2017 10:05 am 
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I went back and read the OP's original objective: "All I'd want is something that would allow me to get back to my bunker after scavenging for supplies or hunting."


Good map and compass (land navigation) skills are all that is needed. No need for RDF, GPS, eLORAN, etc.

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PostPosted: Sun Sep 24, 2017 10:44 am 
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One could always place one's bunker in the direction one of these handy concrete arrows are pointing

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