I don't think the people here understand what you have here but luckily I do: this is a LORAN *A* receiver NOT *C* (and its derivative eLORAN): the latter runs on longwave from 90-110 KHz (center 100 which is conveniently a 3km wavelength) while whats being demonstrated runs on today's 160m band. Its also why old HF amps like the Heathkit SB-200 dont have Top Band: hams were forbidden to interfere with the system. Decca is a related system also. If y'all would just visit the Wikipedia articles you could learn a lot!
This was fantastic!! My fathers boat had a LORAN C unit, had 2 LCD displays for N/W and it was an amazing device until they shut it down here in the USA what somewhere late 1990s or early 2000s maybe. I never have seen anything quite like this unit you have with a CRT o-scope built-in that is so cool thanks for sharing
LOL I admit, your title had me, I'm thinkin' WHEN was the last time I hear any LORAN on the air? A good friend of mine spent some time way out in Maine at a station, Caribu. We met in 68 at Treasure Island at the amateur club there, K6NCG. Look that up there are photos. He was E-5, going to B school, and I was E -nuttun out of boot, going to ET-A school. He later transferred to USCG, and may have spent more time at sea in the CG than if he'd stayed Navy.
jproc.ca/hyperbolic/loran_a.html You can see on this page a map, with hyperbolic delay curves. You find which curve is marked with the received delay time, and then do another fix from another master-slave pair, to get your position. This is LORAN-A, from WWII. Latitude and longitude are on maps along with LORAN master-slave station pairs, and their hyperbolic delay curves: archive.org/details/dr_usaf-special-loran-chart-ls-103-central-north-atlantic-area-3rd-editi-11626000 There would also be more local maps and charts to get your position down to 1/2 mile.
There will be no comeback for this, ever. All transmissions can be jammed or destroyed, including the jammer itself. If positional information is mission critical, you'll be using inertial systems coupled with fixes from a myriad of sources, some optical, some radio, some audio.
eLORAN is ALREADY in operation as Navy testing program, expected to be approved by Pres. Trump. TEST RESULTS: tedstevensarcticcenter.org/wp-content/uploads/2023/09/eLoran-Overview-ICE-PPR-Trails-March-22.pdf Introduced in U.S. Senate (12/12/2017, 2018) National Timing Resilience and Security Act of 2017 A significant advantage of eLORAN is that it is tough to spoof or jam, especially from a large distance. In contrast, the equipment required to spoof and jam GNSS must only mimic very low-powered satellite signals. Spoofing and jamming eLORAN requires very high-powered transmissions across a vast area. In addition, eLORAN implements an authentication system and broadcasts an anti-spoofing signal. It is considered secure and practically un-jammable, and can penetrate nearly all structures across all weather conditions. The reported accuracy is as good as 8 meters, making it competitive with unenhanced GPS. It also meets the performance requirements for non-precision instrument approaches in aviation. Additional arguments for eLORAN are that it is a terrestrial-based system instead of requiring (expensive) geostationary satellites. eLORAN also operates in a very low-frequency band instead of GNSS working in the (very) crowed Ultra High Frequency band. As eLORAN uses high-power transmissions, its signals are three to five million times stronger than those of GPS/GNSS and have 99.999% availability and reliability. The signal can penetrate buildings, and works indoors and even underground/underwater. Lastly, it is largely unaffected by cosmic interference and space weather phenomena.
True the Holy Grail is 100% inertial navigation (dead reckoning) but even now it's only accurate for so much time before needing to be reset. That bootstrap has to come from somewhere. The thing you don't understand about (V)LF is that the power & antenna size required makes it VERY difficult to jam unless you can get very close to the receiver.
Given the power used by LORAN transmitters (100s of kW - 1MW+), and extreme antenna size required, jamming is inordinately difficult unless you're within very close range of whatever receiver you intend to jam.
I don't think the people here understand what you have here but luckily I do: this is a LORAN *A* receiver NOT *C* (and its derivative eLORAN): the latter runs on longwave from 90-110 KHz (center 100 which is conveniently a 3km wavelength) while whats being demonstrated runs on today's 160m band. Its also why old HF amps like the Heathkit SB-200 dont have Top Band: hams were forbidden to interfere with the system. Decca is a related system also.
If y'all would just visit the Wikipedia articles you could learn a lot!
I still have my King LORAN C receiver that came out of an airplane. It was super accurate and worked in Central USA.
I flew with an operating LORAN box in TX November-December 2001. A couple of years after that it was turned off
This was fantastic!! My fathers boat had a LORAN C unit, had 2 LCD displays for N/W and it was an amazing device until they shut it down here in the USA what somewhere late 1990s or early 2000s maybe. I never have seen anything quite like this unit you have with a CRT o-scope built-in that is so cool thanks for sharing
Cough cough, Obama..
@@aerodicus lol
LOL I admit, your title had me, I'm thinkin' WHEN was the last time I hear any LORAN on the air? A good friend of mine spent some time way out in Maine at a station, Caribu. We met in 68 at Treasure Island at the amateur club there, K6NCG. Look that up there are photos. He was E-5, going to B school, and I was E -nuttun out of boot, going to ET-A school. He later transferred to USCG, and may have spent more time at sea in the CG than if he'd stayed Navy.
Very cool. Are you using a noise filter? Is that what is causing the amplitude flutter?
Good job!, thanks for sharing this. 73
Awesome ! Thanks for sharing !
So, what just happened?
Where does it tell you you latitude and longitude?
jproc.ca/hyperbolic/loran_a.html You can see on this page a map, with hyperbolic delay curves. You find which curve is marked with the received delay time, and then do another fix from another master-slave pair, to get your position. This is LORAN-A, from WWII. Latitude and longitude are on maps along with LORAN master-slave station pairs, and their hyperbolic delay curves: archive.org/details/dr_usaf-special-loran-chart-ls-103-central-north-atlantic-area-3rd-editi-11626000 There would also be more local maps and charts to get your position down to 1/2 mile.
There will be no comeback for this, ever. All transmissions can be jammed or destroyed, including the jammer itself. If positional information is mission critical, you'll be using inertial systems coupled with fixes from a myriad of sources, some optical, some radio, some audio.
eLORAN is ALREADY in operation as Navy testing program, expected to be approved by Pres. Trump.
TEST RESULTS:
tedstevensarcticcenter.org/wp-content/uploads/2023/09/eLoran-Overview-ICE-PPR-Trails-March-22.pdf
Introduced in U.S. Senate (12/12/2017, 2018)
National Timing Resilience and Security Act of 2017
A significant advantage of eLORAN is that it is tough to spoof or jam, especially from a large distance. In contrast, the equipment required to spoof and jam GNSS must only mimic very low-powered satellite signals. Spoofing and jamming eLORAN requires very high-powered transmissions across a vast area. In addition, eLORAN implements an authentication system and broadcasts an anti-spoofing signal. It is considered secure and practically un-jammable, and can penetrate nearly all structures across all weather conditions. The reported accuracy is as good as 8 meters, making it competitive with unenhanced GPS. It also meets the performance requirements for non-precision instrument approaches in aviation.
Additional arguments for eLORAN are that it is a terrestrial-based system instead of requiring (expensive) geostationary satellites. eLORAN also operates in a very low-frequency band instead of GNSS working in the (very) crowed Ultra High Frequency band. As eLORAN uses high-power transmissions, its signals are three to five million times stronger than those of GPS/GNSS and have 99.999% availability and reliability. The signal can penetrate buildings, and works indoors and even underground/underwater. Lastly, it is largely unaffected by cosmic interference and space weather phenomena.
True the Holy Grail is 100% inertial navigation (dead reckoning) but even now it's only accurate for so much time before needing to be reset. That bootstrap has to come from somewhere.
The thing you don't understand about (V)LF is that the power & antenna size required makes it VERY difficult to jam unless you can get very close to the receiver.
Given the power used by LORAN transmitters (100s of kW - 1MW+), and extreme antenna size required, jamming is inordinately difficult unless you're within very close range of whatever receiver you intend to jam.