[time-nuts] eLoran test 6 Feb for almost 2 months

Bob Camp kb8tq at n1k.org
Sat Feb 4 14:13:26 EST 2017


The Russian system runs an incompatible pulse format. A “normal” Loran receiver 
pretty much pukes when you try to tune to the Russian chains. It also is a bit unclear
just how stable their system is timing wise. 

For timing you *need* ground wave. Anything that is more than 1,000 miles away is
not going to do much good in a timing system. To me this is one of the basic issues
with a eLoran system that only operates out of a single location. I’m happy with it if 
it’s in the north eastern part of the US. I’d be really bothered if the only transmit location 
was in Nevada …. 

Yes once upon a time I had data on the Iceland chain as received in Ohio. I did it more
as a “because I can” than anything else. There were periods that things looked ~ok and
lots of gaps where they didn’t look very good at all. If I had not already calibrated the 
local standard against a nearby chain … no way to figure out which data was correct. 


> On Feb 4, 2017, at 3:05 AM, Ruslan Nabioullin <rnabioullin at gmail.com> wrote:
> On 02/03/2017 09:53 AM, Bob Camp wrote:
>> With reasonable gear, you can pick up the European Loran chains in
>> the US on a regular basis. You can also pick up the Russian system
>> that runs on the same frequency. The gotcha there is that you are
>> looking at “skywave” rather than “ground wave” signals to some
>> degree. That degrades their value for timing or for navigation. (Yes,
>> it is all a lot more complicated that than very simple / quick
>> summary).
> Oh wow, I did not know that LORAN reception is adequate over such long distances.  So Chayka is essentially compatible with Loran-C frequency transfer receivers?  And is it still online?  If so, it could be used as a fallback in the unfortunate case that eLORAN R&D projects in the US fail.
> -Ruslan
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