[time-nuts] eLORAN will be on air GRI 99600

[paul swed]

John it did indeed go to 1us not sure when. Definity a requirement in
Europe.
But the Austrons and SRS demand it. Not sure the old Austron 2000 did.
But that was a pain to use. Actually useful to have a scope while setting
it up.

I also designed my first LORAN C receiver but for frequency locking
something like 1985 or earlier. It did use cmos chips but not a micro.
Because its job was to lock an oscillator I only needed one master and no
slaves. Much of my knowledge came from a fellow named Ralph Burhans.

Regards
Paul
WB8TSL
I ran into the A&B group when building the loran c simulator. ooops.
Regards
Paul
WB8TSL

On Fri, Aug 7, 2020 at 4:24 PM John Ponsonby <jebponsonby at gmail.com> wrote:

> When I designed and built my LORAN-C receiver, for navigation not precise
> time, it was my understanding that all GRI's (Group Repetition Intervals)
> were expressed as four digit numbers. I designed my receiver accordingly.
> The number was the repetition time in units of 10 microsecs. This is the
> period of one cycle of the RF signal. so the RF is coherent from group to
> group. (The groups are not all identical. There are alternately A groups
> and B groups.) I notice that in the present discussion the GRI is given to
> five digits. Does any one know if the change to five digits, which are
> presumably the time in microsec, is so to speak official?
>
> John P
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