[time-nuts] Simulating LORAN-A GRI Timing Generator

paul swed paulswedb at gmail.com
Sat Jan 8 04:01:58 UTC 2011

John I did the Loran C simulator. But it acted as a single station and its
only goal was to allow austrons and such to do phase comparison of
oscillators. Took only a few chips simple and small.
I was at the tail end of loran A in the navy. Really do not remember
anything about the theory any more.
I was going to speculate on a solution but its to late at night.

On Fri, Jan 7, 2011 at 10:54 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 08/01/11 03:28, J. Forster wrote:
>> I'm looking at building a LORAN-A simulator to run a vintage display.
> Hmm. Generating blips programmed in repetition rate and delay as steps of a
> 10 MHz clock should be sufficient and fairly straight forward. A lower clock
> such as 1 MHz would probably work well (and simplify the design). A
> programmable delay (needs to be 19 bit for 10 MHz and 15 bit for 1 MHz)
> using standard synchronous counters should not be too hard. Once designed
> it's a matter of deciding how many slaves shall be supported. A PIC or AVR
> could do the NMEA position to delay conversions needed, and I mostly worry
> about the math-support on them, which only shows that I haven't done any
> real project on any of them.
>  I used to design stuff with gates and counters by hand, and can still do
>> so, but it's tedious.
>> Does anyboby know of any freeware that can be used to draw up logic and
>> simulate its operation, including propagation delays? I don't need exotic
>> chips or any analog functions. A library of common 74...  and 40.. would
>> be nice.
>> Freeware strongly preferred.
> Eagle, GEDA/GNUCAP, Electric and KICAD would be my main suspects.
> Cheers,
> Magnus
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