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

J. Forster jfor at quik.com
Sat Jan 8 04:18:48 UTC 2011


How did you do the GRI counter? I'd like to use an N8290A chip as a
programmable decade counter, but they are obsolete.




> 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.
> Regards
> 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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