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 < [email protected]> 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 > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
