Paul, How did you do the GRI counter? I'd like to use an N8290A chip as a programmable decade counter, but they are obsolete.
Best, -John =============== > 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 < > mag...@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 >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.