> Loran c was complicated by the fact that there were phase reversals in the > patterns that had to be emulated it doubled the size of the code. But to > answer your question John its all done in simple readable basic language. > Think of it as a endless loop pattern. The real trick is using a good > reference. I think Magnus said 10 KC. What you do is count the 10 KC > reference. Using a Parallax SXB chip that can run all the way up to 80 > Mhz. > The code runs so fast that 99.9% of the time the micro is just waiting and counting edges.
OK. Thanks. You talk to the uP with a dumb terminal program? > I like to create dumb simple stupid, reliable as heck programs like that. > The Loran C sim allows the Austrons to compare to their limit of 1 e -13. > There is a bit more cleverness in the C simulator external to the > program. > > I thought there were different frequencies at about 1.8 Mhz. There are 3 between 1.8 and 2.0 MHz, one higher that was mostly unused. > I remember the gone-ometer (I still think thats a disease sailors can > get), green crt black box about 2 ft tall. That's for a DF loop, no? Was that used on the LORAN receiver? If so, that's news to me. The crossed roughly 4' loops were common on ships, but I didn't think they were LORAN antennas. > If you really wanted to do a location you might need 2 or 3 chips at > different GRIs and phases. But at $3.56 not a really big deal. Lastly > there > must be some overall sync relationship between the chains that has to be > maintained I might guess. I'm not sure about inter-chain sync, but IMO it does not matter much. > Oddly enough I emailed the group several times at the ship and never > received a response. > Figured they were all set. > Regards > Paul. If you're interested, I can make sure you talk to the right person. Best, -John =============== _______________________________________________ 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.
