Back from a trip and have had a chance to clean up the software for the LORAN C simulator. So do people generally just attach that to this thread. Say a schematic and basic program. Then thats it??? The simulators very stable and at this point the Austron 2100F goes from acquire to track in about 2 minutes. With the first readout at 1.1 e-11 between the two references that I am using. I am using a gri of 60000 though others can be used. Signal level 48 which is quite strong. By the way schematic wise I suspect final output a gif. Any particular free schematic software people use. I am comfortable with visio so may just use that. Reagrds
On Tue, Dec 8, 2009 at 2:48 PM, paul swed <paulsw...@gmail.com> wrote: > A few weeks back I started a discussion on the demise of LORAN C. It was > quite a long discussion and spawned several others. > I will indeed miss LORAN C as a frequency reference for several reasons. It > was very good more stable then wwvb on the east coast. > And for 10 years I have had 3 austron 2100 and 2100f frequency monitors. > I used LORAN C to set my RB standards. Granted I also have GPS using the hp > 3801. > So with the shutdown in Jan I hated junking the Austrons they are nice > comparators. > Recently, 2 days ago I set out to see if a LORAN C simulator could be > created that was simple, effective, and inexpensive. Using very common parts > and minimum of wiring. > It would appear that it can be done. > > What I am using is 5 cmos chips CD 4000 series gates and counters and a > parallax SXb micro programmed in basic. > These have allowed me to emulate the master stations and the GRIs along > with the phase reversals needed to identify a master. > Using 2 RB standards a HP5065a as the master to the simulator and a cel > tower RB pull and both had been set to LORAN C and checked with GPS the > austrons tracking the simulated LORAN signal in 1-7 E-12th range as > expected. > > This is very fresh data as this has been running about 5 hours now and > there could be issues. > More time is needed to cleanup the software about 100 lines of easy code > thats simple and consistent in operation. (Read this as not tricky and > really boring) > Other comments the waveform is simple no attempt has been made to actually > create the wave shape. (Part of the KISS principle) > I really wanted to see what I could get away with. Still do wonder if I > need the phase reversals. > > Now if there is interest I will need to figure out how to share the details > and code. > Will be on a business trip for the next few days so may not see a reply. > Regards > Paul > _______________________________________________ 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.