> John, > > On 08/01/11 05:04, J. Forster wrote: >> Magnus, >> >> See my post of a few minutes ago. >> >> The GRI and Delay counters need to be 5 decimal digits. My current >> thinking is manual entry of the numbers via BCD coded thumbwheel >> switches. > > If you only need a static location that will be fine. Naturally you tune > it up to the ships current (final?) position. Good exercise for the > visitors. :)
True, and that's the plan. The TDs would vary very slowly when the ship is underway anyway. Not something a visitor would really notice. Roughly, the TDs change a microsecond for every 1/5 mile. Clearly, if the TDs were settable from an external 'puter, a manovercould be simulated, but visitors don't get to twiddle knobs (they steal them), so a static display is probably best. >> LORAN-A has 24 possible GRIs; in three blocks of 33 PPS; 25 PPS; and 20 >> PPS. It also has 4 RF frequencies. > > I did a fashinating read-up here: > http://www.jproc.ca/hyperbolic/loran_a.html Yes, Jerry's site is very good on many things like LORAN and radios and crypto. > GRI is a LORAN-C term if I get it correctly, where as PRR is used > together with frequency indication in LORAN-A. You got me! Yes. GRI = 1/PRF. I prefer to deal with microseconds than 1/9 CPS. >> Currently I plan only one Slave, but a second would be an easy addition. > > Indeed. Considering the chain that used to be there, you could allow for > two chains to be setup on the same frequency (1H chains). > > Cheers, > Magnus Right. Thanks, -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.
