Hal Murray wrote. >How good were crystals back in WW II time frame?
>Does anybody know anything about early Loran? I'm guessing that the >secondary stations listened to the primary and sent their pulse X >microseconds after they heard a pulse. How did they implement that delay? >What sort of filter/PLL did they have on receiving the primary station? >What is current Loran navigation accuracy? What was it like in the old >days? Each station in the old loran system used a different pulse rate. You could hear the pulses walking across one another giving a rising and falling sense of rate. There was some frequency diversity as well. I never really understood how the old system worked. In the 60s a carefully designed ovened crystal oscillator could do about 1 part in ten to the ninth. In WWII I suspect it was an order of magnitude worse. Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: "Hal Murray" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, July 13, 2008 3:43 AM Subject: [time-nuts] Old Loran > > I found this interesting. It's a chunk of the memoirs of a Coast Guard > Captain who was in charge of Loran in Japan from 1961-1964. > > http://www.uscg.mil/history/WEBORALHISTORY/CAPT_David_Sinclair_29.html > > It's half Coast Guard history/nostalgia, half his memories of Japan, and a > little bit of Loran. But I thought that little bit was neat. > > How good were crystals back in WW II time frame? > > Does anybody know anything about early Loran? I'm guessing that the > secondary stations listened to the primary and sent their pulse X > microseconds after they heard a pulse. How did they implement that delay? > What sort of filter/PLL did they have on receiving the primary station? > > What is current Loran navigation accuracy? What was it like in the old > days? > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > 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.
