I pretty much doubt the SB ever went to the phase level. Really no need for that the average offset and detection point on the AM signal was good enough. I have done what was suggested just modulate a 1Khz signal though I did use an xtal oscillator. It worked fine. Regards Paul.
On Tue, May 14, 2013 at 1:04 PM, Esa Heikkinen <[email protected]> wrote: > Chris Albertson kirjoitti: > > NTP will so this. There is an IRIG reference clock. You really do >> want to use NTP to discipline the PC's clock. Almost every other >> method is worse and causes time discontinuities. >> If you happen to have TTL level IRIG it s very easy to convert it to >> amplitude modulated IRIG. The standard is a 1KHz tone. >> Build a cheap 1KHz oscillator. A 555 timer is good enough. Then you >> a single transister if IC time switch to modulate the amplitude of the >> signal. The details are not critical. >> > > That's good idea if the phase of the 1 kHz signal is not critical? > > I checked the IRIG-B signal with oscilloscope and looks like the 1 kHz > signal's phase is locked to the time signal. The bits will always start and > stop at exactly same phase. That makes sense because with phase detector it > could be possible to get very accurate timing from the 1 kHz signal - much > better than following the amplitude only. That's one reason why I was > interested about chipsets; if they can follow the phase also. I think if I > design any hardware for that it should follow the phase also? It may be > complex... > > Does anyone know if the soundcard based IRIG decoder will follow the phase > also, or only the amplitude (?) > > -- > 73s! > Esa > OH4KJU > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
