Hi There may be a gotcha.
If that HP box has their standard time base in it, your idea isn't going to work. The normal HP approach is to lock a local oscillator up to the incoming reference input. That way they can handle a bunch of different time base inputs without much bother. Their standard VCXO does not have enough range to lock to a reference 0.03% off frequency. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brian Kirby Sent: Thursday, January 14, 2010 10:13 PM To: precise time Subject: [time-nuts] Sidereal time I would like to have an electronic clock to keep sidereal time. I am planning on using a HP 59309A, which can except an external clock of 1/5/10 Mhz. According to Wikipedia sidereal time is 23 hours 56 minutes and 4.091 seconds - a total of 86,164.091 seconds So 86,400 seconds for a normal "atomic defined" day divided by 86,164.091 = 1.002,737,903,89 If I set the 59309A to 10 Mhz external clock and dial a synthesizer up to 10.0273790, the unit should be able to keep sidereal time. Is my math and theory correct ? Brian - KD4FM _______________________________________________ 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.
