The external input triggers logic (via a selectable divider). It would easily go +/- 50% in frequency.
Artek Media has the manual. -John ============= > 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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > > _______________________________________________ > 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. > > _______________________________________________ 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.