Today's Topics:
1. How do I measure oscillator frequency using 1pps? (David Kirkby)
2. Re: How do I measure oscillator frequency using 1pps?
(John Ackermann N8UR)
3. Re: How do I measure oscillator frequency using 1pps? (Javier)
4. Re: How do I measure oscillator frequency using 1pps?
(Brooke Clarke)
5. Re: How do I measure oscillator frequency using 1pps?
(Tom Van Baak)
6. Re: How do I measure oscillator frequency using 1pps?
(Poul-Henning Kamp)
7. Axiom Sandpiper II (Mike Feher)
8. Re: How do I measure oscillator frequency using 1pps?
(Bill Janssen)
I'd suggest you look at my "Timing for VLBI" tutorial at
http://gpstime.com -- specifically fetch the latest 2005 version.
Also if you need to get a 10 MHz oscillator to make 1PPS pulses, I
highly recommend the simple PIC-based divider developed by Tom Van Baak;
I can't find it on Tom's leapsecond.com any more, but Brooks Shera has
it at http://www.rt66.com/~shera/ppsdiv.zip
<http://www.rt66.com/%7Eshera/ppsdiv.zip>. [Tom -- can you post where
the master copy now resides?]
Finally, if you want more "why" detail, I recommend that everyone MUST
have a copy of the old HP application note #1289, "the Science of
Timekeeping" (of course the relevant divisions at HP are now part of
Agilent). If you don't have a copy, I've posted it at
http://mysite.verizon.net/w3iwi/hpan1289.pdf. Also at that site is HP's
1272 document "GPS and Precision Timing Applications" at
http://mysite.verizon.net/w3iwi/hpan1272.pdf.
Tom Clark
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