Tom, The most direct and quickest way I observe this is from GPScon (also use LH). I also constantly monitor one or the other GPSDO setups with an SR620 (zero crossing technique) with an LPRO-101 as the reference. I use an Tektronix monitor display on the SR620 so I can watch deviation from reference and ADEV (sort of) typically on 24-hour window. A rough visual of the 20ns/div graph or a more accurate analysis on the SR620 dump agrees closely with the GPScon values. I want to use the best GPSDO setup for the SR620 reference instead of the LPRO to improve the PN floor. During these measurements, I currently anticipate having to disabling diciplining if I cant get a very long TC. Regards... Don
________________________________ From: Tom Van Baak <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Monday, July 13, 2009 5:09:55 PM Subject: Re: [time-nuts] Trimble Thunderbolt setup optimization andaddinga10811 OCXO Don, When you say you see about 3 nSec standard deviation, where is this number coming from? As reported by a program like GPScon or LH, or an actual measurement of the 1pps or 10 MHz output against a lab standard? /tvb _______________________________________________ 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.
