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Discussion of precise time and frequency measurement

True Position Time Figure of Merit

Stephan Flor

Tue, Oct 17, 2017 10:03 PM

Hi,I have been trying out my True Position GPSDO, and I have a few questions. I have been running the survey for about 32 hours, and the figure of merit goes between 2 and 4, usually 3 or 4, (range of 1-7). I have been monitoring the frequency adjusting voltage, and it varies between 2.1800 and 2.1900 v( 0-4v range). My unit has the Bliley oscillator.
Does it have to be doing a survey to adjust the frequency? Is this behavior normal? How long should I expect to wait for a figure of merit of one?
Thanks,Steve

Hi,I have been trying out my True Position GPSDO, and I have a few questions. I have been running the survey for about 32 hours, and the figure of merit goes between 2 and 4, usually 3 or 4, (range of 1-7). I have been monitoring the frequency adjusting voltage, and it varies between 2.1800 and 2.1900 v( 0-4v range). My unit has the Bliley oscillator. Does it have to be doing a survey to adjust the frequency? Is this behavior normal? How long should I expect to wait for a figure of merit of one? Thanks,Steve

Bob kb8tq

Wed, Oct 18, 2017 2:36 AM

First thing to check with any GPSDO is the number of sat’s in view. If it does not typically run
6 or more, the survey will take a long time.

Bob

On Oct 17, 2017, at 6:03 PM, Stephan Flor via time-nuts time-nuts@febo.com wrote:

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Hi First thing to check with any GPSDO is the number of sat’s in view. If it does not typically run 6 or more, the survey will take a long time. Bob > On Oct 17, 2017, at 6:03 PM, Stephan Flor via time-nuts <time-nuts@febo.com> wrote: > > Hi,I have been trying out my True Position GPSDO, and I have a few questions. I have been running the survey for about 32 hours, and the figure of merit goes between 2 and 4, usually 3 or 4, (range of 1-7). I have been monitoring the frequency adjusting voltage, and it varies between 2.1800 and 2.1900 v( 0-4v range). My unit has the Bliley oscillator. > Does it have to be doing a survey to adjust the frequency? Is this behavior normal? How long should I expect to wait for a figure of merit of one? > Thanks,Steve > _______________________________________________ > 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.