[time-nuts] Simple solution for disciplining OCXO with 1 PPS

Bill Hawkins bill.iaxs at pobox.com
Mon May 23 02:40:44 UTC 2016


Well, if you're open to something completely different, consider using a
motor-driven potentiometer that provides a trim voltage to the OCXO.
Adjust the motor at long intervals, leaving it off the rest of the time.
It's called sampling control.

You'll need to have an analog phase comparator for 1 PPS that has enough
volts/degree to provide a useful error signal to the motor controller.

Bill Hawkins


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bernd
Neubig
Sent: Sunday, May 22, 2016 12:41 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

Hello Fellow time-nuts,
I am looking for a simple solution to discipline my 10 MHz reference
OCXO in my private lab with an 1 PPS signal from a separate GPS
receiver.
I am curious if there is a solution possible without programming a
microcontroller, as I am an old-fashioned "analogue" guy ;) I am well
aware, that such a solution would have a lot of disadvantages, as it
cannot effectively compensate for short-term variations. However I would
be happy if such a KISS solution could achieve  a stability (STS) of
better 1E-10 over an hour. I know this is a damned long integration time
for an analogue integrator...
If that sounds too weird, I am open to receive advises for a
microcontroller based solution.

Thanks a lot for your comments to come.
BTW: you need not to teach me about basics of short-term stability. I
just want to evaluate the limits of a possible analogue solution. For
sure, that's not real disciplining, but more like a long-tau integration
PLL

Best regards
Bernd DK1AG

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