[time-nuts] Another "atomic" clock question

Bob Stewart bob at evoria.net
Mon Mar 3 19:55:14 EST 2014


That's a pretty interesting idea.  It makes me wonder if it would be worth it to switch perhaps a 1/2W heat source (random number) off and on over the XO in the UT+ say every minute or so.


> From: Tom Van Baak <tvb at LeapSecond.com>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Monday, March 3, 2014 6:40 PM
>Subject: Re: [time-nuts] Another "atomic" clock question
>Sure. In fact you can loosely phase lock it to GPS that way. Your xtal doesn't need to have an EFC pin. You are using external temperature as a replacement for EFC. Call it TFC (temperature frequency control) instead. You can't get much simpler than that. Make sure to use a plain XO (not a TCXO or OCXO).
>I used a resistor heater to bust hanging-bridges: http://leapsecond.com/pages/vp/heater.htm

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