[ntp:questions] serialPPS+gpsd+ntpd large offset & jitter

Richard B. Gilbert rgilbert88 at comcast.net
Fri Jan 14 21:05:43 UTC 2011


On 1/13/2011 8:08 PM, Chris Albertson wrote:
> On Thu, Jan 13, 2011 at 3:59 PM, Mike S<mikes at flatsurface.com>  wrote:
> de-facto' timer hardware for IA-PCs."
>>
>> If trying to improve the system time stability of a PC, the first thing to
>> look for is a 14.31818 MHz crystal
>
>
> I just now did a parts search at Digikey for the best posable 14.31818
> MHz crystal to put on a PC motherboard.  The one I found was a 10ppm
> part made by a company called "TXC".  It was also an exact match to
> the part I salvaged from the dead board.
>
> So it seems the only way to get better is to build some kind of
> disciplined oscillator likely based on GPS.  It would not be hard to
> build one that is 1000 times better than 10ppm
>

Have you considered temperature control?  Try putting the crystal in a 
home made "oven"?  All you have to do is to ensure that the crystal is 
maintained at a constant temperature.

The tighter the temperature control, the more stable the frequency will be!




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