[time-nuts] thermostated 14.31818 MHz

Ulrich Bangert df6jb at ulrich-bangert.de
Mon Dec 8 09:13:16 UTC 2008


For those that are interested in this method:

A read to go crystal heater can be bought from Kuhne Electronics. Look
for

http://www.kuhne-electronic.de/en/shop/155_Crystal_Heater

Best regards
Ulrich Bangert

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Remco den Besten
> Gesendet: Montag, 8. Dezember 2008 00:25
> An: linuxpps at ml.enneenne.com; Discussion of precise time and 
> frequency measurement
> Betreff: [time-nuts] thermostated 14.31818 MHz
> 
> 
> In order to minimise the temperature dependency of my system 
> clock I made a 
> thermostate with an uA723,
> and soldered it on the 14.31818 MHz reference crystal of the 
> system clock 
> PLL.
> 
> The temperature of the thermostate converges to approx. 50 
> degr C and the 
> results are really good for such a simple
> solution. My jitter decreased with an order (approx 10 
> times). With FreeBSD 
> I have 'pps stabilities' of
> 0.001 - 0.003 ppm, whereas 0.020 - 0.050 ppm was observed without the 
> thermostate.
> The PLL offset remains within +/- 1 usec most of the time for 
> my ntp server 
> ntp.remco.org.
> 
> For graphs: see http://remco.org/difference.php
> 
> Remco
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts
> and 
> follow the instructions there.
> 




More information about the time-nuts mailing list