GPS确实这点不好，好多机房用CDMA同步，但是CDMA授时模块比GPS贵多了。。
天线长点应该没事那还是个active antenna。但是当时那根好像略短 没有单独搞原子钟意义不大，一天能差40us的样子。至少一个月得和GPS对准一次。 On Friday, February 10, 2017 at 9:04:23 PM UTC-7, Justin Wong wrote: > 机房在地下呢…… > > -- > Justin Wong > > On Sat, Feb 11, 2017, at 12:01, Wang Kang wrote: > > 引个天线甩到楼顶上? > > > > 不过，GPS天线是不是不能过长? 会影响同步精度? > > > > -- > > Wang Kang > > > > On Sat, 11 Feb 2017, Justin Wong wrote: > > > > > 那套 GPS 设备一直在我手上呢，可惜因为 GPS 的缘故，找不到地方 serve > > > > > > -- > > > Justin Wong > > > > > > On Sat, Feb 11, 2017, at 11:50, Wang Kang wrote: > > >> TUNA的那套原子钟(铷钟还是铯钟我不记得了)就是陆四荣捐赠的... (大约四年前) > > >> 貌似还有一套GPS模块，接到计算机的并口上，用硬件中断触发同步。 > > >> > > >> 不过由于我没有努力工作(<---没错就是这个人)以及那段时间机房条件不太好，这套东西一直没有好好跑起来>_< > > >> > > >> -- > > >> Wang Kang > > >> > > >> On Sat, 11 Feb 2017, Xavier Yao wrote: > > >> > > >>> 是的，机房条件暂时不允许我们连GPS模块。 > > >>> > > >>> ---------- > > >>> 姚沛然 > > >>> Peiran Yao > > >>> > > >>>> From: thulsr07 <[email protected]> > > >>>> Sent: Saturday, February 11, 2017 6:35:12 AM > > >>>> To: TUNA 主邮件列表 > > >>>> Cc: Mirrors Administrators > > >>>> Subject: Re: TUNA NTP 服务重新上线了！ > > >>>> > > >>>> 很高兴看到NTP服务器重新上线！ > > >>>> > > >>>> 所以目前这个并没有直接连接GPS模块，而是一台stratum 2的中继对吗？因为我看到ntp的refid是一个境外的IP地址。 > > > > -- > > > > --- > > You received this message because you are subscribed to the Google Groups > > "TUNA 主邮件列表" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > For more options, visit https://groups.google.com/d/optout. -- --- You received this message because you are subscribed to the Google Groups "TUNA 主邮件列表" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
