[time-nuts] 10MHz LTE-Lite - PPS accuracy?

Laszlo Hanyecz laszlo at heliacal.net
Wed Dec 10 13:55:25 EST 2014


Is it a bad idea to have more than one PPS source on a single machine?  Would this cause additional jitter when trying to compare the timestamps on two sources?  I understand that USB can't deliver a real PPS, but what about using onboard serial ports or a PCI card?


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Paul
Sent: Wednesday, December 10, 2014 18:43
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

On Wed, Dec 10, 2014 at 12:17 PM, <gigneil at gmail.com> wrote:

> Quite simply - if you either execute ldattach pps /dev/ttyUSBx, or are 
> running GPSD (recommended) it will bind the USB appropriately to a 
> ppsapi instance.

I can get a /dev/ppsN but ppstest says time-out.  I saw some hints that the USB DCD

might depend on the chipset .  I don't like gpsd so I try to avoid it but I might try it.


> Do not do it.  You will not approve of the results.

I don't intend to use it in production.
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