[time-nuts] Lowest Power NTP Server

[Robert LaJeunesse]

If wired Ethernet seems to be the way to go consider the Orange Pi Zero - about the cheapest wired Ethernet board available that runs Linux. Ethernet is via on-chip MAC and phy, so no USB path delays. http://www.orangepi.org/orangepizero/

Plenty of support exists on the web, for example: https://lucsmall.com/2017/01/19/beginners-guide-to-the-orange-pi-zero/

Bob L.

> Sent: Monday, December 02, 2019 at 9:56 AM
> From: "Tim Shoppa" <tshoppa at gmail.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Lowest Power NTP Server
>
> Bob, I find that 2.4GHz Wi-Fi UDP latency with ESP8266 will frequently be
> tens of milliseconds and is never/rarely consistent.
> 
> There are specialized non-WiFi 2.4GHz systems for time distribution that
> are far more consistent (possibly even at the tens of microseconds). I
> think several years ago on this list, we were talking about tricking
> commodity WiFi chipsets into doing these but haven't seen anything as of
> late.
> 
> Tim N3QE
> 
> On Mon, Dec 2, 2019 at 8:02 AM Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> > Hi
> >
> > Indeed, if you get up into the “many tens” of  ms, that rules it out in my
> > application.
> > A consistent 90 ms would be ok, you could compensate for that. Random
> > flopping
> > from 4 to 90 … not so much.
> >
> > It seems like that sort of jitter would get in the way of a lot of things.
> > I guess that just
> > shows how little I know about a lot of things :)
> >
> > Bob
> >