[OZAPRS] Re: [amsat-bb] Online atomic clock

Tony Hunt wavetel at iname.com
Wed Sep 14 09:14:02 EST 2005


Norm .. There must be several ways to set the PC from a GPS clock .. Here
is
one I know of.. The MoonBounce and WSJT boys as well as satellite tracking
fraternity all must do this in some way.. Look here
http://nlsa.com/novagps.html
There are probably feebies that do it as well..

Tony VK5AH

----- Original Message ----- 
From: "Norm, VK2XCI" <vk2xci at aanet.com.au>
To: "amsat-bb" <amsat-bb at amsat.org>; "OZAPRS"
<ozaprs at marconi.ics.mq.edu.au>
Sent: Wednesday, September 14, 2005 8:34 AM
Subject: [OZAPRS] Re: [amsat-bb] Online atomic clock


> Sorry about the cross post, but this is becoming interesting.
>
> Tony Langdon (ATC) wrote:
> >>This recent thread caused me to wonder about the dynamic
> >>nature of the internet and variable propagation delays. Does
> >>anyone know the relative accuracy - at your computer - of
> >>"internet" timing services as compared to "hard-wired" timing
> >>services as are available in many cities in many countries?
> >
>
> For the APRS crowd... does any one have a clue how to discipline the PC
> clock from GPS?? Sounds interesting!
> >
> > For Internet based timekeeping, NTP is your best bet, as NTP does all
it
can
> > to compensate for propagation/packet delivery delays.  For specs, the
RFC on
> > NTP (it'll be a heavy read :) ) will tell you the answer, but I
believe
the
> > accuracy can be surprisingly high, especially if you choose a time
server
> > that's relatively close to you and then use full NTP (rather than
SNTP)
to
> > that server. SNTP is good for sycing between a gateway time server on
your
> > LAN and all the other PCs, if acuracy is important.
> >
> >
>
> snipped...
>
> FWIW, I use Tardis 2000/K9 (the Doctor Who fans will appreciate it!)
> Tardis is an NTP client... gets the time from an NTP service, as well as
> a server, serving the time to other PCs on your LAN. K9 is the
> client-only app which runs on the LAN PCs. Both will run as a service on
> Win2k, tardis has a 1K memory footprint, K9 similar.
>
> There are Linux versions!
>
> http://www.kaska.demon.co.uk/tardis.htm
>
> Disclaimer: I have no association with the writer, distributor or seller
> of the software, simply a long time satisfied customer
>
>
> -- 
> Norm, VK2XCI,
> Mildura, Australia
> The Wintersun City
> QF15bt
> _______________________________________________
> ozaprs mailing list
> ozaprs at marconi.ics.mq.edu.au
> http://marconi.ics.mq.edu.au/cgi-bin/mailman/listinfo/ozaprs
>

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