[ntp:questions] Re: questions on msf (via shm) clock
michael.no.spam.cook at wanadoo.fr
Wed Dec 29 23:47:51 UTC 2004
dave morgan wrote:
> after a couple of false starts (transistor back to front,
> resistor connected to wrong pins :-/ ) I have got my MSF refclock
> working. This has raised the following questions -
> a) will its jitter figure never go below 1?
you may be able to get better a bit better. I have a homemade
DCF refclock that get around 1 aswell. For the $15 it cost to make
I consider it OK.
remote refid st t when poll reach delay offset jitter
127.127.1.0 LOCAL(0) 10 l 32 64 377 0.000 0.000 0.001
*127.127.28.0 .DCF. 0 l 34 64 377 0.000 -3.387 1.115
> b) why does the refid for this clock show SHM(0), even though the
> lines for it in the ntp.conf file is as follows?
> #msf rx on serial port 1
> server 127.127.28.0 prefer
.0 is shm(0) .1 (1) etc
> fudge 127.127.28.0 stratum 2 time1 0.022 refid MSF
> c) what stratum should I declare it? I have left it fudged to 2 for
> now as the jitter seems no better than the other stratum 2 servers
> I use.
As it is a reference , I leave mine at the default of 0 . The stratum
is just how may steps you are away from from the reference, it doesn't
directly relate to the accuracy or stability as far as I am aware.
$ ntptrace stratum1.d2g.com
stratum1.d2g.com: stratum 1, offset -0.003002, root distance 0.000000,
> best regards
> Dave Morgan
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