[ntp:questions] Re: CHU time source?
Steve Kostecke
kostecke at ntp.isc.org
Thu Dec 30 18:33:14 UTC 2004
On 2004-12-30, David Magda <dmagda+trace040726 at ee.ryerson.ca> wrote:
> Reading a bit about CHU service offered by the NRC up here in Canada
> and NTP.
>
> I borrowed a Sun Sparc 5 (Solaris 8) in relation to other work I'm
> testing, and was curious whether it's as simple as plugging in a
> shortwave radio into the microphone jack and telling NTP (4?) about
> it with 'driver 7' (127.127.7.x).
And you'll need a few symlinks in /dev
# For audio input:
ln -s /dev/audio /dev/chu_audio
# For serial control of your ICOM (or TenTec RX-320) radio:
ln -s /dev/ttyS0 /dev/icomx # where x is from 127.127.7.x
The error messages in the log will help you see what you need.
> Has anyone used CHU?
I am on a Pentium90 (24MB) laptop with a TenTec RX-320 radio. I'm using
Tim Shoppa's modified icom.{c|h} files to allow ntpd to control my
radio.
These stats are not as good as they might be because I have the serial
control link for the radio temporarily disconnected.
remote refid st t when poll reach delay offset jitter
========================================================================
*CHU_AUDIO(0) .CHU1. 0 l 115 64 377 0.000 0.229 0.321
ntpdc -c kerninfo
pll offset: -0.000205 s
pll frequency: 87.072 ppm
maximum error: 0.019299 s
estimated error: 0.00024 s
status: 0001 pll
pll time constant: 2
precision: 1e-06 s
frequency tolerance: 512 ppm
pps frequency: 0.000 ppm
pps stability: 512.000 ppm
pps jitter: 0.0002 s
calibration interval: 4 s
calibration cycles: 0
jitter exceeded: 0
stability exceeded: 0
calibration errors: 0
ntpdc -c sysinfo
system peer: CHU_AUDIO(0)
system peer mode: client
leap indicator: 00
stratum: 1
precision: -18
root distance: 0.00000 s
root dispersion: 0.00250 s
reference ID: [CHU0]
reference time: c57ec79c.704b3c3e Thu, Dec 30 2004 13:29:48.438
system flags: auth monitor ntp kernel stats
jitter: 0.000198 s
stability: 0.000 ppm
broadcastdelay: 0.003998 s
authdelay: 0.000000 s
--
Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/
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