Jonathan Buzzard wrote:
On Fri, 23 Jun 2006 07:12:29 -0700, Julien wrote:
[SNIP]
2/ can you advise me some middle-range clocks (several hundred euros
max.) working on Linux, as well as pros and cons regarding the
technology (GPS, radio...) ?
[ double snip ]
You could get a couple of radio receivers going for under 100EUR. At the
very least they make a good backup to a GPS receiver.
JAB.
As a user for many years I can vouch for their stability and
performance. They are a good choice for me as I have no access to roof
space. You do not need an open view of the sky as you would for GPS. I
do have some issue with device placement as the 77.5KHz DCF and 60KHz
MSF signals don't pass through the armoured concrete of my appartment
block, but a near window is OK. I haven't tried the HBG source as I
can't find a cheap receiver. Another option is the French TDF source,
which I think is about 20times more powerful than the UK and German ones
and its 162KHz carrier penetrates really well.
Jonathan's designs are powered off the server serial port so there are
no extra power points to provide. Serial cable run for the antenna is a
possible issue. I have no problems with 5 meters, but I dont know how
they would show with 5 times that. Another (for me minor ) issue is
that the transmitters are occasionally powered off for an hour or two
for maintenence and maybe also during electrical storms. Their signal
quality is affected by storms and possibly by interference from other
electrical equipment. GPS doesn't have that problem but you need to have
a view of the sky such that at least one satalite is visble at all times.
I live in France and can receive and use both MSF(Rugby UK) and DCF
(Mainflingen Germany) and get a down to few millisecs offset from UTC.
There are of course commercial equivalents, but at a price.
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