[ntp:questions] Re: Reference clocks - which?

Richard B. Gilbert rgilbert88 at comcast.net
Fri Oct 29 19:18:37 UTC 2004

Marcin Okraszewski wrote:

>I need a cheap reference clock. I don't need a second to be
>really one second, but if it is let say 0.999s I want it to be
>always like this. It would discipline a server clock and in such
>manner I would have a server in my network unsynchronized to
>other sources (the network is isolated), but with stable time
>flow, which I require.
>Can you recommend some *cheap* reference clocks for such
>configuration. PPS seams to be the simplest and possibly cheap,
>but I might be wrong.
>Thank you for help.
>Marcin Okraszewski
>"Ptaki", "Psychoza" i inne filmy Hitchcocka w kolekcji - już na DVD!
>Filmy Mistrza Suspensu za wyjątkowo niską cenę -
>wydane pojedynczo albo w dwóch kolekcjonerskich zestawach.
A cheap reference clock is almost a contradiction in terms!  The least 
expensive I know of might be Jonathan Buzzard's "Radio Clock".  It's low 
in price because you have to build it yourself from components.  
See http://www.buzzard.org.uk/jonathan/radioclock.html or numerous 
references on this newsgroup.

A Motorola Oncore M12+T GPS receiver is available from Synergy Systems 
for around $200US.  This is far better than what you say you need.  It 
requires that you be able site an antenna where it will have an 
unobstructed view of the sky.

Various pieces of used equipment are frequently available on e-Bay.

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