-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 23 Dec 2009 at 21:03, Johan Kiviniemi wrote:
> Hi timekeepers, > > If someone were to determine inexpensive GPS and radio clock receivers > (and perhaps also an OCXO) of decent quality, I wonder how many > Europeans would be interested of participating in a bulk order? > > It might be useful to have e.g. both DCF77 and MSF60 receivers as > fallbacks for GPS time. These three time sources could be connected to > two serial ports. (Port 0: RxD for GPS data, DCD for PPS[0]; port 1: > DCD and CTS for the two radio clocks[1]). > > An example GPS receiver (of unknown quality) with a PPS output: [2] I'd give one of those a try if I could find a UK stockist. Importing from US would probably push price up to about same as the Garmin GPS-18x_LVC I have which gives around 1us offset when given a full view of sky but doesn't work at all where I'd need it near my server. DCF77 from Frankfurt is also difficult to receive from my location which is around 1000km distant and suffers from skywave? interference for a couple of hours most days, otherwise offset of about 1ms is obtained. MSF from Anthorn which is only about 160km distant is also a problem for reception with variation in signal and interference, but with a frame aerial, again remote from servers, was giving offset < 200us, and now with ferrite rod aerial and located near enough to server for a short cable run is only within 1ms, but that is my stratum 1 server. Receiver is a ukp 12 Conrad DCF77 module with xtal and aerial swapped for 60kHz. My intention is to eventually mount receivers on a mast at roof height which involves a 20m or so cable run. David > > It would be nice to get enough people to order to drive the price > down. It would also be nice to find someone with the expertise to > determine an optimal set of components for this. (Someone should also > organize the whole ordeal.) > > And obviously it would be fun to run your own stratum 1 server. :-) > > [0]: > http://wiki.enneenne.com/index.php/LinuxPPS_NTPD_support#Installation_ > 2 [1]: http://www.buzzard.me.uk/jonathan/radioclock.html [2]: > http://www.sparkfun.com/commerce/product_info.php?products_id=9133 > - -- David Lord <[email protected]> <ftp://ftp.lordynet.org/pub/pgpkeys/lg_david.pkr> <http://www.lordynet.org/pub/pgpkeys/lg_david.pkr> -----BEGIN PGP SIGNATURE----- Version: PGP 7.0.4 -- QDPGP 2.65 Comment: http://community.wow.net/grt/qdpgp.html iQA/AwUBSzLkja2RmIodDo7KEQITLACfR7MjeGH5ZgcRpm/umIZDj0GDD9kAoN7y A678JOgbjyXmqI4qOi+ECg1s =qBUP -----END PGP SIGNATURE----- _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
