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I doubt if 1s pulses could be extracted from those. The reason they are so cheap is that all the electronics is on one custom chip driving the LCD, with no extra connections accessible.

Exactly the same argument applies to some handheld GPS receivers, the 1pps output is availalbe from the more expensive OEM modules such as the GPS25, but not from the £60 hand held devices.

However, MSF clock receiver kits used to be availabe from some of the kit suppliers. That would be a better route to getting UTC pulses. They will only be accurate to a few milliseconds though as the delay through tuned circuits and IF filters, as well as the flight time from Rugby, cannot be taken into account in the same way as GPS can.

Also, if you have a decent ovenned crystal oscillator capable of even 0.1ppm, that will give a quite accurate clock, good for a about 3 seconds per year. Most TCXOs can probably manage that sort of accuracy if kept indoors at a reasonably constant temperature.

Andy G4JNT

-----Original Message-----
From: Laurie Mayhead [mailto:laurie@g3aqc.freeserve.co.uk]
Sent: 2001-03-21 11:51
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re. Lf DFCW

Hello All,

Rik in a recent posting mentioned the timing inaccuracies of PC clock cards.Now I may be getting out of my depth here!but MSF Rugby puts out a time signal accurate to 1pt in a million,with long term correction to take care of drift.Surely other countries have similar systems(WWV for example.So why cant we use a cheap clock module £20 in the UK extract 1sec pulses to sync our QRSS and ARGO systems? Is this too naive?. I would like eventually to be able to use the equivalent of 10secs dots in order to make DX contacts a more realistic possibility. 73s Laurie.





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