|
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
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.
--
The Information contained in this E-Mail and any subsequent correspondence
is private and is intended solely for the intended recipient(s).
For those other than the recipient any disclosure, copying, distribution,
or any action taken or omitted to be taken in reliance on such information is
prohibited and may be unlawful.
| 