One GPS unit broadcasting the time locally is what I do. I use a unit
with an external antenna, so no issues with locking in a signal. The
unit starts searching for a signal every night at midnight, then once it
locks on shuts down the GPS. I use a n accurate RTC the rest of the
time. Saves power (I live off grid) and keeps the time spot-on.
On 7/18/2013 12:33 AM, Nigel Walker wrote:
I like to use GPS, DCF, MSF because then I don't have to set the time
on the clock, it is very accurate and in clock needs fewer buttons.
Disadvantages are:
GPS - The clock location needs to be able to see the GPS satellites,
although these days the receivers are so sensitive you can often make
these work indoors.
MSF/DCF - Can be prone to interference from TV/Computer monitors and
even the switcher in the clock.
These disadvantages can be addressed by having the receiver unit
remote from the clock and then a low power wireless connection between
them, but that is getting a bit complicated. It does mean, if you have
several clocks, you could have one 'server' sending to all the clocks.
Nigel.
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