[time-nuts] Radio Controlled Clocks

[David G. McGaw]

A clock that uses an NMEA stream for its display will be a few hundred 
milliseconds slow, dependent on the chosen data products and serial baud 
rate, as NMEA gives the time of the previous second mark.

David N1HAC

On 12/27/20 9:54 AM, Andy Talbot wrote:
> I've just had a look around the house, and actually have four MSF clocks
> and an old wristwatch minus its strap (antenna is a small ferrite rod
> inside).  Forgot I had an old Junghans one as well - that is sitting out in
> the shed as it requires a stronger signal than the more modern ones, and
> seems to get better reception out there.   It's the only one that shows MSF
> outages as it updates every hour - and the battery seems to last forever!
>   I never checked to see how close that is to GPS;  if they implement proper
> timing or just a simple delay bodge.
>
> Andy
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>
>
> On Sun, 27 Dec 2020 at 14:02, Peter Vince <petervince1952 at gmail.com> wrote:
>
>> Hello Andy,
>>
>>       I have an old Maplin digital LCD clock for MSF, and that is always
>> about a second slow, but the Coopers analogue clocks are MUCH closer, as is
>> the Junghens DCF digital LCD clock.  But the Junghens DCF clock always
>> misses one or other of the DST changes!
>>
>>       Peter
>>
>>
>> On Sun, 27 Dec 2020 at 12:11, Andy Talbot <andy.g4jnt at gmail.com> wrote:
>>> With this talk of Radio Controlled clocks...
>>> I have three domestic RC clocks here, receiving the UK 60kHz signal, MSF.
>>>    However, I notice that when compared against a GPS clock, timed from
>> the
>>> 1 PPS signal & NMEA output, they all are a few hundred milliseconds fast,
>>> ie the display changes just before the GPS derived time.
>> ...
>> ...
>>> I only ever have digital display clocks, so wouldn't know if the same
>>> happens with round ones with hands.    Anyone else using domestic MSF or
>>> DCF77 clocks who have observed this?
>>>
>>> Andy
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