[time-nuts] Radio Controlled Clocks

[Andy Talbot]

Update.
The Junghans Mega is approx 100ms late updating its display.  And it's
pretty cold, sitting in the outside shed so the LCD is a bit sluggish. It
looks like the designers of that tried to do the job properly.

Andy
www.g4jnt.com



On Sun, 27 Dec 2020 at 14:54, Andy Talbot <andy.g4jnt at gmail.com> 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
> www.g4jnt.com
>
>
>
> 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
>> > www.g4jnt.com
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>