I think this is what you want, but unfortunately, I don't know the price:

https://timetoolsltd.com/products/synchronized-network-clocks/analog-poe-ntp-ip-clock/

Rick

Sent from ProtonMail, Swiss-based encrypted email.

------- Original Message -------
On Tuesday, December 13th, 2022 at 2:09 PM, Bob Camp via time-nuts time-nuts@lists.febo.com wrote:

Hi Bob,

Seiko Corporation has produced a range of GPS receiving clocks under its “Space Link” name for several years. They have also a produced a range of GPS synchronised quartz wristwatches under their “Astron” name for more than ten years.

See www.seiko-clock.co.jp/product-personal/wall_clock/satellite/

And Silicon Chip Magazine, a fantastic Australian electronics hobby magazine, has published several GPS time projects over the past 7 years or so. Their most recent project in September details modifying a regular quartz clock to use a GPS receiver. You can find a preview of that project and purchase a kit of the parts at:

www.siliconchip.com.au/Issue/2022/September/New+GPS-Synchronised+Analog+Clock

Hope these help you find what you’re looking for.

Roger.

I have a GPS 'synced' analog clock.  I'm using an old synchronous
motor clock and driving it with 90vac generated by an old synthesizer
clocked off my house 10MHz feeding a bipolar amplifier.  I think this
is essentially the same setup as TVB mentions at
http://leapsecond.com/pages/atomic-nixie/

Here's the clock in my home office:

https://nt4tn.net/clock/clock.jpg

Here is the equipment on the other side of the wall supporting it.

https://nt4tn.net/clock/equipment.jpg

Of course, it only sets the frequency frequency not time... but you
can just set the time of the clock via mk1 eyeball to whatever
precision you like and once its set it keeps time.

I've also had fun running the clock on mars time when the rovers were
the current thing and (more often) sidereal time for astronomy.

I'm not sure I'd recommend this approach in that it draws a lot of
power and ties up otherwise more flexible equipment (and noisy).  I
put it into place expecting to replace it with some dedicated 'fake
mains'  (like... running a wall wart transformer in reverse from a
dedicated little synthesizer and an audio amplifier) but have never
gotten around to it.  The power usage is an actual issue too since it
gets in the way of providing long lasting backup power.

One great thing about using synchronous motor clocks and a fake mains
is that you could easily support a bunch of clock this way and there
are many interesting synchronous motor clocks that exist.

On Thu, Dec 15, 2022 at 5:10 AM Bob Camp via time-nuts
time-nuts@lists.febo.com wrote:

Relatively easy DIY project.  Most battery operated wall clock movements are driven
by a two phase motor - positive pulse followed by negative pulse.  Many GPS modules
provide a single phase pps output.  The problem is to generate the bi phase from the
single phase pps.  I have a Brooks Shere system running that has a 'heart beat' signal
available (one second on, one second off).  If that signal is applied thru a series capacitor
(about 47-100 microF) it will be differentiated to provide the bi phase pulses.
Remove the battery from the clock.  Locate the motor winding and apply the bi phase signal.
I have had a couple of wall clocks driven by GPS for years.  It only missis a beat if the GPS goes down.

Alternate solution is to use a micro processor on a chip (about $2.50) to generate bi phase
from pps.  That takes about 4-6 lines of program, depending on the chip.

Regards.
Bill, NL7F

On Tue, 13 Dec 2022 15:09:26 -0500, Bob Camp via time-nuts wrote:

Bill Beam
NL7F

Bob-

They don't hang on the wall or have mechanical movements but...
Here's one of my favorite semi analog clocks I have.
http://badnixie.com/Black_Emerald_Nixie.html

I have two modsix clocks running off the same GPS receiver wirelessly.  It
outputs 4/6 letter WORD generator, selectable Time Sync out,  integrated
GPS, Barometric Pressure, Humidity, Temp , and real  GPS coordinates.

You can see them in one of my YouTube videos below.  It's the two with
alphanumeric Nixie tubes the B-7971 and B-8971 tubes from Boroughs.  I
consider them pretty analog as pure analog GPS receiver isn't something I'm
sure anyone has tried to build ie. no integrated circuits.  If someone has
I'd love to see it:

https://youtu.be/_p3gDBU524A

I consider these pretty analog and nuts.  170V and you're good to go plus I
love neon plasma too!

Best Regards,

Bill

On Wed, Dec 14, 2022, 10:11 PM Bob Camp via time-nuts <
time-nuts@lists.febo.com> wrote:

On Thu, Dec 15, 2022 at 5:09 AM Bob Camp via time-nuts <
time-nuts@lists.febo.com> wrote:

The only thing I can see a need to feed-back is the local time offset,
possibly including daylight savings time. So I think I'd use a conventional
crystal-based clock mechanism but replace the crystal with a 32768Hz source
locked to a GPS module in the same way as a GPSDO. It would also need a
reasonably good holdover oscillator as, assuming you want a self-contained
clock, the GPS signal indoors (once considered impossible) may be
inadequate in some locations.

So the time display would be completely under your control, but the tick
rate would be as accurate as you can get.

Hi

Indeed that gets me part of the way there. It at least moves the task from building a
clock over to feeding an existing gizmo the type of time I want to see.

What I want to display is actually the time that GPS runs on. The formal name appears
to be GPS System TIme. UTC without leap seconds is another common way of talking
about it.

Since you are off from the “rest of the world” by some number of seconds, you can’t just
sync up to a typical source and move on. Somehow you need to deal with the (variable
over long time spans) offset between GPSST and UTC.

The “why?” behind this is that I’m in the middle of a bunch of GPS based file this and
that. They all sync up to GPSST. Checking on them to see that all is well involves
working out when they should have done this or that. Having a clock to look at should
make that easier.

Bob

1PPS into a toggle flip-flop such as a 74AC74 w/ feedback (AC has strong
output drive, can run off 2V to 5.5V) followed by a differentiator
(could be just an appropriate capacitor) could generate the bipolar
pulses for a standard battery clock movement.

David N1HAC

On 12/15/22 2:59 AM, Bill Beam via time-nuts wrote:

Hello to the group.
Interesting subject. There is another approach to this and I and Rodger are
working it.
Thats to reuse broadcast television clocks like Evertz. They make wall
clocks, rackmount versions all driven by LTC timecode. These can be had on
ebay at times for reasonable cost.
How to drive these. The normal way is a gps locked broadcast generator.
However in progress and working is an Arduino gps locked LTC generator.
Uses a cheap ublox GPS receiver and arduino and literally 2-3 cmos chips
74HC series.
OK that nasty soldering iron.
But it is working well. Still reworking some of the code.
Though I have the magical broadcast generator it consumes 30 watts and
given the power cost in New England now the arduino solution is .5 watts
all in.
I will share with timenuts all of the details when ready.
Not expecting this to take long but ordered a LEA-6T from China should be
here any week/day now. Its better than the NEO-6. The LEA has an advantage
it can generate a very good 2 KHz. Eliminating a stable 2 KHz osc in the
solution today.
This uses some code from the open LTC generator. That arduino code has some
very serious issues that are eliminated by the few chips added to build a
proper LTC encoder.
Regards
Paul
WB8TSL

On Thu, Dec 15, 2022 at 9:53 AM Bill Notfaded via time-nuts <
time-nuts@lists.febo.com> wrote: