[time-nuts] Re: Crazy Clock

[Bob Camp]

Hi

One advantage of going straight from a GPS module to the clock is that
the setup should run through the next leap second with no operator intervention. 
Having a setup that simply offsets UTC by X seconds and then feeds that 
to the clock gets you into updates. 

Since this is an “eyeball” measurement, anything better than milliseconds is plenty
good enough. My tired old eyes can’t detect a clock tick that is off by even 10’s 
of milliseconds. Not a lot of need for sawtooth correction or fancy pps stuff. 

Yes, this is a very different sort of clock and time requirement than most of what
we chat about. Running a clock at the “wrong time” will be interesting. Noticing 
that it’s 18 or so seconds off should be pretty easy to do. 

Bob

> On Dec 15, 2022, at 10:15 AM, paul swed via time-nuts <time-nuts at lists.febo.com> 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 at lists.febo.com> wrote:
> 
>> 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 at lists.febo.com> wrote:
>> 
>>> Hi
>>> 
>>> I realize that this is a bit of an odd project, but this is Time Nuts …..
>>> 
>>> I want a analog wall clock that reads out GPS time. As far as I can tell,
>>> nobody
>>> is crazy enough to make one and sell it in the open market. If indeed
>>> there is
>>> one out there, that would be great. This does not have to be a project.
>>> 
>>> If it is a project, I’m lazy, I don’t want to set the thing and then
>> count
>>> on it never
>>> missing a beat. I want a movement that has some form of feedback. The
>>> WWVB clocks have a movement like this. I could tear one apart and try to
>>> reverse engineer the guts. That sounds like. a project inside a project.
>>> 
>>> Does anybody sell feedback movements like this in the hobby market? If so
>>> has
>>> anybody used one and can vouch for it working for more than a few months?
>>> 
>>> Indeed, doing it with a display of some sort would be easier in some
>>> respects.
>>> For now at least, I’m looking for a mechanical gizmo with hands that
>> move.
>>> If it reads out 12 hour time that’s ok. 24 hour time would be super cool,
>>> but
>>> it’s not vital.
>>> 
>>> Anybody know of a source?
>>> 
>>> Thanks!
>>> 
>>> Bob
>>> 
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