camrok
Needs a Life!
Posts: 2,419 
|
Post by camrok on Feb 21, 2017 23:52:09 GMT -8
Citizen, Casio and possibly Seiko use time servers on some of their watches.
I have not read into this at all, so forgive my ignorance. 3 questions:
1-Is it correct they use a low frequency radio wave (MHz)?
2-multiple manufacturers use the same servers to transmit UTC?
3- if that is correct does that mean it would be relatively inexpensive to set up a server and potentially benefit thousands of people in lands that time forgot... such as Australia, South Africa and India to name a few?
|
|
Mr.Jones
Needs a Life!
Hamburg, Germany
Posts: 4,679
|
Post by Mr.Jones on Feb 22, 2017 1:16:02 GMT -8
Ummm. I think they receive the atomic time on specific frequencies that are standardized around the world (that's the "X bands" on the dial). Usually that's Japan, USA and Germany. The newer calibers also receive from China. 1) They transmit somewhere between 40 and 80 kHz. 2) There are "Time Servers" in different countries which transmit on different frequencies. All radio wave watch technology relies on these few Institutions. 3) Running an atomic clock is absolutely possible even for an "amateur", but I think the government would not want you to broadcast a signal to all of Australia, Mark  Check with your Government why Australia does not have an atomic radio time service.  From your National Measurement Service: "Unfortunately, Australia is geographically beyond the range where any of these radio time signals can be reliably received. Furthermore, there is currently no equivalent time signal broadcast in Australia, and no plans for one to be established in the foreseeable future. Radio clocks and watches brought into Australia from overseas suppliers should generally operate satisfactorily as free running quartz clocks. Since no synchronising radio time signal is available, they will display no accuracy advantage over quartz clocks and watches of equivalent quality available locally" www.measurement.gov.au/Services/Pages/RadioClocksinAustralia.aspxFind some more information about radio time sync and Seiko's radio wave caliber 8B92 here: www.seikowatches.com/support/ib/pdf/SEIKO_8B92_E.pdf |
|
camrok
Needs a Life!
Posts: 2,419
|
Post by camrok on Feb 22, 2017 3:50:58 GMT -8
|
|
Mr.Jones
Needs a Life!
Hamburg, Germany
Posts: 4,679
|
Post by Mr.Jones on Feb 22, 2017 10:28:01 GMT -8
That's quite crafty! Obviously this is only an in-house solution, but nicely done.
|
|
camrok
Needs a Life!
Posts: 2,419
|
Post by camrok on Feb 22, 2017 15:28:56 GMT -8
News flash: there are JJY emulators for your phone. Just search JJY emulator!
I emailed the guy who wrote that jr computing page. He wrote the emulator 10 yrs ago. Now he has some low powered transmitter and an aerial in his ceiling. That's commitment!
He also told me about the app emulators.
|
|
camrok
Needs a Life!
Posts: 2,419
|
Post by camrok on Feb 22, 2017 15:30:30 GMT -8
News flash: there are JJY emulators for your phone. Just search JJY emulator! I emailed the guy who wrote that jr computing page. He wrote the emulator 10 yrs ago. Now he has some low powered transmitter and an aerial in his ceiling. That's commitment! He also told me about the app emulators. |
|
Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
|
Post by Adrian-VTA on Feb 22, 2017 16:33:18 GMT -8
A guy I speak to once a year or so is making one of these that plugs into USB and gets it's data from the innernets. |
|
Check with your Government why Australia does not have an atomic radio time service. 
