Me and @Lepdiggums have been discussing the C02X Aqualand (or Depth Meter in Japan) in recent months, gathering info from the web and from old catalogs. I will use this thread to share this info, as there is some incorrect information floating around t…
Continue readingPoll: should I stay or should I go now? You guys decide.
I don’t point out misconceptions about HAQ as part of some diabolical plan to make people lose face. I point them out so that the forum as a collective can come to a better shared understanding. But it seems my efforts are unappreciated. So I will hold a vote, so all the lurkers can speak their mind. Should I stay or should I go?
Continue readingConsidering the views in this forum, I will consider less than 50 total votes as a majority vote for option 4, which will have the same outcome as a majority vote…
On the origins of short-cycle logical regulation aka digital count adjustment
For a long time, members of this forum thought inhibition was the only feasible method for ‘modern’ (ie single crystal 32 kHz) HAQ. Some members, like Catalin, suspected alternatives based on technical manuals, but the specifics remained vague. Thanks to (Japanese) sources I have found and shared, we now know many of the specifics, not only about early analog TC, but also alternative methods to inhibition, like time-division capacitor switching. Most general info comes from a…
Continue readingOn the origins of short-cycle logical regulation aka digital count adjustment
The Vintage Citizen Thread aka Show off your vintage Citizen (pre-1990)
I want to create a central thread for discussing vintage Citizens and showing off your vintage Citizen, hence the title 😉
Continue readingLet’s be very inclusive and define vintage as roughly pre-1990.
To kick it off, here is a pretty extensive article on the history of Citizen: history14-27 (watchtime.com)
To learn more about vintage Citizens, there are two essential websites…
The Vintage Citizen Thread aka Show off your vintage Citizen (pre-1990)
Dual oscillator HAQ movements and methods
Seiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock)
As I discussed in below quote, Seiko has patented a new HAQ method with dual oscillators (likely based on an older Citizen method for which the patent has expired).
Continue readingSeiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock)
