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Continue readingWhat is heritage?
“Moser has passed”
Continue readingNo, this is not about 22-year old Moser Schaffhausen AG, which styles itself ‘H. Moser & Cie.’ after the 19th century watchmaker.
Thomas F. Moser died about two weeks ago, self-taught maker of chairs for presidents and popes, founder of Thos. Moser Furniture, author. (Non-paywalled…
The heritage of quartz watches
This late 80s Motorola ad shows a U.S. Army SCR-536 ‘Handie Talkie’. It was indeed the ancestor to today’s mobile phones, entering wartime duty around 1941 with a short range of around a mile.
Less photogenically but even more important to the war effort, Motorola made a longer-range unit for the company level, the backpack-like SCR-300-A ‘Walkie Talkie’:
(as well as vehicle-mounted…
Geneaology of HAQ movements
There have been three major approaches to improving quartz accuracy:
1) use a thermally insensitive XO
2) control the frequency of the XO by varying the capacitance of the oscillator circuit
3) arrange the circuit to divide the frequency of the XO by a…
What are the unanswered questions in HAQ?
What are your unanswered questions regarding HAQ watches?
Some of mine are:
1. Is 9F regulatable wirelessly?
2. What 9F regulating equipment is available in the main GS overseas service centers such as Mahwah NJ and Singapore?
3. What is the aging …
Continue readingGPS clock with OCXO and timestamping
Following my ‘starter’ GPS clock, I have acquired another from the same makers:
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My cost: under $300.
This version foregoes any display but adds an oven controlled quartz oscillator (OCXO). This keeps the XO within a tight temperature band in order to stabilize its rate, both when the clock is autonomous and for the more usual application of correctly subdividing the 1 pulse/second…
OCXO timekeeping
An oven-controlled crystal oscillator (OCXO) is said to be chronometrically superior to a thermocompensated XO (TCXO) such as those we have in our HAQ watches.
I gather it is because the ‘oven’ maintains the XO in its turnover temperature, where the T…
Continue reading(Towards a) Seiko TC history to 2022
Old Citizen Technical Manual
Attached is a Citizen Technical Manual obtained from the Cousins UK web site, if memory serves.
My best guess at the date is 1985, from the last page:
…
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