THG TIM 2015, Техническое руководство

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TIM 2015 Technical Manual v1 (February 2018) Page 24
Users attest to the accuracy of TIM 2015. One customer says: “The new clock seems to agree very well with the GPS time received on my
mobile phone, which makes me think it’s accurate.” Our own experience confirms this. The prototype was checked against satellite time
nine months after it was first set up, during which time it had still not been resynchronised at all. It was two seconds behind the correct
time of day. This accuracy says a lot about the stability of the RTC module used in TIM 2015. Two months later the prototype was compared
against the BT speaking clock on a landline telephone; it was still spot-on.
Dave Thorpe, the designer of TIM 2015’s circuitry, comments: “The RTC can be very accurate, it has temperature compensation and the
‘ageing’ setting can be used to fine-tune the accuracy and compensate for the crystal ageing.”
Another person writes: “The time is indeed correct to the moment, too. I happened to call as the minute was changing and “the third stroke”
happened at the same moment that the minute changed on my IP phone, which is synced to my internal NTP server.”
About Unusual Electronics
This is the firm that carried out the design of TIM 2015. You can see other products offered by this ingenious and responsive company, at
http://unusualelectronics.co.uk/ . In particular ‘techies’ may well have a use for the Chronvertor; see
http://unusualelectronics.co.uk/products/chronvertor/ .
The Gallery ( http://unusualelectronics.co.uk/gallery/ ) displays some of their customers’ most ingenious constructions, including a nixie tube
clock built inside an old Avo meter case.
Web links

UK MSF Time service –The website for MSF time broadcast transmitter serving the British Isles.

German DCF77 Time service – The website for the German time broadcast transmitter DCF77 that covers most of Europe.

US NIST Radio Station – Explanation of the protocol used by the North American WWVB time broadcast.

Telecommunications Heritage Group – The organisation that supported and kick-started the funding of the TIM 2015 project.

Unusual Electronics Ltd – Responsible for the technical design of the TIM 2015 project.