Analog Atomic Wall Clock With Silent Second Hand No Battery
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| May 19th 2015, 19:35 | |
wd6ejnTotal Topics: 0 Total Posts: 0 |
For many years now I have been trying to find a large (14") atomic wall clock which doesn't use an aa battery. I also don't like the noise (it reminds me of grade school!! come on 3:30) the second hand makes. I would really like one that uses gps to lock as I am not allowed to have antennas in this tiny apartment and wwv is very hard to hear most of the time. To save money it would be fun to find a kit which uses an atomic or gps receiver to correct the time, just a huge clock drive would be enough. I once had a search engine return a company that makes makes atomic street clocks ! with a roman numeral face,,,,I can't believe that I even found this. Is there some reason these are blocked from the web? |
| May 20th 2015, 17:31 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
Atomic clocks use batteries to allow for better reception of the 60 kHz WWVB signal. Harmonics of AC power disrupt WWVB reception. GPS clocks operated inside building typically need external antennas to receive satellites. http://geoffg.net/GPS_Synchronised_Clock.html This project replaces the electronics in a standard quartz wall clock with a circuit that uses GPS satellites to get the precise time. This page also points out that you can buy movements by Citizen and Seiko that have a continuous sweep second hand that is silent. Seiko QXA628KRH Wall Japanese Quartz Wall Clock This clock could be used for either 12 or 24 hour time, as there are markings for hours 13 through 24. But, it does run on an AA battery--perhaps you could redesign it to run on solar power? http://www.masterclock.com/products/clkntd12-24hm.php This company sells a 24hour clock you can plug into to your computer that gets accurate time via Internet servers. No AA batteries and quiet operation with an analog dial. Zack Lau W1VT |
| Jun 9th 2015, 21:34 | |
wd6ejnTotal Topics: 0 Total Posts: 0 |
http://www.masterclock.com/products/clkntd12-24hm.php This company sells a 24hour clock you can plug into to your computer that gets accurate time via Internet servers. No AA batteries and quiet operation with an analog dial. Zack Lau W1VT [/color] I would think there would be too much delay through the internet for any kind of accuracy. I have had plans to have a video game with a non-ham friend on the internet, and I would be on the air possibly using a laser through the space station. He insist that he will win every time and refuses to listen to me how much faster signals through the ether would be. Isn't it just the way it goes we will probably never get around to having this contest, whether to human condition or money. |
| Jun 11th 2015, 14:03 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
http://www.ka7oei.com/oei_gps.html Many hams have used the z3801 as a time/frequency standard. It combines the accuracy of the time standard about satellites with a highly accurate quartz reference on the ground to compensate for propagation issues. The HP quartz oscillators are among the best you can buy. Zack W1VT |
| Jun 11th 2015, 15:55 | |
aa6eTotal Topics: 0 Total Posts: 0 |
Network time sync with computers can be quite good - and cheap. With NTP client software, you can get timing accurate in the msec range without much trouble. It compensates for network delays, and compares against a group of time servers. Further info: http://en.wikipedia.org/wiki/Network_Time_Protocol 73 Martin AA6E |
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