[Elecraft] OT: 24 HR stand-alone shack clocks

[David Anderson]

For decades I used a homebuilt LED shack clock using a GI clock chip 
AY5-1224. It used the mains frequency for time keeping so the long term accuracy was good.

Recently it became faulty and I could not get a replacement chip, so I decided to build something similar but more modern.

(I do have a clock that is synchronised to 60KHz MSF but it is local time only, not UTC).

I wanted something that would just give me auto setting, choice of UTC or Local time with auto DST.

A bit of overkill for a 4 digit shack clock, but I used an Arduino, a GPS module, and an IR controller to switch modes etc.

I did try it without the GPS conditioning but the RTC I had was very poor and even with calibration routines was less accurate than my old mains frequency clock, so I went for GPS which gave me auto setting as well.

Nobody in their right mind would probably want to duplicate it, but anyway I put the details on:

http://sourceforge.net/projects/arduinoledgpsclock/

Still to put it all in a box, but it works great.

Full disclosure: I am a time nut! ;-)

73

David Anderson GM4JJJ 

> On 27 Nov 2014, at 00:25, Bob <WB4SON at gmail.com> wrote:
> 
> I built my own 24 hr dual zone station clock.  It uses a WiFi link to keep
> synchronized time.  Never have to set it and always accurate.
> 
> Details:   http://wb4son.com/wpblog/?page_id=716
> 
> 73, Bib, WB4SON
> 
> 
> 
> 
>> On Wednesday, November 26, 2014, Ken G Kopp <kengkopp at gmail.com> wrote:
>> 
>> I have a couple of JAMECO kit 24 HR clocks with 1" 7-segment red display.
>> They aren't WWVB-synched.
>> 
>> 73
>> 
>> Ken Kopp - K0PP
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