[Elecraft] Clock chip

[Arlen Fletcher]

I’m guilty of starting a thread similar to this one a couple of months back. 

My K3 clock drifts and, being a newbie, I wasn’t certain whether it was within spec or not. I learned that it is within spec - but I wanted something more accurate - not because I NEED it, but because I thought it might be a fun project. 

So I designed and built a GPS clock. It uses a $40 GPS module that has a battery-backed clock chip in it (so it keeps reasonable time when there is no GPS satellite lock). It only needs a single GPS satellite for accurate time. I put it out in my garage because my shack is in the basement and GPS coverage is marginal there. It communicates with the display unit via an XBee Series One radio link, updating the display in my shack (driven by an Arduino Uno) about every 200 milliseconds. Is it overkill? Probably. But I had fun designing it, building it, and writing and debugging the code. I’m a ham… I do things like this because it’s fun - and since I’m not selling it I don’t have to worry too much about how practical it is. It’d be nice if the K3 clock was more accurate - but then I wouldn’t have learned about GPS timekeeping, XBees, and driving an I2C display and GPS unit from an Arduino!  :-)

73

Arlen, AA7F

> On Feb 15, 2015, at 5:19 PM, Richard Gillingham <w1rg at hotmail.com> wrote:
> 
> 
> Here in South Florida, atomic clocks will not sync it all. 73,
> Gil W1RG
> 
> Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone
> 
> <div>-------- Original message --------</div><div>From: Ken G Kopp <kengkopp at gmail.com> </div><div>Date:02/15/2015  1:25 PM  (GMT-05:00) </div><div>To: "Lynn W. Taylor, WB6UUT" <KX3 at coldrockshotbrooms.com> </div><div>Cc: Elecraft Reflector <elecraft at mailman.qth.net>, KX3 at yahoogroups.com </div><div>Subject: Re: [Elecraft] Clock chip </div><div>
> </div>
> Given the tiny size of "atomic clock" /  WWVB devices ... as in wrist
> watches ... it would seem one could be integrated into both the K3 and KX3
> and make the clock actually usable.
> 
> 73
> 
> Ken - K0PP
> On Feb 15, 2015 11:17 AM, "Lynn W. Taylor, WB6UUT" <
> KX3 at coldrockshotbrooms.com> wrote:
> 
>> In which radio?
>> 
>> On 2/15/2015 9:52 AM, Jim Miller wrote:
>> 
>>> Elecraft, Please give us a replacement clock chip that will keep time.  An
>>> adjust method for what we have?
>>> 
>>> 
>>> Thanks, Jim KG0KP
>>> 
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