[time-nuts] Time nut newbie

Bob Camp lists at rtty.us
Tue Apr 30 20:26:30 UTC 2013


Hi

Either I need a new calculator or a new set of eyes....

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bruce Griffiths
Sent: Tuesday, April 30, 2013 3:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Time nut newbie

12 days is 1024800 s ie just over 1 million seconds so a frequency 
offset of 0.1ppm results in a time error of ~ 0.1s not 1s.
1sec error would occur in just under 116 days,

Bruce

Bob Camp wrote:
> Hi
>
> If you take a look down in the fine print on the OCXO spec, the aging rate
> is 100 ppb / year in the first year. If you are off by 0.1 ppm (100 ppb)
> your clock will gain a second in less than 12 days.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Tim Bastian
> Sent: Tuesday, April 30, 2013 1:50 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Time nut newbie
>
> Hi all,
>
> I'm a time nut newbie. My obsession started with the search for an
accurate
> chronometer to carry on my boat for celestial navigation. Yes there still
> are a few of us left that practice the art.
>
> My current project is a quartz chronometer using a DS32Khz tcxo oscillator
> and two 74HC4060s (+ or- 10 seconds / year).
>
> For my next project I'm looking at an Abricon Part Number AOCJY2-10.000MHZ
> ocxo 5 ppb running through a pic and using the algorithm posted on
> http://www.romanblack.com/one_sec.htm. I'm shooting for + or - 1 seconds /
> year.
>
>   Is there an archive of old posts that might be helpful in answering some
of
> my questions and for getting ideas.
>
> Thanks,
>
>    Tim KK4FQB
>
> Sent from my Motorola ATRIXT 4G on AT&T
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