li...@lazygranch.com said:
A bit OT, but back in the day there was what amounted to an X-prize for a
real accurate chronometer for navigation.
Make that way back in the day. http://en.m.wikipedia.org/wiki/John_Harrison
There is a good book out on that topic:
Longitude by Dava Sobel
On Tue, Apr 30, 2013 at 7:40 PM, Jim Palfreyman jim77...@gmail.com wrote:
Buy a cheap rubidium off ebay and use it to drive a micro-controller and
write some clock software.
That was exactly my solution but I'm waiting ti hear about his size,
power and cost budget. If this has to run on
On Tue, 30 Apr 2013 13:49:43 -0400
Tim Bastiann7...@yahoo.com wrote:
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
Hi
It was tired old eyes and tiny numbers on the calculator ….That plus to much
distraction to double check things.
Bob
On Apr 30, 2013, at 9:57 PM, Rex r...@sonic.net wrote:
It doesn't affect the general magnitude conclusions by Bruce, but as long as
we are making corrections, my
.
Best regardsMark S
Message: 7
Date: Wed, 1 May 2013 09:45:06 +0200
From: Attila Kinali att...@kinali.ch
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Time nut newbie
Message-ID: 20130501094506.966146722efbbaf9c80e5...@kinali.ch
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
Hi Tim --
Welcome! The easiest way to search the time-nuts list is to use Google
and add the site:febo.com tag -- that will bring up hits in the list
archive (as well as anything on my web site that might be pertinent).
John
On 4/30/2013 1:49 PM, Tim Bastian wrote:
Hi all,
I'm a
n7...@yahoo.com said:
My current project is a quartz chronometer using a DS32Khz tcxo oscillator
and two 74HC4060s (+ or- 10 seconds / year).
How do you get 10 seconds per year? The data sheet says 1 minute per year.
--
These are my opinions. I hate spam.
...@febo.com] On
Behalf Of Tim Bastian
Sent: Tuesday, April 30, 2013 1:50 PM
To: time-nuts@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
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.
Do you have some power or size limitation? If not you can do a
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
: [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
Hi Tim:
You might look into the DS3232 which can be combined with a PIC to control the
aging rate register.
http://www.maximintegrated.com/datasheet/index.mvp/id/4984
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Tim Bastian wrote:
Hi all,
...@yahoo.com
Sender: time-nuts-boun...@febo.com
Date: Tue, 30 Apr 2013 13:49:43
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Time nut newbie
Hi all,
I'm a time nut newbie. My obsession started with the search
On 4/30/13 4:18 PM, li...@lazygranch.com wrote:
A bit OT, but back in the day there was what amounted to an X-prize for a real
accurate chronometer for navigation.
Make that way back in the day.
http://en.m.wikipedia.org/wiki/John_Harrison
And he had a heck of a time collecting. I suspect
It doesn't affect the general magnitude conclusions by Bruce, but as
long as we are making corrections, my calculator seems to think
60 * 60 * 24 * 12 = 1036800 seconds in 12 days, not 1024800. That does
come out to 115.7 days for 1 sec error. Maybe the 12-day number was a typo?
-Rex
On
Buy a cheap rubidium off ebay and use it to drive a micro-controller and
write some clock software.
On 1 May 2013 11:57, Rex r...@sonic.net wrote:
It doesn't affect the general magnitude conclusions by Bruce, but as long
as we are making corrections, my calculator seems to think
60 * 60 * 24
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