Thanks, Didier. I've uploaded "diurnaltot.jpg". It is not fancy, but is
readable.
Anyone interested in on-or off-line csn email me. Seems as if the demise of
loran will kill this, unless groundwave from wwvb at 60 khz is of interest.
Don Latham
----- Original Message -----
From: "Didier Juges" <[email protected]>
To: "Time-Nuts" <[email protected]>
Sent: Friday, November 13, 2009 3:51 PM
Subject: Re: [time-nuts] Reference oscillator accuracy
Don, you are welcome to upload your pictures (and paper) to my web site,
where people normally upload manuals.
Didier KO4BB
http://www.ko4bb.com/cgi-bin/manuals.pl
------------------------ Sent from my BlackBerry Wireless thingy while I
do other things...
-----Original Message-----
From: "Don Latham" <[email protected]>
Date: Fri, 13 Nov 2009 15:01:47
To: Discussion of precise time and frequency
measurement<[email protected]>
Subject: Re: [time-nuts] Reference oscillator accuracy
Hi All: I've copied my paper "Diurnal frequency variation and refractive
index" from Nature Physical Sciences, Vol. 234, 51, pp. 157-158, Dec. 20,
1971. There are two TIFF files (I tried like heck to get them in one file,
and failed miserably, cannot understand my image software worth a #$%^.
The
way to calculate the refractive index of moist air is given. I don't know
how to post these images to the list, so help please. There was no reason
to
pursue the idea at the time, so maybe with the extensive network of the
time-nuts some sense can be made of the idea. Dunno.
Don Latham
----- Original Message -----
From: "Kasper Pedersen" <[email protected]>
To: <[email protected]>
Sent: Friday, November 13, 2009 11:32 AM
Subject: Re: [time-nuts] Reference oscillator accuracy
On 11/13/2009 07:15 PM, Don Latham wrote:
The ground wave path of WWVB varies due to a very small changes in the
index of refraction (temperature and absolute humidity) over the path.
It
is not much, but is measurable.
Don
My own nuttiness started with that, and the innocent question "How much?
What does it take to measure it? What do I need to build?"
http://n1.taur.dk/dcf/ (raw data and plots, time is UTC+1)
I am no more than 6-700 km north of DCF77, and get ~5us p-p. Now that is
quite large, when I started out that number seemed a lot smaller.
/Kasper Pedersen
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