[time-nuts] Reference oscillator accuracy

[Don Latham]

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" <time-nuts at kasperkp.dk>
To: <time-nuts at febo.com>
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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