[time-nuts] Reference oscillator accuracy

[Don Latham]

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" <didier at cox.net>
To: "Time-Nuts" <time-nuts at febo.com>
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" <djl at montana.com>
> Date: Fri, 13 Nov 2009 15:01:47
> To: Discussion of precise time and frequency 
> measurement<time-nuts at febo.com>
> 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" <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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