[time-nuts] Reference oscillator accuracy

[paul swed]

Well I have to say, I resurrected my gertch RLA1 wwvb rcvr. In New England
wwvb will be difficult.
I have had it running 2 weeks now and would guess its good to 1X10-11 sort
of. Just to many things going on.
Even though I have a resonated 60KC loop properly pointed at wwvb.

So will guess gps it will be. I sure liked LORAN C and the austrons as a
double check.
Experimenting with tracor 599h to see if they work better and supposedly
they can actually use the other vlf transmissions as a reference.

I have naa in maine about 100-150 miles. Its very very strong but has msk
keying.
Again reading the 559 manual it doesn't care. Will fire it up tonight to
see.
Heavens knows what naas stability is they certainly do not need it.
Regards


On Tue, Nov 17, 2009 at 3:37 PM, Don Latham <djl at montana.com> wrote:

> 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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>>
>>
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>
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