did...@cox.net
To: Time-Nuts time-nuts@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
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
You will need a receiver to compare your references to. It appears that
LORAN will be shut off, so that leaves two services available, either
WWV 60 Khz or GPS. I do not use WWV any more, I can tell you about GPS.
To compare against GPS you will need a timing receiver, there are
several
WWVB not WWV.
IMO, WWVB is MUCH fussier than LORAN. It's just utter stupidity that LORAN
is being shut down.
-John
You will need a receiver to compare your references to. It appears that
LORAN will be shut off, so that leaves two services available, either
WWV 60 Khz or GPS.
I use GPS and LORAN. Always nice to have a backup
With LORAN being shut down, have resurrected the ole wwvb rcvr and built an
amplified loop ant.
Can work but it takes about 3-5 hours to get to 1X10^11 accuracy. Still
observing various strange ness shuch as diurnal shift ...
Odd wwvb works at
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
paul swed
I use GPS and LORAN. Always nice to have a backup
With LORAN being shut down, have resurrected the ole
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.
How much is not much? Say over a 1000 km path. Are we talking
microseconds or picoseconds?
--
These are my
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
It's been a while since I was using an HP 117A, but from memory the
diurnal shift in Boston was a good part of a 1 cycle of 60 KHz or roughly
16 uS. To get good data, I'd have to run the stripchart for 24 hours (to
make sure track was not lost) and compsare readings at the same time each
day.
- Original Message -
From: Kasper Pedersen time-n...@kasperkp.dk
To: time-nuts@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
: Don Latham d...@montana.com
Date: Fri, 13 Nov 2009 15:01:47
To: Discussion of precise time and frequency measurementtime-nuts@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
On Fri, Nov 13, 2009 at 09:51:11AM -0800, J. Forster wrote:
WWVB not WWV.
IMO, WWVB is MUCH fussier than LORAN. It's just utter stupidity that LORAN
is being shut down.
I have emailed my brother in law who is a rear admiral (I think
now called a vice admiral) and currently CFO of the
I asked a close friend and fellow engineering alum who was deeply involved
in GPS and he thinks closing down LORAN is utterly idiotic.
IMO, there is something purely political, rather than technical, about
this decision.
Perhaps the GPS stakeholders don't want to admit just how vulnerable GPS
is
While I was in the US Navy we had two Cesium standards for the
navigation center on SSBN submarines.
While in port, we would track LORAN C and compute the drift rate of
the two cesium standards.
Is there a service, that has drift rates published, that I can
compare my standards to, so that I
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