[Lowfer] Atomic Clock Oddities.

[Andy - KU4XR]

> On Tue, Sep 29, 2009 at 11:04 PM, KD7JYK DM09 <kd7jyk at earthlink.net>
> wrote:

> What would cause different atomic clocks in different states to 
> suddenly show random dates and days, even days and dates that
> don't match?
>
> Kurt


--- On Wed, 9/30/09, Zack Widup <w9sz.zack at gmail.com> wrote:



> Most of those "atomic clocks" are really WWVB receivers. 
> Maybe QRM got to them somehow?
> 
> 73, Zack W9SZ


Hello All:

A few days ago, I was calibrating some software using WWVB as a
signal source. I wanted the signal to be very weak so I disconnected
all but a 4 foot jumper cable. During the daytime, and the 4' jumper,
WWVB was still aubible here in Tn. I shorted the center pin to the 
outer ring, and with the cable " grounded " I was still hearing
WWVB very faintly. I was a little surprised that my ground system
could have that much RF capability. That brings up another thought
about DC ground vs. RF ground ( different subject )
As Zack said, the clocks are mini WWVB receivers with loop bar ant.
WWVB sends binary data thru carrier power adjustment. Since it is a
radio wave; QSB, atmospherics, and QRN can all have a factor in what
the mini receiver " hears " at any given moment. Ground wave, and
skywave possibly causing phase cancellation of the signal. If the
binary code sent is corrupted in any way; the wrong interpretation
could be made at the receiver end. 


Andy - KU4XR - EM75xr - Friendsville, TN.
LOWfer Beacon " XR " @ 184.322 KHz ( QRSS-60 )
Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
http://www.myspace.com/beaconxr


--- On Wed, 9/30/09, Zack Widup <w9sz.zack at gmail.com> wrote:

> From: Zack Widup <w9sz.zack at gmail.com>
> Subject: Re: [Lowfer] Atomic Clock Oddities.
> To: "Discussion of the Lowfer (US, European, &, UK) and MedFer bands" <lowfer at mailman.qth.net>
> Date: Wednesday, September 30, 2009, 1:53 AM
> Most of those "atomic clocks" are
> really WWVB receivers. Maybe QRM got to
> them somehow?
> 
> 73, Zack W9SZ
> 
> On Tue, Sep 29, 2009 at 11:04 PM, KD7JYK DM09 <kd7jyk at earthlink.net>
> wrote:
> 
> > Yesterday, a friend mentioned her atomic clock was
> showing the day as next
> > friday, the date correctly.  This afternoon, I
> come home to find one of my
> > three atomic clocks indicating next Saturday, both by
> day and date, an
> > identical model in another room shows the correct day
> and date.
> >
> > My friends clock is seven seconds slow on the time, I
> have not been able to
> > check mine.
> >
> > What would cause different atomic clocks in different
> states to suddenly
> > show random dates and days, even days and dates that
> don't match?
> >
> > Kurt
> >
> >
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