[time-nuts] WWVB Time

Graham / KE9H ke9h.graham at gmail.com
Tue Apr 10 18:56:39 EDT 2018


Did you move it near a desktop PC or other computer, or move a desktop, or
other PC, video screen or switching power supply in the vicinity of the
Symmetricom or WWVB antenna?

I am learning the hard way that PC and LED/LCD video screens are horrible
generators of noise in the LF spectrum.

--- Graham

==

On Tue, Apr 10, 2018 at 4:15 PM, Tom Van Baak <tvb at leapsecond.com> wrote:

> > Hi, all of a sudden my Symmetricom comparator/clock has been locking up
> on time.
> > It has been about a week so far. Did they change the code? Anyone else
> seeing that?
> > Doug K6JEY
>
> Hi Doug,
>
> That would be too good to be true. I asked NIST just now and they report:
> "We have not changed the code or power level. All things remain the same."
>
> So let's debug this on your end.
> - What make/model WWVB receiver are you using?
> - Can you check the accuracy of the time or frequency output against GPS /
> GPSDO. Is it NIST accurate or a bad copy of 60 kHz?
> - Did you power-up any new instrument in the past week, one that might
> cause 60 kHz harmonics?
> - Can you check with 'scope or spectrum analyzer what your environment
> looks like near 60 kHz?
> - Do you have a curious neighbor who is experimenting with a WWVB
> simulator...
>
> /tvb
>
> ----- Original Message -----
> From: "Doug Millar via time-nuts" <time-nuts at febo.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, April 10, 2018 1:23 PM
> Subject: [time-nuts] WWVB Time
>
>
> Hi, all of a sudden my Symmetricom comparator/clock has been locking up on
> time. It has been about a week so far. Did they change the code? Anyone
> else seeing that? Doug K6JEY
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