[time-nuts] Re: Syncserver S300 LFR 60 kHz WVVB

[paul swed]

Todd it is indeed the case. The phase modulation screws up the receivers.
It affected all of the more sophisticated receivers making them somewhat
useless. There are various hacks from somewhat simple to complex. Danger
may require code and a soldering iron. Some of these hacks work very well.
Sounds like a nice unit.
Regards
Paul
WB8TSL

On Fri, Sep 2, 2022 at 11:49 AM Todd Smith via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hello
>
>
>
> I stumbled upon this list while looking for some information to refurb a
> couple of older Symmetricom (Microsemi) S300 Syncserver NTP appliances
> equipped with the optional LFR 60 kHz kit.  I believe that I am receiving
> signal at my location since the LED on the back of the unit beside the LFR
> antenna  port blinks while it is running.  It shows unlocked in the GUI
> since it is apparently not decoding the signal.
>
>
>
> I have read where in 2012, NIST changed the format for WVVB from AM to a
> phase modulation and some receivers might not be able to decode the phase
> modulation.  Do you think that is the case here?  I need to get another
> WVVB receiver and test that I can receive signal at this location but I am
> high enough and away from interference sources so that leads me to believe
> that I am probably receiving signal.  Over 72 hours on the graph in the GUI
> and it never decodes a signal yet the back blinks the entire time.
>
>
>
> If phase modulation is the issue; is there a demodulator that I can get to
> correct the signal format?
>
>
>
> Thank you for your time
>
> Todd Smith
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