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

[paul swed]

Todd looking at the spec sheet do you have the gps option also??
If so it should lock I would expect.

On Fri, Sep 2, 2022 at 2:05 PM paul swed <paulswedb at gmail.com> wrote:

> 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
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe send an email to time-nuts-leave at lists.febo.com
>>
>