[time-nuts] Fwd: CGSIC: FW: Official Press Release - GPS Ground System Anomaly

Magnus Danielson magnus at rubidium.dyndns.org
Thu Jan 28 14:13:22 EST 2016


Tom,

On 01/28/2016 04:58 PM, Tom Van Baak wrote:
>> I've not been following this discussion too closely, but were the nav
>> solutions from the GPS steady and continuous during the event (that is,
>> was just a time discontinuity).  I'm guessing that since the problem was
>> only in the "how to convert from GPS to UTC" parameters that the nav
>> solution was steady.
>
> Jim,
>
> Nav solutions were fine. Time solutions were fine. It was just a UTC offset problem (and then only for some receivers).

Quite a lot of receivers it turns out.

The way it works, many receivers could go lucky through the events.

>> And this brings up an interesting question. On receivers that provide a
>> 1pps, do they bring out the 1pps on GPS time or on UTC time.  I suspect
>> some are GPS and some are UTC.
>
> Almost all timing receivers allow you to choose between GPS time and UTC. It's in the manual. The TBolt and Z38xx-series and 58503-series make it really easy to switch from one to the other.

I find that most use in telecom and broadcast is to set them for UTC.

Cheers,
Magnus



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