[time-nuts] Lucent GPS UTC confusion

Magnus Danielson magnus at rubidium.dyndns.org
Mon Mar 28 19:53:12 EDT 2016


Hi,

Actually, most systems these days wants UTC rather than GPS time.

Cheers,
Magnus

On 03/17/2016 02:42 AM, Bob Camp wrote:
> Hi
>
> The CDMA world (and most systems) want GPS lock rather than UTC. The only real change is likely in the status messages. I strongly suspect that a “UTC locked” version will not send a double pps pulse (or drop one) at a leap second boundary …
>
> Bob
>
>> On Mar 16, 2016, at 8:29 PM, Joseph Gray <jgray at zianet.com> wrote:
>>
>> I noticed on the Status screen that the Lucent unit said the PPS was
>> locked to GPS, not UTC, as the Z3801A is. So, I issued ":DIAG:GPS:UTC
>> 1" and "TST?" to correct this.
>>
>> But things are not as I expected. Displaying the clock for both
>> GPSDO's in Z38xx now shows them to be 17 seconds different, which is
>> of course the leap seconds.
>>
>> This seems backwards. With both units set to UTC, why are they showing
>> different times?
>>
>> Joe Gray
>> W5JG
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