[time-nuts] Accuracy/drift of Garmin GPS 16 HVS 1 PPS output under invalid fix conditions...

[Bob kb8tq]

Hi

I doubt you will find this sort of information in any spec sheet on a basic GPS. The only practical
answer is going to be “try it and see”. If this is for some sort of large scale system, that may not
be the right way to do it……

Bob

> On Mar 10, 2019, at 11:48 PM, Steve Olney <t0502 at internode.on.net> wrote:
> 
> Hi All,
> 
> Just a basic question for an application with low accuracy requirements.  I only need an accuracy of +/- 1 ms on the 1 PPS signal.
> 
> Does anyone have any data on the behaviour of a Garmin GPS 16 HVS (or be able to point me in the right direction to find such data) w.r.t. the 1 PPS output when a valid fix is not available.
> 
> I need this to determine whether the 1 PPS hold-over accuracy is sufficient to maintain the 1 PPS within +/- 1 ms of GPS time during a loss of GPS lock of, say, 15 minutes.
> 
> I know that different manufacturers might handle the hold-over differently - so I need some experience of others with Garmins.
> 
> The only information I can find about Garmins is that the 1 PPS holds within the +/- 1 us specification for up to 4 seconds of invalid fix conditions.
> 
> Cheers
> 
> Steve Olney
> 
> HawkRAO
> 
> http://hawkrao.joataman.net/pulsar/daily_obs/index.html
> 
> 
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