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

[Steve Olney]

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