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

[Bob kb8tq]

Hi

A “proper” timing device with antenna is a sub $100 sort of thing. It will be < 100 ns pretty much forever and ever.

Bob

> On Mar 11, 2019, at 4:44 PM, Steve Olney <t0502 at internode.on.net> wrote:
> 
> Hi Bob,
> 
> On 12/03/2019 12:19 am, Bob kb8tq wrote:
>> 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”.
> 
> Yes - agreed. I was hoping someone would have tried it already on the GPS 16 HVS unit as has been done for a different unit...
> 
> https://blog.dan.drown.org/navspark-timer-drift-2/
> 
> ...which returns about 0.1 ms drift in phase over 15 minutes.
> 
> I'll do a test as suggested elsewhere between a locked GPS and one which is in invalid fix condition.
> 
>> If this is for some sort of large scale system, that may not
>> be the right way to do it……
> 
> No - it's not a large scale system.  I want to time-stamp my Vela pulsar data.   Just recently I detected a glitch in the pulsar (the first amateur radio astronomer to ever do so with any pulsar AFAIK)...
> 
> http://www.astronomerstelegram.org/?read=12466
> 
> The professional guys were impressed with my data, but slightly disappointed it didn't have accurate time-stamping. I am working to rectify that for the next glitch.
> 
> Cheers
> 
> Steve
> 
> HawkRAO
> 
> 
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