[time-nuts] nuts about position

Bob kb8tq kb8tq at n1k.org
Fri Jun 1 13:36:17 EDT 2018


Hi

Indeed, if you look at a 30 minute data file from any of these receivers, it will not be giving you
quite the same performance. 

Bob

> On Jun 1, 2018, at 1:00 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> 
> Hi,
> 
> Well, when the resolution and stability is sufficient, other aspects
> weigh in, as being quick to have reduce biases in position and time.
> You can resolve much by averaging etc. but that takes time.
> 
> Cheers,
> Magnus
> 
> On 06/01/2018 02:10 PM, Bob kb8tq wrote:
>> Hi
>> 
>> I can’t say that’s a big surprise. The silicon on these gizmos made it past the “overkill” point at least 
>> a decade ago. There’s only so much you can do with a noisy signal ….. Yes, there are indeed feature
>> differences, ( like the Furuno pps ). The core of the device seems to have hit a limit a while ago. 
>> 
>> Bob
>> 
>>> On May 31, 2018, at 11:15 PM, Mark Sims <holrum at hotmail.com> wrote:
>>> 
>>> I did another test to see if the M8T offered any positioning advantage over the old (and cheap) LEA-4T and LEA-5T devices.   I drove the M8T and LEA-4T with the same antenna,  collected data for 12 hours,  beamed the RINEX files to Canada.
>>> 
>>> The results matched to within 3mm...  so, again, the M8T doesn't offer much benefit for getting precise positions.
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