[time-nuts] uBlox F9P versus F9T
Bob kb8tq
kb8tq at n1k.org
Wed Jul 17 21:37:48 UTC 2019
Hi
Having played with both, there are differences in how the P and the T do things. Both do a better job on
timing than single band modules do. The T has multiple pps outputs and *should* handle logging (at a
fairly coarse resolution) an input pps on two inputs.
Both will handle external correction inputs via a serial port. The P does not do SBAS, but the T does.
They now say that SBAS degrades timing on the T (as it does on all other receivers) so that may not be a plus.
I have not checked the latest firmware on the T, but with the last version, the P actually delivered better
timing performance. Indeed it was running defaults so SBAS likely running at the time.
If you are trying to do some sort of master / slave setup, it’s best to dive into just what is involved with
that task. For a system where both master and slave are mobile, the P is likely the better choice.
Bob
> On Jul 17, 2019, at 4:57 PM, Glen English VK1XX <glenlist at pacificmedia.com.au> wrote:
>
> The F9T and F9P - are these interchangeable for stationary timing use and stationary high performance position ?
>
> From how I read the datasheets, :
>
> >>the F9P has an internal RTK engine, and the F9T outputs the info RTCM etc and that data can be run on a external RTK engine on a micro.
>
> The P provides 1.5m standalone positional accuracy compared to the T standalone positional accuracy of 2.0m. Not much difference there..
>
> >> the F9P and F9T have their timing pulse performance shown using different description.
>
> The P has this as "RMS and 99%", while the T has this as '5nS','2.5ns diff'
>
> >>> Both can operate with companion receivers to enhance performance but I interpret this as only the P can do a (internal, companion mode) differential position fix and only the T can do a (internal companion mode) differential time fix. That is , internally without using an external engine.
>
> ***
>
> So it seems, if using an external RTL etc engines, the devices can do roughly the same thing.
>
> How do others interpret this ? I want to do projects using positional for one app, and timing for another, and would like to be able to acheive the deep quantity discounts...
>
> glen
>
>
>
>
>
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