[time-nuts] uBlox F9P versus F9T

[Bob kb8tq]

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
> 
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.