Agreed. I'm sure the only difference between the two (if there really is any) is all in the firmware. They seem to disable a lot of the nicer timing features in their non-timing modules. Things like UBX-CFG-TMODE2 to survey-in and enable 1SV timing mode is a big one.
-Dustin On Fri, Jan 25, 2019 at 8:00 AM Bob kb8tq <kb...@n1k.org> wrote: > > Hi > > In every other generation of uBlox parts, the “high end” modules (in this > case the P and the T) pretty much did the same > thing with only minor differences. You do need precise position to get > precise time. You also need precise time to get precise > position. That’s just the way GPS works and always has worked. > > What gets us wrapped up are a bunch of specs that really are not very well > qualified. Just what they mean be this or that > is rarely clear. Is a timing accuracy tracing it all the way back to BIH in > Paris? Is a location accuracy doing the same sort > of thing? Even when they try to quantify a spec, that footnote may or may not > be completely correct. A lot of these docs > still talk about the M8 parts when you drill down into them. > > The only way to really know is to try some parts and see. That’s the way it’s > always been with these modules from pretty > much all the vendors. > > Bob > > > On Jan 25, 2019, at 6:07 AM, Mike Cook <michael.c...@sfr.fr> wrote: > > > > So the ultimate question is: Do you need a F9P in order to find the > > precise position of your F9T Antenna so that you can set up the F9T or is > > the F9T’s survey mode as accurate ( I doubt it as the doc gives position > > accuracy 2m ). Come to think of it, do you need three positioning receivers > > to be sure of your position? and three P9Ts so that you can use > > differential mode for best timing accuracy. I see no on board quantization > > error correction mentioned, nor quantization error reporting though I > > expect that is there, so for best accurracy that has to be added. This > > looks as though it could get expensive. > > > > > >> Le 24 janv. 2019 à 07:30, Dustin Marquess <dmarqu...@gmail.com> a écrit : > >> > >> This looks ideal to me: > >> > >> https://www.u-blox.com/sites/default/files/RCB-F9T_ProductSummary_%28UBX-18069985%29.pdf > >> > >> -Dustin > >> > >> On Wed, Jan 23, 2019 at 8:01 PM Angus via time-nuts > >> <time-nuts@lists.febo.com> wrote: > >>> > >>> Hi, > >>> > >>> It doesn't look like the F9P does anything special for timing - the > >>> timing specs given in the F9T spec sheet are 5 ns (1-sigma, clear sky, > >>> absolute mode) and +/- 4ns jitter, but for the F9P are 30ns RMS and > >>> 60ns for 99%. > >>> > >>> I think I want an F9T :) > >>> > > > > In the year 1000 CE, the Persian Muslim scholar al-Biruni first used the > > term second in Arabic and defined it as 1⁄86,400 (that is, 1/(24 × 60 × > > 60)) of a mean solar day. > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
