Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-12 Thread MLewis
On 12/02/2017 6:49 PM, David Witten wrote: Is this perhaps the reason this firmware is marked "Not for Timing Use"? The 2.01 Release at this location is similarly marked. Dave According to posts in the ublox forum, there are specific issues regarding timing specific features in the timing produ

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-12 Thread David Witten
This behavior is described in the document: u-blox 8/M8 Firmware v 3.01 for Standard Precision GNSS, Release Notes This document says, among other things,: "New multi-GNSS messages use UTC as time

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-12 Thread MLewis
On 12/02/2017 1:50 PM, Pete Stephenson wrote: What firmware version are you using? Are you sure it's an authentic u-blox receiver? There's a bunch of fakes out there that identify as u-blox but lack some functionality. I recently purchased an M8T and the UBX-MON-VER message shows the firmware v

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-12 Thread Pete Stephenson
On Sat, Feb 11, 2017 at 4:31 AM, MLewis wrote: > With this NEO-M8T, I've even turned off everything but min=4/max=8 for GPS & > GLO, and it won't accept any configuration for Galileo, let alone enable. > And that's with the required NEMA of 4.1. What firmware version are you using? Are you sure

[time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-11 Thread Mark Sims
I don't have an M8T, only an M8. Heather defaults to showing up to 14 satellites. You can specify more sats or a dual column display using the SI or GCT commands or you can click the mouse on the satellite info table. You can also use the SG command to set the GNSS configuration, but version 5

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-10 Thread MLewis
With this NEO-M8T, I've even turned off everything but min=4/max=8 for GPS & GLO, and it won't accept any configuration for Galileo, let alone enable. And that's with the required NEMA of 4.1. Specifically, from u-center, the Signals checkbox for E1 - with a Signals selection listed as a mandat

[time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-10 Thread Mark Sims
The Ublox multi-GNSS receivers are incredibly picky about the channel allocations. Basically if you don't use the default channel min/max values they either won't work or are very flakey. I tried values other than min=4/max=8 for Galileo and nothing worked. Also, if you have SBAS enabled yo

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-09 Thread MLewis
wow Five M8Ts. And here I was feeling extravagant having splurged for one... I'm only seeing between 20 and 25 signals, but there's a bank of concrete&steel brick-clad buildings opposite. And typically with the majority of signals coming from north of my building, they're coming in off those b

[time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-09 Thread David Witten
-0500 > From: MLewis > To: Discussion of precise time and frequency measurement > > Subject: [time-nuts] u-blox NEO-M8T GPS initial tracking test > Message-ID: <589bcfe7.4010...@rogers.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed&q

[time-nuts] u-blox NEO-M8T GPS initial tracking test

2017-02-08 Thread MLewis
Anticipating issues with multipath, signal levels and a limited skyview, along with discovering that the tallest building in my skyview with a military computer centre has various stealth antennas around its roof, I went with: - u-blox NEO-M8T, mainly for its sensitivity, multi-GNSS (GPS, GLO &