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

MLewis mlewis000 at rogers.com
Sun Feb 12 19:36:19 EST 2017

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 products that are not 
in the SPG releases. Load it with an SPG release, and timing 
features/functions disappear.

One example given was a timing solution from a fixed location from a 
single satellite. Others were concerned that some messages in the stock 
M8T weren't present in the SPG 3.01 release, but some have confirmed 
that some timing specific messages are in the 3.01 SPG release. You'd 
have to check their forum to see if the messages you need are/aren't in 
the SPG release. I'm seeing the caution that once you flash a timing 
product with SPG 3.01, you can't go back (I presume because you don't 
have the bin of the timing firmware to put back on it).

I have managed to find the release note UBX-16004908 (.pdf) from 24 
February 2016 for FW3.01 TIM1.10, which includes  "The default 
configuration is optimized for timing applications and is compatible 
with the previous release FW2.30 TIMRAW1.02. The following table 
summarizes the significant differences between GNSS firmware 3.01 and 
the TIM1.x firmware."
The release also: lists new protocol messages and modified protocol 
messages; cautions that the mechanism for firmware update has changed; 
and, "The ranges of tracking channels that can be assigned to each 
constellation is more restrictive than in previous releases."

The release is only 120 kb, but I don't think I should be sending that 
out to everyone. Anyone who wants it and can't find it by the name 
above, email me for a copy.


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