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