On Sun, 17 Feb 2019 00:49:58 +
Mark Sims wrote:
> The two candidates for the F9P are "add current sawtooth" or "subtract
> previous sawtooth". I had been favoring "subtract previous" but some more
> detailed analysis seems to favor "add current". The difference between the
> results of
Hi
One *could* suggest that the manual would be a great source of information for
this sort of thing.
The problem there is that pretty much the whole manual talks about the M8 as
the target device
once you get into the fine print. The big points have been translated over to
the F9P. The fine
Hi
The gotcha is that the jitter on the base pps output is high enough in this
case that doing a reasonable
check (roll over … ) is not as simple as it should be. Best guess is that uBlox
has a bug in their GPS
side of things. Pretty much par for the course on something this new.
Bob
> On
The F9 has a totally new internal architecture / processor, so it's best to
make no assumptions about how it works compared to older models.
For the LEA-6T the correction strategy is clearly "add previous sawtooth
value". That does not work for the F9P.
The two candidates for the F9P are
Mark Sims writes:
> For all the receivers that I have tested there is only one combination
> that jumps out as being the correct one. However, for the new Ublox
> F9P, there are two combinations that produce virtually identical
> measurements and statistics (add current sawtooth or subtract
Why "virtually" and not exactly identical? Maybe the answer is in the details...
On Sat, Feb 16, 2019 at 12:01 AM Mark Sims wrote:
>
> I am adding the ability to Lady Heather to apply receiver sawtooth correction
> values to measured PPS values... this requires having a receiver that outputs
>
Hi
Well … since you asked …. ummm… F9P:
Run a second type of receiver ( Furuno GT-87 maybe)
Measure it
Sawtooth correct it
Compare corrected receiver A to corrected receiver B
Sure am glad that I’m too far away to be hit by that rock that just got tossed
my way :)
Bob
> On Feb 15, 2019, at
In message , Mark Sims writes:
>For all the receivers that I have tested there is only one combination
>that jumps out as being the correct one. However, for the new
>Ublox F9P, there are two combinations that produce virtually identical
>measurements and statistics (add current
I am adding the ability to Lady Heather to apply receiver sawtooth correction
values to measured PPS values... this requires having a receiver that outputs
sawtooth values as the main input device and connecting a TICC/counter
measuring the receiver PPS output as an auxiliary input device.
