Re: SparkFun GNSS L1/L5 Breakout - NEO-F10N, SMA - GPS-24114 - SparkFun Electronics

[Gary E. Miller]

Yo Frank!

On Fri, 22 Mar 2024 19:10:33 -0400
Frank Nicholas <frank@nicholasfamilycentral.com> wrote:

> Really?  I noticed the L2/L5 band difference.  And now I see the F10N
> is missing the GLONASS constellation.  F10N claims “ meter-level
> positional accuracy”.  M9N claims “~1.5 meter accuracy”.  

Depends on the M8 version.  Some are L1/L2 and some are L2/L5

The u-blox product line card has good comparisons:

https://content.u-blox.com/sites/default/files/GNSS_LineCard_UBX-13004717.pdf

To me a big problem with the M10N is the lack of native USB.  The
native USB means you never have to worry about speed, parity, or
overflowing the serial port.

Missing the GLONASS is a feature.  Adding NacIC is no use in the Americas.

Here is the F10N data sheet:

https://content.u-blox.com/sites/default/files/documents/NEO-F10N_DataSheet_UBX-23002117.pdf

CEP(50) is 1m over 24 hours, so hat is nice.  But PPS is 30 to 60ns.

Cold start is 28 seconds.
Max rate 10Hz.

Limited to 4G, so best used in static applications.

The serial port is hard wired to a USB-Serial chip.  So you have to
mode the board to get serial.

The F10N is new, and new to me, and better on paper than the first M10
parts I have looked at before.

By comparison, the M9N:

https://content.u-blox.com/sites/default/files/NEO-M9N-00B_DataSheet_UBX-19014285.pdf

Same:

It is the same in PPS and the 4g.

Better:

It can cold start in 24 seconds, not a big win over 28.  And max rate of
25Hz, a win over 10, but I think the rate are interpolated numbers.

Has USB and serial ports.  Can take RTM3.3

A few added firmware features.

Worse:

CEP(50) of 2m, so that is worse.

In summary:

The big win is the M9N can take RTCM3.3 and has the USB.

> For USA use (mainly timekeeping), do those make it 2/3 as good?  I’m
> not questioning your knowledge/statement, I'm just trying to
> understand/learn.

For timing, looks like a toss up.

> BTW - for almost 1/2 the price for 2/3 as good, maybe it’s still a
> better deal, depending on needs?

For timing, the F10N is a win at any price.  

If one needs high data rate, or RTCM then the M9N is the win at any price.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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