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

[Gary E. Miller]

Yo Frank!

On Fri, 22 Mar 2024 22:24:53 -0400
Frank Nicholas <frank@nicholasfamilycentral.com> wrote:

> > Depends on the M8 version.  Some are L1/L2 and some are L2/L5  
> 
> Assuming a typo M8 vs. M9.  The Sparkfun M9 I linked is L1/L2.  The
> F10 I linked originally is L1/L5.  Generally which is better?  For
> timekeeping, based on same environment, which is better?

Yeah, typo.  I meant M9,  Technically the L5 is better than the L1, but
I have not seen a practical difference.

> > 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.  
> 
> My experience is that “native USB” still means you have to set serial
> port type parameters:  speed, parity, stop bits, etc.

Nope.  If you see /dev/ttyACMx, then you can set speed, parity, stop bits,
but it does nothing.  That is to support older software (stty) that
is confused by their lack.

If you have a /dev/ttyACMx, tyy it.  THose do nothing.

> In my opinion, lack of native USB is not an issue because the
> Sparkfun breakout board natively has the GPS chip serial connected to
> a USB chip/adapter on board, and a simple jumper/solder pad to change
> that on the breakout board for native serial pads.

YMMV.  Just hope the speed is fast enough for you.

> > Missing the GLONASS is a feature.  Adding NacIC is no use in the
> > Americas.  
> 
> Thanks - I suspected that it wasn’t valuable in the Americas.  :^)

Oh, GLONASS available world wide.  Better coverage than GPS.  Especially
at high latitudes.  But they track of UTC is sloppy.

> “NacIC” - I don’t know what that term is?  

Yeah, typo.  NavIC, formerly IRNSS.

https://en.wikipedia.org/wiki/Indian_Regional_Navigation_Satellite_System

> > Limited to 4G, so best used in static applications.  
> 
> Static/GPS timing is my use case.  I don't know what “4G” is.

G, as in Gravity.  Or more properly your acceleration due to gravity.
1G is 9.8 m/s^2 at mean sea level.

https://en.wikipedia.org/wiki/Gravity_of_Earth

So if you are in an airplane, and do aerobatics, the receiver may lose
lock.

> > For timing, the F10N is a win at any price.    
> 
> Thanks - that’s my use case, and why I originally asked/wrote what I
> did.  :^)

And, thanks for pointing it out to us.

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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