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Re: ✘NEO-M9N
From: |
Gary E. Miller |
Subject: |
Re: ✘NEO-M9N |
Date: |
Wed, 12 Feb 2020 14:27:43 -0800 |
Yo Frank!
On Wed, 12 Feb 2020 17:09:58 -0500
Frank Nicholas <address@hidden> wrote:
> > I think the GNSS 7 is somewhat better:
> >
> > Price: $40 $65
> > Antenna Connector: SMA u.fl
> > Backup: Super Cap battery
> > Berg Pins: Installed Just holes
> > Size: 57x25 mm 40x33 mm
> > Mounting holes No Yes
>
> Site for the product you linked says Backup: ___Battery Holder +
> Battery___.
My mistake, yes, both are battery. I was looking at another board at the
time and conflated the two.
> It___s also ___Open Hardware___, released
> under the Creative Commons Attribution Share-Alike 4.0 License. I
> see +/- for both boards (cost especially for the board you linked).
The schematics for the GNSS 7 are also available. Not sure the license.
> There is a lot of official/good uBlox documentation linked from the
> Sparkfun uBlox product pages for the board & antenna (see antenna
> mentioned below)
Or, just go to u-blox.com and get the latest rev doc.
> > One takeaway is that GPS antennas do not work well with modern
> > multi-GNSS receivers.
>
> This is why I purchased these items with the module:
> Interface Cable RP-SMA to U.FL - WRL-00662 - SparkFun Electronics
I hate that part.
> uBlox brand multi-band
> antenna: GNSS Multi-Band Magnetic Mount Antenna - 5m (SMA) -
Overkill, you only need an L1/E1/GLONASS antenna. The L2/L5 in that
antenna adds a lot of cost, not use on the M9N.
> GPS Antenna Ground Plate -
I use old 3.5" HDD platters. Almost exactly the size that u-blox
recommends, and they do help a tad.
> I hope the antenna is worth the price - $64.95 USD. With it being a
> uBlox part (ANN-MB-00), it might be available elsewhere for less.
Very few L1/L2/L5 antennas on the market, yet. So the price is not bad
for what you get.
> For $4.95 USD, it___ll be interesting to see what/if the steel disk
> improves.
You should get, on average, one half extra sat used.
> > For somewhat over $200 the ZED-F9x can approach similar accuracy to
> > survey receivers costing thousands. But the NEO-M9N will not be in
> > that class. I'll post plots after I get the NEO-M9N that I orderd.
>
> The antenna I linked above is ___ Designed for the latest u-blox F9
> platform--including the ZED-F9P module___, with ___L1/L2 dual reception___.
Yes, but you only have L1 in the NEO-M9N.
> Sparkfun has this ZED-F9P module for $219.95 USD: SparkFun GPS-RTK2
> Board - ZED-F9P (Qwiic) - GPS-15136 - SparkFun Electronics
I have tried other brands of ZED-F9P. They are nice, but I'll wait for
the price to come down before buying them.
> My main hobby/use for these modules is time keeping. Does L1 only
> vs. L1/L2 improve time accuracy enough to measure/matter for the cost?
The improvement in PPS is below what you can measure with KPPS. But
you will see the added location accuracy.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden 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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