[ntp:questions] lots of GPS modules and info at SparkFun

unruh unruh at invalid.ca
Tue Feb 14 00:57:00 UTC 2012

On 2012-02-13, Dave Hart <hart at ntp.org> wrote:
> On Sat, Feb 11, 2012 at 10:20, Terje Mathisen wrote:
>> unruh wrote:
>>> GEt the manual from Mediatex MTK NMEA Packet User Manual, which gives a
>>> far far more extensive set of nmea programming instructions for the
>>> chipset that Sure uses.
>> Does that one have more info than my current program?
>> C:\c2\nmea-mtk>Release\nmea-mtk.exe -?
>> nmea-mtk (c) 2011 Terje Mathisen
>> Syntax: nmea-mtk [options]
> The SURE electronics unit people have been buying as an affordable
> refclock for those with soldering skills and time is the reference
> design for the SkyNet SKG16AH chip known as SKG16B [1].  Unruh and
> Terje are talking about a MTK (I or II?) chipset.  Does anyone know
> the relationship between the two?  I'm wondering if there's a way to
> refer to both unambiguously, or if they're subtly different beasts.
> After a little more digging I came across a nice comparison table of
> chipsets [2] which suggests to me the SKG16AH is derived from or
> clones the interface of a MTk design.  If you have additional insight
> or can correct me, I'd appreciate it.

I once tried most of the commands listed for the mtk on the sure board,
and most of them worked as advertised. Unfortunately I did not keep a
list of those that were noops on the sure board, but you will find out
soon enough if you try them. Most work.

> [1] http://www.skylab.com.cn/datasheet/SkyNav_SKG16AH_DS.pdf
> [2] http://wiki.openstreetmap.org/wiki/GPS_Chipset
> Cheers,
> Dave Hart

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