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

unruh unruh at invalid.ca
Sun Feb 19 16:45:18 UTC 2012

On 2012-02-19, TomK <forensic at milwpc.com> wrote:
>   FYI: Garmin OEM version 18x LVC 5M is a fun toy, for about 65.00USD. 
> You have to solder a 9-pin D-sub RS232, but where I am the unit locks on 
> 6-9 satellites, indoors. I have nine such units, some of which have 
> lived outdoors and endured at least five years of -10 F winters and +100 
> F summers, without flinching.

Two of my Garmin 18 (not x) seem to have bit the dust after about 3
years. That is in Vancouver, where the winters can be pretty rainy, and
the units were unprotected.

> On 02/13/12 02:31, Paul J R wrote:
>> Figure I might chime in with the gps unit I got and if your in Aust i
>> think its probably about the best deals i've seen that has a pps line
>> (theres also another one they have if you can do smd soldering thats
>> cheaper again).
>> http://www.twig.com.au/store/product_info.php?products_id=108&osCsid=148a3e8759d5ae6b8ab6f3f0489e0fd4
>> <http://www.twig.com.au/store/product_info.php?products_id=108&osCsid=148a3e8759d5ae6b8ab6f3f0489e0fd4>
>> I was looking to put together the dirt-cheapest ntpd machine with pps i
>> could, and that was the cheapest i could find (though i havent had the
>> time to put mine together as yet because the pps line does need some
>> soldering). I also happened to have a wyse terminal (x86 based)
>> http://www.wyse.com/products/hardware/thinclients/S10/index.asp that i
>> picked up for around 30$ (currently running ubuntu 10.10 server without
>> too much drama).
>> On 13/02/12 13:00, Dave Hart 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.
>>> [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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