[Loadstone] No GPS time with wintec wbt300

Raymond Jansen r.jansen at wanadoo.nl
Sun Jun 10 14:08:19 BST 2007


Hi Shawn and Hasan,

I have a WBT201 which also contain the Antaris4 chipset, and this one does 
receive the time and date correct.

Regards,

Raymond

----- Original Message ----- 
From: "Shawn Kirkpatrick" <shawn at odyssey.cm.nu>
To: "LoadStone" <loadstone at loadstone-gps.com>
Sent: Sunday, June 10, 2007 2:41 AM
Subject: Re: [Loadstone] No GPS time with wintec wbt300


> This is a strange problem. Loadstone uses the following nmea fields: GGA,
> GSA, GSV, RMC. It can also use the gll and vtg fields but they're 
> completely
> untested and aren't really needed if you have gga and rmc. All of these
> should be set to be sent once per second except for gsv, that should be 
> set
> to send every 5 seconds since multiple messages come in with that one. As
> far as time goes, gga and rmc both contain time information. The gga 
> message
> contains the time of day and the rmc messages contains this same time of 
> day
> as well as a current date field. In order for loadstone to do anything
> useful you need at least the gga and rmc fields. If you're getting those 
> you
> should be getting the correct time as well. The only time the time should 
> be
> wrong is right when the receiver is started up and hasn't locked on to a
> satellite. If you have a valid gps signal then you should also have a 
> valid
> time. Even when the time is wrong it'll still change, not get stuck on a
> single value. If this problem is consistant then turn on loadstone's 
> logging
> and send me a copy of the log off list. Maybe this receiver is outputting
> something different from what's expected. As far as the other fields go 
> they
> can probably be turned off but if you're going to send me a log of what 
> this
> receiver is doing then maybe leave them on so I can get an idea of what
> those messages can contain.
>
> On Sat, 9 Jun 2007, Hasan Karahasan wrote:
>
>> Hello folks,
>> a fiew months ago I wrote about this here, but because I had very less
>> information, we couldn't solve this issue together in this list.
>>
>> Once again to remember: Loadstone does not get the correct GPS time using 
>> a
>> wbt 300 with the antaris 4 chipset. Pressing the star key always results 
>> in
>> constantly being 02 O.Clock. No change at all.
>>
>> Now I have played around with its configuration tool. It is well 
>> accessible
>> with Jaws. You can set the receiver's update rate from 1 to 4 hz and you 
>> can
>> enable or disable each NMEA record. You can also set the interval in 
>> seconds
>> how often a record is to be transmitted.
>>
>> The receiver offers the following NMEA records:
>> GGA, GLL, GSA, GSV, RMC, VTG, GRS, GST, ZDA, GBS, DTM.
>>
>> I have set them all to be repeated once per second. So maybe someone of 
>> you
>> can recognize what is going wrong here. For example, I read about a NMEA
>> record named GDT that is used for time and date information. This record
>> definitely does not exist in my receiver's output. But it uses the ZDA
>> record instead. As I can see this is also a kind of date and time info.
>>
>> Well, what comes up to my mind is:
>> Wich of the above records are needed by loadstone?
>> And does it make any sence to disable the records not used by loadstone?
>> Is this missing GDT record causing my time problem?
>>
>> Thanks for any idea.
>> Hasan
>>
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>>
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