[Gta04-owner] GPS fix?

[Boudewijn]

On Tuesday 15 November 2011 14:46:03 Neil Jerram wrote:
> On 15.11.2011 13:40, Dr. H. Nikolaus Schaller wrote:
> > But the module starts sending NMEA records (with 0 satellites and
> > void
> > location data) on /dev/ttyS1 as soon as you give one  impulse on the
> > on/off line.
> > Please compare (slightly updated):
> > 	http://projects.goldelico.com/p/gta04-kernel/page/GPS/
After a few minutes next to a window, my log quite resembles Neils:

$GPGGA,000919.031,,,,,0,00,,,M,0.0,M,,0000*55
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,000919.031,V,,,,,,,130806,,,N*42
$GPGGA,000920.031,,,,,0,00,,,M,0.0,M,,0000*5F
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,000920.031,V,,,,,,,130806,,,N*48
$GPGGA,000921.041,,,,,0,00,,,M,0.0,M,,0000*59
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,3,1,12,20,00,000,,10,00,000,,25,00,000,,27,00,000,*79
$GPGSV,3,2,12,19,00,000,,07,00,000,,04,00,000,,24,00,000,*76
$GPGSV,3,3,12,16,00,000,,28,00,000,,26,00,000,,29,00,000,*78
$GPRMC,000921.041,V,,,,,,,130806,,,N*4E
$GPGGA,000922.031,,,,,0,00,,,M,0.0,M,,0000*5D
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,000922.031,V,,,,,,,130806,,,N*4A

> > What test did not check is if the internal antenna switch and power
> > supply is working
> > well enough and does not have too much attenuation for good
> > reception.
I have an external antenna, but with an oldfashioned connector, ie, about 3 
times the diameter of the one on the GTA02/04. I haven't been able to find an 
adapter. For a new antenna goes the same as Neil: see if I can pick up one for 
a nice price.

Might opening the battery cover help? Are best results expected while pointing 
the antenna up, keeping it vertical or horizontal?

> > 
> > A common problem of the internal GPS antenna module is that the cable
> > may
> > break at the end that is soldered to the module during some
> > disassembly of
> > the units.
Is a broken cable easily recognized? The cable is quite stiff, does it become 
less stiff if it's broken? The connector gave a little "snap" when pressing it 
on, so that side seems ok.

Now, a few minutes later, comparable results:
$GPGGA,001612.043,,,,,0,00,,,M,0.0,M,,0000*55
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,001612.043,V,,,,,,,130806,,,N*42
$GPGGA,001613.031,,,,,0,00,,,M,0.0,M,,0000*51
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,001613.031,V,,,,,,,130806,,,N*46
$GPGGA,001614.031,,,,,0,00,,,M,0.0,M,,0000*56
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,001614.031,V,,,,,,,130806,,,N*41
$GPGGA,001615.039,,,,,0,00,,,M,0.0,M,,0000*5F
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,001615.039,V,,,,,,,130806,,,N*48
$GPGGA,001616.031,,,,,0,00,,,M,0.0,M,,0000*54
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,3,1,12,20,00,000,,10,00,000,,25,00,000,,27,00,000,*79

I'll read up on what the signals mean, so I got some idea myself as well what 
is going on.

Boudewijn
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