Re: [Paparazzi-devel] LEA-5H NoFix Issue

[address@hidden]

Hi Pat and thanks alot for your reply,

It seems indeed that the issue is power-supply related, as the current 
indicator on the GCS shows way more 
fluctuation as soon as the GPS starts to look for its servers. Or is that 
normal?  See image; http://img59.imageshack.us/img59/9461/strangevoltage.jpg



Notations to the image;
1) is without GPS connected... as soon as its connected it looks the same but 
voltage displayed goes up to 11v... 
tiny spikes, no drops
2) is the phase where the GPS looks for servers... looks nasty.. 
3) is after 2-3 minutes outside. Still some spikes and drops, but not that bad 
anymore

I tried to change some power supply related settings in u-center, but with no 
success.

Please tell me how you solved your issues Pat, external power supply just for 
the GPS? Are 
we the only SPK-LEA5H+TWOG users out there having this or similar issues?  If 
yes, might this be related to defective 
hardware of some kind?



Regards



----Ursprüngliche Nachricht----

Von: address@hidden

Datum: 05.03.2010 05:06

An: <address@hidden>, <address@hidden>

Betreff: Re: [Paparazzi-devel] LEA-5H NoFix Issue



I've had a similar issue with that model GPS: I found, finally, that

the current available from the power supply seems to matter. Check

your power supply and make sure it isn't dipping down too far when you

attach the GPS.



On Thu, Mar 4, 2010 at 11:25 AM, address@hidden

<address@hidden> wrote:

> Hello everybody,

>

> I'm getting a odd issue when trying to get a GPS Fix in the Paparazzi GCS. In 
> U-center I can get a 3d fix in ca. 30

> secs no issues, but in the GCS it's never able to get a fix. It finds 
> multiple servers, the signal strength goes up 
to

> ~40dB and after a couple seconds the signal dies again and the GCS moves on 
> to the next server over and over again. 
The

> bars stay red until the signal dies, then they turn grey. In u-center the 
> message output looks great (to me), in the

> GCS only some messages do display a value and those are pretty unrealistic.

>

>

>

> This is from my airframe.xml;

>

> [...]

>

> CONFIG = \"tiny_2_1_1.h\"

>

> [...]

>

> ap.CFLAGS += -DGPS -DUBX -DUSE_UART0 -DGPS_LINK=Uart0 -DUART0_BAUD=B38400 
> -DGPS_USE_LATLONG

>

> ap.srcs += gps_ubx.c gps.c latlong.c

>

>

>

> I've tried to:

>

> -reset the GPS module using u-center and load the config file from the Wiki ( 
> http://paparazzi.enac.fr/wiki_images/Tiny_LEA-5H-v5.zip

> ) with no different end result.

>
> -reset the GPS module and configured everything from hand per the Wiki's 
directions with no different end result.
> -Flash the different Firmware Updates into the gps receiver ( 5.00 / 6.00 / 
6.02 )

> with no different end result.

>

>

>

> My setup:

>

> Twog // PPZUAV LEA-5H+active Sarantel Geohelix Antenna //XbeeProSeries2,2.4Ghz

>

>

>

> If someone could explain to me what I'm doing wrong I'd highly appreciate 
> that. I'm stuck since days here.

>

> If I shall post the message view output of u-center or my whole 
> airframe-config file just tell me what you need.

>

>

>

> Regards,

>

>

>

> Nico

>

>

>

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