Teseo-LIV3F, no satellite position.

[Sergei]

Hello, Can you help me?

I assembled a module on the Teseo-liv3f basis with a passive antenna (A25-4102920-AMT02). And I can not get the coordinates in nmea messages (screenshot in attach). What could be the problem?

Thank you.

[Francesco Virlinzi]

Hi Sergei.

Do you have LNA and SAW filter in the RF-path?

Regards

Francesco

[Sergei]

Francesco,

I do not have an LNA and SAW filter. I use a minimum of connections.

Thank you.

[Francesco Virlinzi]

​Hi Sergei.

Sorry for the wrong image. I'l take an action to fix the document.

LNA and SAW are strongly suggested as reported in Chapter '6'.

Sorry for the mistake.

Regards

 Francesco

[Sergei]

Francesco,

quote "Chapter 6.1 A passive antenna can be directly connected to Teseo-LIV3F. Take care that the antenna has to be close to the module...."

What about this? It is also mistake?

Regards

[Francesco Virlinzi]

Hi Sergei

It seems you are reading an old doc version.

The new one is online @

• https://www.st.com/resource/en/user_manual/dm00399112.pdf

Regards

Francesco

[FResi]

Hi Francesco,

I have the same problem with my Teseo-LIV3F module. It is connected to an active GPS antenna with an external power supply.

I receive several GPS satelliteﾠ with a very good field strength as following picture:

The first time I tested the module, I've got the fix 3D for about 4 hours. 

After that, I can't have the fix and I don't have the position:

I've tried to update the ephemeris but with no result

 

In all my tests, only one time I saw one GLONASS satellite for about half an hour.

Can you help me?

Best regards

Francesco

[Francesco Virlinzi]

Ciao Francesco

Is the module restarting correctly powering-OFF an ON?

Thanks

Regards

Francesco

[FResi]

Ciao Francesco,

I turned it OFF and ON several time, while it was working (FIX 3D) and not working (no FIX).

I'm using Teseo-Suite Pro v5.2.3.1.

Every time I powered-OFF and ON, I could receive NMEA messages, write commands and receive several GPS satellite with good C/N.

Regards

Francesco

[Francesco Virlinzi]

Ciao Francesco

Could you check in which production slot has been assembled the module you have?

On top of the shield:

"YWW" means 'Year-week'

Thanks

Ciao

Francesco