Problem with board antenna in nRF9151-DK.

[oscargomezf]

Hi,

I am trying to use the nRF915-DK with a GNSS Tracker application. Everything works fine, but, I am not able to set the nRF9151-DK properly for utilizing the board GNSS antenna.

What CONFIGs defines I have to use in prj.conf file If I want to use BOARD antenna? and, What are the right ones to use external antenna?

Best regards,

Óscar.

[Michal]

Hello,

From the DK documentation:

An external active GNSS antenna can be connected to the U.FL connector J2. The default 3.0 V DC is fed through J2 to supply the LNA of the external antenna. The voltage can be changed through the board controller. When using an external GNSS antenna, the onboard GNSS LNA (U2) must be disabled to avoid interference. This is done by ensuring that the VEN signal is low and set by the %XCOEX0 AT command.

Best regards,

Michal

[oscargomezf]

When I tried this set up:

# Use onboard antena with COEX0 by default:

CONFIG_MODEM_ANTENNA_GNSS_ONBOARD=n
CONFIG_MODEM_ANTENNA_GNSS_EXTERNAL=y

The GNSS works perfectly, but when I use this set up:

# Use onboard antena with COEX0 by default
CONFIG_MODEM_ANTENNA_GNSS_ONBOARD=y
CONFIG_MODEM_ANTENNA_GNSS_EXTERNAL=n

With the nRF9151-DK in clear sky with direct line of sight to satellites, I am not able to get a fix.

Does anyone any suggestion?

[Michal]

I will check that internally.

If you have the AT command interface on as well (or maybe can try to turn it on) you could check with the AT%COEX0? command.

Best regards,

Michal

[Michal]

Sorry, I forgot to ask: which NCS and Modem FW versions are you using?

Best regards,

Michal

[oscargomezf]

Hi Michal,

Thank you for your support.

Modem FW version: nrf91x1_2.0.2

Best regards,

Óscar.