MAGPIO and COEX0 settings for gps sample

[paul_tanner]

I do not understand how to compose these settings.

Using ncs v1.5.0 GPS sample with SUPL enabled.

This works OK on nrf9160-DK using the supplied settings

#define AT_MAGPIO "AT\%XMAGPIO=1,0,0,1,1,1574,1577"
#define AT_COEX0 "AT\%XCOEX0"

I have another setup with the same antenna but on a much simpler board.

The main difference is that this other board has no LNA.  However, the GPS antenna is also a MOLEX 206640.

Evidently the above settings are wrong and the GPS sees no satellites.

The software is identical.

Any suggestion please.

[Albrecht Markus Schellenberger]

Hello Paul,

my apologies for the late reply. We have been out of office yesterday due to a public holiday here in Norway.

There is some documentation about COEX in chapter 4.16 of the nRF9160 Hardware Design Guideline and chapter 3.6. in the nRF9160 Hardware Verification Guideline gives you some advice on how to use it.

Is this something that might help you?

Regards,

Markus

[paul_tanner]

Thx Markus.  I had noticed as much from the circuit diagrams for the nrf9160-dk.

The links says "When controlled by the LTE modem, MAGPIO timing is aligned with the LTE protocol, which enables LTE protocol synchronous control for nRF9160-external components, such as the antenna tuner. For more information, see LTE modem RF control external interface in nRF9160 Product Specification." 

Within that there's a link that is broken.

Regards.

[Albrecht Markus Schellenberger]

Thanks a lot for the feedback, Paul! The broken link is supposed to refer to chapter 7.4 of the nRF9160 Product Specification.

Regards,

Markus