GPS w/NRF9160

rabarar

so I’m trying to run the sample nfed/gps example and can’t get a fix. I saw from a previous thread that the following CONFIG items were needed:

CONFIG_NRF9160_GPS_SET_COEX0=y
CONFIG_NRF9160_GPS_COEX0_STRING="AT%XCOEX0=1,1,1565,1586"

but attempting to build with these produces an error on unknown symbols for NRF9160_GPS_SET_COEX0

Thoughts?

jaredwolff

Should be:

# GPS Antenna configuration
CONFIG_MODEM_ANTENNA=y
CONFIG_MODEM_ANTENNA_AT_COEX0="AT\%XCOEX0=1,1,1565,1586"

In newer versions of NCS

rabarar

I see those in the ./gps/boards/circuitdojo_feather_nrf9160_ns.conf file

what about CONFIG_MODEM_ANTENNA_GNSS_EXTERNAL does that need to be set to use the connected GPS antenna?

jaredwolff

No that’s related to Nordic’s DK

rabarar

so any thoughts then on why no fix with line of sight?

jaredwolff

Do you have your GPS antenna hooked up to the correct U.FL port?

Can you see the output of the sample in your serial console? (Is it actually running?)

Generally if you’re outside direct access to sky with no SUPL in my experience it takes 30-60 seconds.

rabarar

GPS antenna - connected to the top U.FL connect when the USB port is on the left …

Output runs successfully in the Serial Monitor

Outside w/Direct access to the sky - no fix in 300+ seconds

rabarar

Tracking:  1 Using:  0 Unhealthy: 0
-----------------------------------
Seconds since last fix: 304
Searching [|]

NMEA strings:

$GPGGA,000504.11,,,,,0,,99.99,,M,,M,,*67
$GPGLL,,,,,000504.11,V,N*4B
$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1*2D
$GPGSV,1,1,1,26,,,25,1*56

rabarar

As a point of comparison, using the nrf9151-DK it works - at the same exact location

jaredwolff

@rabarar can you email me your IMEI. A picture of the setup would be helpful as well.

jaredwolff

@rabarar also could be the antenna rather than the board. Do you have any other active U.FL antennas you can try?

jaredwolff

Can you also make sure that if you search your /gps/build/ directory that CONFIG_MODEM_ANTENNA_AT_COEX0 exists in your .config file? The .config file is a compilation of all your kconfig values.

I assume you didn’t hook up anything else to that port at any time?

rabarar

I replaced your antenna with a known working one and see that I can get a fix - the antenna that you shipped was defective…

jaredwolff

rabarar I replaced your antenna with a known working one and see that I can get a fix - the antenna that you shipped was defective…

Ok. I’ll get a return label and replacement to you ASAP. Same address as your order OK?

rabarar

Tracking: 11 Using:  4 Unhealthy: 0
Tracking: 12 Using:  4 Unhealthy: 0
Tracking: 11 Using:  4 Unhealthy: 0
Tracking:  9 Using:  4 Unhealthy: 0
Tracking:  9 Using:  4 Unhealthy: 0
Tracking: 10 Using:  4 Unhealthy: 0
Tracking: 10 Using:  5 Unhealthy: 0
Tracking: 10 Using:  6 Unhealthy: 0
-----------------------------------
Latitude:       XX.257819
Longitude:      -XX.879896
Altitude:       92.6 m
Accuracy:       3.1 m
Speed:          0.1 m/s
Speed accuracy: 0.5 m/s
Heading:        0.0 deg
Date:           2024-12-02
Time (UTC):     22:23:02.071
PDOP:           3.5
HDOP:           1.7
VDOP:           3.0
TDOP:           2.5

NMEA strings:
...

rabarar

@jaredwolff as a suggestion it might be better to just ship a case with U.FL-SMA female connectors. I drilled a hole in your case, threw one on and used that with a better antenna … I’ll send you a pic if you’re curious to see it! 🙂

rabarar

jaredwolff

jaredwolff no rush, same address works fine