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javamandk
javamandk's picture
Getting no GPS signal / cords from OVMS

Hi

I have just setup and installed my OVMS and everything went fine.

But I do not get any GPS location data from the device on the server / app.

I have tryed to remove the antenna and putting it on again.

Is there somewhere I can se if the GPS is working or what the problem could be.

Thanks, Javaman (Kia E-Niro)

No GPS

dexter
dexter's picture
Getting no GPS signal / cords from OVMS
  1. Check if GPS is enabled in the modem configuration (Config → Modem)
  2. Check if you have an active (powered) GPS antenna (needs to have a voltage range 3-5 V on the label)
  3. Check if you've got a voltage on the antenna port
  4. Check if the internal modem PCB pigtail connection to the GPS antenna port is OK

You can enable verbose logging on "gsm-nmea" to see the NMEA sentences in the log / shell.

If they look like this, the modem has no GPS signal:

V (408301) gsm-nmea: IncomingLine: $GNGNS,131702.0,,,,,NN,,,,,,*4B
V (408311) gsm-nmea: IncomingLine: $GPRMC,,V,,,,,,,,,,N*53

Regards,
Michael

javamandk
javamandk's picture
Hi

Hi

Thanks for the quick reply, the GPS is active in the config, and I get this in the log:

V (82910313) gsm-nmea: IncomingLine: $GNGNS,,,,,,NN,,,,,,*53

V (83132323) gsm-nmea: IncomingLine: $GPRMC,,V,,,,,,,,,,N*53

I don't know how to check 2 and 3..

dexter
dexter's picture
Getting no GPS signal / cords from OVMS

Which antenna do you use?

javamandk
javamandk's picture
Hi, The one from (https:/

Hi, The one from (https://shop.openenergymonitor.com/ovms/)

dexter
dexter's picture
Getting no GPS signal / cords from OVMS

That's the standard GPS antenna (active) and should work. You possibly have a hardware issue. The most typical source for this is the pigtail cable.

If you can't check the antenna and don't know how to check the voltage & pigtail cable, you'll need to send the kit back to OpenEnergyMonitor for a test / repairing / replacement.

Contact Glen for details.

Regards,
Michael

javamandk
javamandk's picture
Hi

No voltage from the gps

and the antenna cable is ok

dexter
dexter's picture
Getting no GPS signal / cords from OVMS

You should see ~ 4V there. As your modem is working, the next thing to check would be the pigtail cable.

Open the module, trace the cable from the GPS socket to the modem PCB. Check if it's connected tightly on the PCB socket. Try disconnecting and reconnecting. Test if the cable is broken.

javamandk
javamandk's picture
No problems with the cable

No problems with the cable from the print to the connector.

so the problem must be in the printboard.

I have created a support case with reference to this thread.

Can you help me how to get a new that works?

Best 

Allan

dexter
dexter's picture
As you bought the module from

As you bought the module from Glen, you should contact him first. Send him the link to your support case.

Regards,
Michael

markwj
markwj's picture
One comment on testing

One comment on testing antenna connections, is that the following tests can be done with a mulitmeter:

  1. Disconnect all cables from the module. No power. No external antennas.
  2. With a multimeter, test the GPS cable connector on the side of the module for resistance between centre pin and screw terminal. You should see around 900 ohms.
  3. With a mulitmeter, test the GSM cable connector on the side of the module for capacitance between centre pin and screw terminal You should see around 125 uF.
  4. If either are more than 25% off from those values, then disconnect the internal antenna cables and repeat the test using the antenna connectors on the modem board itself.
  5. If ok using internal connectors, but bad using external connectors, then try re-seating the internal antenna cables where they plug into the modem board. You can do this while measuring resistance / capacitance, to see if the problem is a loose connection.
  6. The above should help you identify if the internal cable is damaged/faulty, or the modem itself.

Regards, Mark.

javamandk
javamandk's picture
Thanks

Thanks for all the help, I have returned the OVMS Unit and GPS antenna. Hope to get a new soon :)

Regards, Allan

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