Discussions

No GPS Fix?

Posted by Fred LeFevre on July 27, 2014 at 10:50am

Well this seems odd to me and no idea what to do.

I have 3DR Quad about a year old - I haven't been able to do anything with it for awhile and just getting back to it now. APM 2.6. I have a new receiver and Taranis FRSKY radio so getting everything hooked up.

I know gps was working in March because I did work on the copter for a bit and tested it then but didn't get any further.

There is power to GPS (Solid Red Light) but no lock showing on GPS. I am getting flashing blue light so looks like GPS is powered up properly. I tried loading the latest firmware 3.5.1 but that has not helped.

Not sure where to go from here so any idea would be quite welcome.

Thanks,

Fred

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Replies

Jake July 28, 2014 at 5:05pm

before you replace the gps - check your gps wires for continuity, check the antenna connection- ive had wires break and the gps antenna connection come loose
- Fred LeFevre > Jake July 28, 2014 at 5:27pm
  
  Ok thanks for the tip - I'll give that a go.
  
  Fred
Gerard Toonstra July 27, 2014 at 12:35pm

How long did you wait for the lock? Did you move inbetween? It may take up to 30 minutes if it needs to download the ephemeris / almanac info. If it's longer than 30 minutes you're probably not getting a good gps signal (faulty antenna?). You should also check after power-off if it takes the same amount of time or only about a minute or so. Most GPS's save the info into EEPROM so it boots up faster next time. Hot-starts even have a battery to enable start-ups under a second.
- Fred LeFevre > Gerard Toonstra July 27, 2014 at 5:26pm
  
  Thanks for the reply- this is taoglas model. I believe it has an internal antenna. I never had a problem getting a fairly quick lock before. But I am in quite a bit different part of the country now. I feel pretty sure it was longer than 30 minutes but I may have moved or restarted in between. I've been out for part of the day so going to give it another go now.
  
  Thanks,
  
  Fred
  - Fred LeFevre > Fred LeFevre July 27, 2014 at 5:50pm
    
    Also in Mission Planner it shows Sats as 0 - so I don't think it is downloading anything.
    - Gerard Toonstra > Fred LeFevre July 27, 2014 at 5:55pm
      
      Sounds like it's got a problem when it stays that way. Usually you get a 2D fix within a couple of minutes at least. Just final confirmation as it wasn't stated: you test outside, right?
      - Fred LeFevre > Gerard Toonstra July 27, 2014 at 6:00pm
        
        I did test outside. so the only option you think is to replace the gps module?
        
        Thanks
        
        Gerard Toonstra > Fred LeFevre July 27, 2014 at 6:14pm
        
        If you're not getting any satellite ever outside, it sounds broken to me. unless someone else has another idea on this forum...
Fred LeFevre July 27, 2014 at 10:50am

Oh - also tried powering up from both USB and Battery - same results

This reply was deleted.

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