Loss of GPS - Power or Signal?

[#74430]

Hi all,

I have an intermittent issue whereby I lose position data from the GPS-2020. I can't tell if it's a signal data issue or power to the module issue. Maybe the following info will help.

CAUTION:
POSITION SOURCE 1 FAIL
NO ADS-B OUT: GPS LOST

ON MAP:
POSITION UNKNOWN
TRAFFIC FAIL

2 x HDX - Data drops to both at the same time. GPS 2020 remains listed in SERIAL 5 but data transfer is static. There doesn't seem to be any consistent reason for loss. Sometimes it's on the ground, other times in the air after take-off or 45 minutes into flight. Not convinced it's heat related.

GPS Module is mounted on the top of the fuse behind the canopy (RV-7A).

I know I must be a wiring issue but if I can narrow it down to either signal or power that would be helpful. Would the module still display in the system if power is lost?

Cheers,

Dan
Melbourne - Australia

 

[GT3]

I'm experiencing a very similar issue, I checked the GPS Fix Status on my MFD while I was having an issue on the PFD and signal seemed fine.
Have you found anything?

 

[#74430]

Yeah I replaced the wiring harness in the avionics bay where the 4 wires split on their way to the 2 x HDX screens... No fix. Ended up being a faulty 4 pin connector tin the tail near the GPS module.

 

[GT3]

Understood. Thank you!

 

[mikelupo]

Hi all,

I have an intermittent issue whereby I lose position data from the GPS-2020. I can't tell if it's a signal data issue or power to the module issue. Maybe the following info will help.

CAUTION:
POSITION SOURCE 1 FAIL
NO ADS-B OUT: GPS LOST

ON MAP:
POSITION UNKNOWN
TRAFFIC FAIL

2 x HDX - Data drops to both at the same time. GPS 2020 remains listed in SERIAL 5 but data transfer is static. There doesn't seem to be any consistent reason for loss. Sometimes it's on the ground, other times in the air after take-off or 45 minutes into flight. Not convinced it's heat related.

GPS Module is mounted on the top of the fuse behind the canopy (RV-7A).

I know I must be a wiring issue but if I can narrow it down to either signal or power that would be helpful. Would the module still display in the system if power is lost?

Cheers,

Dan
Melbourne - Australia

I am having this same problem. It started in April and happens now intermittently during every flight. Also, a new thing I noticed is that Augmented Reality screen started showing me at ground level (all Red) although I was at least 4 thousand feet above any terrain. I don't know if that's a part of the same issue or if it's a new emerging issue.
I used Raychem solder sleeves to split the harness to each HDX screen. I am wondering if that was a bad choice for butt splices?