pecanflyboy
Well Known Member
Howdy,
I purchased a new GTN650 in January, 2019 and swapped out my GNS480. The unit worked well until the fall when I began experiencing excessive time to acquire 3D position. It seemed the colder the temperature and the longer the airplane had been unpowered, the longer the acquisition time. I spent a lot of time troubleshooting with Garmin. I finally received and "Internal battery low" message and Garmin swapped the GTN650 with a reconditioned unit. Initially, I had the same battery warning with the new unit, but it eventually went away (left over from the previous unit, or the increase in temperatures gave the battery new life?). I'm still having excessive initial 3D position acquisition. Here is a typical scenario (I'm still working with Garmin).
Before taking the aircraft out of the hangar, I checked the GTN650 position and UTC time in the configuration mode. It appeared accurate, having flown the day before.
Placed the aircraft with a clear view of the sky. G3X system found 3D position within 30 seconds. GTN650 had no satellites and no position. Turned everything off, pulled circuit breakers on everything except the GTN 650, powered on and waited over 5 minutes with no satellites on the GPS system page. Powered down, pushed in all CB?s, powered on and waited.
After 5 minutes I finally received 3D position on the GTN650. Powered down, powered on???GTN 650 3D position in one minute. I repeated with same result. So, it seems that once the GTN650 finds an initial position it reacquires it quickly with a re-power. This tells me the integrity of the installation is good (antenna position, wiring, interference, etc).
The longer the airplane sits in the hangar, and the colder the temperature, the longer it takes to acquire its initial 3D position. It seems the unit either looses its current position and has to do a full ?initialization? position, or it is something related to a cold unit?
Yesterday, after the aircraft sat for over a week, with the temperature at 35F, I flew for 30 minutes with no 3D position on the GTN650. Took off less than an hour later, and finally got the 3D position after another 5 minutes.
Here is me:
? RV-6
? G3X (non-touch)
o GDU 370 (PFD)
o GDU 375 (MFD)
? GSU 73
? GTN 650 (Replaced GNS480)
? G5 (SPD) (CANBUS to G3X, Not connected to SL30)
? SL30
? GMA 340
? GTX 23ES
? GDL 39
? TruTrak GXPilot autopilot
GMC305
Any ideas?
Jimmy
I purchased a new GTN650 in January, 2019 and swapped out my GNS480. The unit worked well until the fall when I began experiencing excessive time to acquire 3D position. It seemed the colder the temperature and the longer the airplane had been unpowered, the longer the acquisition time. I spent a lot of time troubleshooting with Garmin. I finally received and "Internal battery low" message and Garmin swapped the GTN650 with a reconditioned unit. Initially, I had the same battery warning with the new unit, but it eventually went away (left over from the previous unit, or the increase in temperatures gave the battery new life?). I'm still having excessive initial 3D position acquisition. Here is a typical scenario (I'm still working with Garmin).
Before taking the aircraft out of the hangar, I checked the GTN650 position and UTC time in the configuration mode. It appeared accurate, having flown the day before.
Placed the aircraft with a clear view of the sky. G3X system found 3D position within 30 seconds. GTN650 had no satellites and no position. Turned everything off, pulled circuit breakers on everything except the GTN 650, powered on and waited over 5 minutes with no satellites on the GPS system page. Powered down, pushed in all CB?s, powered on and waited.
After 5 minutes I finally received 3D position on the GTN650. Powered down, powered on???GTN 650 3D position in one minute. I repeated with same result. So, it seems that once the GTN650 finds an initial position it reacquires it quickly with a re-power. This tells me the integrity of the installation is good (antenna position, wiring, interference, etc).
The longer the airplane sits in the hangar, and the colder the temperature, the longer it takes to acquire its initial 3D position. It seems the unit either looses its current position and has to do a full ?initialization? position, or it is something related to a cold unit?
Yesterday, after the aircraft sat for over a week, with the temperature at 35F, I flew for 30 minutes with no 3D position on the GTN650. Took off less than an hour later, and finally got the 3D position after another 5 minutes.
Here is me:
? RV-6
? G3X (non-touch)
o GDU 370 (PFD)
o GDU 375 (MFD)
? GSU 73
? GTN 650 (Replaced GNS480)
? G5 (SPD) (CANBUS to G3X, Not connected to SL30)
? SL30
? GMA 340
? GTX 23ES
? GDL 39
? TruTrak GXPilot autopilot
GMC305
Any ideas?
Jimmy