erratic Skyview behavior

[johnsteichen]

I went flying today with my Skyview. It has been functioning perfectly. I wanted to test out a new nav antenna on an ILS. The attitude airspeed functions functioned normally. I was feeding the HSI thru a 429 converter with a Garmin 430W. It was a hot day and the Skyview was HOT to the hand placed on the screen.
Some of the observed behaviors were as follows:
GPS 1 course pointer kept blinking on for a few seconds, then off. No deviation needle ever became evident.
Same behavior when NAVSRC was set to Nav.
In flight, I rebooted the entire system and the 430w a couple of times.
Behavior continued as described.
I do have a back up battery, and experienced problems in flight, turning the unit off. in order to reboot the skyview.

On Landing, and after shutdown, I waited maybe 10 min, and then tried the whole setup again. Worked perfectly in ground tests.

It seemed like the information from the 430 was erratic both NAV and GPS
Is it possible that the skyview was overheating, or the ARINC 429. Never had a heat problem with the 430. It is fan cooled.

 

[dynonsupport]

We haven't seen any evidence of any overheating problems with SkyView, and hot to the touch is often well within acceptable limits. If you're able to get a datalog off of SkyView after a flight where this happens, that would help us see what you're seeing.

 

[johnsteichen]

I think I solved the problem. Have to test yet. I use an EXP bus for handling power in my glastar. I was pulling power out of a 3 amp terminal and going into a 5 amp circuit breaker. the unit uses polyswitch PTC current limiters. I was getting some sort of cyclic current interuptiion complicated by the backup battery jumping in and out. I might have been drawing more than the 3 amp current limitation of the polyswitch. I think it had the skyview very confused. The polyswitch would reset it self, and some sort of a cycle was created. I changed the source of power going to a single panel mounted 5 amp C/B. Basically I removed the PTC current limiter out of the equation.

 

[johnsteichen]

Unit now works perfectly. Nothing to do with the dynon skyview. ( of course )
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