Originally Posted by ka6dan
When the problem is sorted out, please post the answer of VAF. As you may recall, I'm having very similar problems. At this time I'm going to pull the unit out from under the instrument panel and see if my GDL39 will function in a cooler environment. Not that there's much of cooler this time of year in Florida.
With all due respect to those that are truly trying to be helpful, this is exactly why crowd sourced customer support has limited value. We know almost nothing about what issue may or may not be present in the original posters system, someone makes a posting speculating a temperature issue, and now you are saying you are going to be pulling your unit out from under the instrument panel to find a cooler location!
For every product we design, we take into account the operating environment as part of designing and testing the product. The GDL39 is black, not because we wanted to make a product that sits in the sun on the glare shield black, but because it needed to be a dark color so it doesn't reflect into the windshield and impair visibility.
Knowing it was a black product needing to operate in the sun was taken into account when the product was environmentally tested during development at temperatures far in excess of your present mounting location. We environmentally test every product we develop at both cold and hot temperature extremes sufficient to know that the product will operate reliably for the customer. It isn't at all uncommon for the design of heat sinks and other packaging features to be altered during development when testing demonstrates that improvements might be necessary.
Having said this, we all know that allowing electronic products to bake in the sun isn't ideal for anything, and many of us avoid an installation of this type whenever possible.
As you know, we found that the software in your system and GDL39 was very old and out of date, and addressing that as well as discussing the differences between your TIS-A and ADS-B traffic sources was the first step in making sure that your GDL39 is working as well as it should be in your plane.
These are complex systems and we work with every customer who contacts us on an individual basis to make sure that hardware and software is working as it should. The recent NOTAMS regarding ADS-B unreliability at various locations in the U.S. doesn't make this any easier!