RE: Graupner 2.4
I have been flying with the XPS system for about a year. I have it installed in six jets. I have had no issues in the countless flights made.
I make sure the Rx is mounted well away from any wiring & any loose wiring that could come near the Rx is secured.
Graupner are the European agents for XPS. As far as I know they only sell the product & have no connection with its production.