The Esprit IV instructions are very explicit, the receiver should be elevated from the chassis, especially if it is carbon fibre, the antenna should not contact the chassis, despite being a screened construction, be fully deployed vertically and positioned away from noise sources!
I must admit I was very surprised when I had my Esprit IV that the receiver should be so sensitive to installation and having believed that 2.4ghz were less prone to interference than the old 40 and 27mhz systems. I have never had any problems previously with Futaba 2.4ghz installations!
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