Are you using the special Delphi headphone with the built=in antenna? There is NO antenna built into the SkyFi3 like the MyFi - you must have the special headphones with the antenna built in. okay?
Its likely that its internal battery is dead. I don't know if the repair guy at TSS Radio can fix that or not, but it is worth reaching out. You can contact him at: [email protected]
i think your Delphi should be broken. you can return to the factory or you can ask the 24 hrs live technical support at this site http://www.diyobd2.fr, they will like to help you, good luck