I have successfully connected my Bendix King SkyMap IIIC to my Funke TRT800 transponder using a short length of screened cable setting the GPS output & the transponder input to 4800bd. With my local LAA inspector I carried out the checks using a Pilotaware unit to confirm the SIL & SDA were set to 0. I am using software ver. 5.2 on the transponder. I sent the Mod form off to the LAA on Monday & received the permission back today (Saturday). I fly a Eurostar G-CCEJ.
We did a flight from Bagby last Sunday to Skegness which was tracked all the way there & back on FlightRadar24.