Garmin Gtx330 and 330D series are ADSB ready for G.A Aircraft ,In Australia they must be coupled to a TSO145A GPS or a 146A GPS engine ,not sure about Europe/USA. Collins make a remote mount transponder for medium to large Aircraft and large Helicopters ,S76 for example.The model number Is a TDR94 It Has an ADSB option and again needs to be coupled to a TSO 145A GPS or 146A engine.
The Garmin 400W/500W range of GPS recievers are TSO 145A aproved and are designed to be fully coupled with the GTX 330 , you can download the Install manual on the 330 Its a very clever bit of gear.The TDR 94 Is expensive aprox 25 grand US. the garmin 330 around 4-5 grand US at a guess. Hope this helps ?