Mr Chimbu
I apologise, your advice does not clarify for me.
I understand TCAS is a very expensive item fitted to big aircraft.
My knowledge of PCAD / TCAD is limited but I understood they were cheap unsophisticated items that did not have TCAS capability.
I believe most require a radar pulse to work -
ATC ground stations and active TCAS systems transmit interrogation pulses on an uplink frequency of 1030 Megahertz. Aircraft transponders reply on a downlink frequency of 1090 Megahertz. PCAS devices detect these transponder responses, then analyze and display conflict information.
It is for this reson I ask your advice to determine if new TCAD as has your firend are more capable than the past ones. It also then relates to what i have thought about ADS-B being superlative as not needing MSSR pulses to trigger target advice.