Joe Pires;n1137844 said:
Actually my question includes that I am flying in airspace that requires a Mod C Transponder.
So I meant to ask if it was not clear on how to become fully compliant.
Transponders come in 4 basic flavors.
Mode A ... Squawk and IDENT.
Mode C ... Mode A Plus Altitude.
Mode S ... Mode C Plus TCAS Collision Info, ICAO Code.
Mode ES ... Mode S Plus ADS-B (Extended Squitter)
Modes C, S, and ES all meet the requirements of Mode C.
You can't buy a new Mode A Transponder anymore, so any Transponder will meet the Basic Mode C requirements for Class B airspace today.
The ADS-B OUT function is an extension of the TCAS Collision avoidance system.
To meet the minimum ADSB requirements you will need to transmit basic Mode C plus UAT ADS-B out Data ... Or Mode ES which incorporates the ADS-B Out Data.
The Mode C or ES transmission is the beacon that allows other aircraft to see your location.
You are not required to receive the ADS-B data but without it, you will be blind in seeing approaching traffic or weather.
Mode C or better will allow Airliner TCAS systems to alert the pilots to your presence.
Basic mode C will only inform a TCAS equipped aircraft that you are within a specified mile range.
Your Altitude will be known but your direction will not. "Traffic 2 miles, 5700 ft."
The distance is based on how strong a signal is received Air-to-Air, so it is not very accurate.
2 miles could be anything between 1 and 4 miles.
ADS-B will allow everyone to know what everyone else is doing in great detail.
"Propeller Traffic, 11 o'Clock, 2 miles, SouthWestBound, Descend through 5700 ft. at 70 kts."