Good - Blue plugs that means you have the current airtronics plugs and they are compatable with all the other top four Rx's however thats only the plug issue. Agine that has nothing to do modulation shift.

How do know if a certain Tx or Rx will be compatable. The answer is simple you ask but an answer is impossible if you do not post the exact brand and model of both the Rx and the Tx you wish to try.

By factory default Hitec and Futaba use negative shift, JR and Airtronics use positive shift Howeverthere are many various brands and models of Tx as there are Rx's that are -Selectable shiftor-Auto shift Thats makes litterally hundreds of possible combinations that may OR may not work. Its like pulling teeth you need to state the exact make and model of both the Tx and rx you want to use.

Things such as this make piecing a system together from freebies and the bay a nightmare and unless you know exactly what you are doing folks who insist on 'Saving money' like this usually end up spending considerably more and end up with old setups usually not nearly as capable if they had bought a new entry level system.

John