HI Joe123s,

We have had some testing going on here the last few days on the problem that you are seeing with the 7C and various student radios.

Some very old units, made before 1997 are just not compatible with current technology. The 7C will work fine with any Futaba radio made after 1997, there is no need for any modifications to the 7C. If you do not have another transmitter to use as a student other than the Conquest, you can send the Conquest into our service center and we can modify this so that it will work with your 7C for you.

Thanks, Krysta