so if i am understanding this correctly than a (little dense sometimes ) mod =FM 6 channel 6yg and my 6exas mod = PCM or FM 6 channel should Work if using FM ??? how do you select FM if you don"t turn it on as student [:@]

their notes
** Stands for all possible combinations. For example, 6EX** means 6EXA, 6EXH, 6EXAS, etc.

(1) For the 6X and 7U series radios, the student radio must be in the same modulation as the master radio. A 4ch FM system cannot be used as the student with a 6X or 7U if either is in PCM.