CITATION 550 BRAVO FLT CREW HAS A TRACK/HEADING DEVIATION DURING THE TEB 5 DEP.

Narrative

WE WERE ASSIGNED TEB 5 DEP EXPECTING A TRANSITION TO WHITE INTXN VIA CYN. AT 1500 FT WE WERE INSTRUCTED TO INTERCEPT RADIAL 350 DEGS TO OUR FIX. AT THE SAME TIME WE WERE HAVING DIFFICULTIES TRANSMITTING AND RECEIVING ON OUR BOTH RADIOS WHICH MADE ATC INSTRUCTIONS HARD TO UNDERSTAND. I WAS BUSY COMMUNICATING WITH THE ATC TO CLARIFY THE INSTRUCTIONS WHILE MY PIC TRIED TO INTERCEPT THE ASSIGNED RADIAL. ABOUT A MINUTE LATER THE ATC QUESTIONED OUR PRESENT HEADING WHICH AT THAT TIME WAS 150 DEGS. THE ATC IMMEDIATELY ASSIGNED US A NEW HEADING OF 280 DEGS AND SAID THE WE ARE TO INTERCEPT THE 350 RADIAL DEGS OFF CYN. PRIOR TO OUR DEP WE REVIEWED THE DEP PROC; TUNED ON THE PROPER NAV FREQUENCIES AND SET OUR CDIS TO THE APPROPRIATE RADIAL FOR THE ANTICIPATED INTERCEPTION. THE CHKLIST WAS COMPLETE. WE WERE BOTH USING THE SAME NAV FMS FOR DEP. HOWEVER; BECAUSE OF THE RADIOS NOT BEING SO CLEAR AND I TRYING TO ASK FOR CLARIFICATIONS; BOTH I AND THE PIC FORGOT TO TRANSFER CYN FREQUENCY TO THE USE SIDE ON OUR NAV RADIOS WHICH WERE SET TO TEB VOR TO IDENTIFY THE 4.5 DME FROM TEB AT 1500 FT. THINK HAD WE SET AT LEAST ONE THE NAVS AND CDI; ON SIC SIDE; TO THE CYN NAV PRIOR TO DEP WE WOULD HAVE ELIMINATED THE CONFUSION AND TURNING TO 150 DEGS INSTEAD OF 280 DEGS.