SMA HAS STUCK MIKE PROBLEM AND POSSIBLE ENTRY INTO TCA.

Narrative

I DEPARTED ORANGE COUNTY ARPT FOR TRENTON-ROBINSVILLE ARPT VIA SPARTA VOR AND SOLBERG VOR AT 3000 FT. EARLY THAT MORNING I CALLED FLT SVC FOR AN ENRTE WX BRIEFING AND WAS NOT TOLD THE SPARTA VOR WOULD BE OUT AFTER XX00 ZULU. WHILE IN THE AIR I TRIED TO RECALCULATE MY RADIAL TO AVOID THE NY TCA SINCE THE SPARTA VOR WAS OUT. I ALSO TRIED TO CONTACT NY APCH CTL FOR TA BUT WAS ONLY ABLE TO GIVE MY CALL SIGN BRIEFLY DUE TO AN INTERMITTENTLY STUCK MIKE SWITCH WHICH I WAS NOT AWARE OF AT THE TIME. DUE TO THESE DISTRS I INADVERTENTLY FORGOT TO SWITCH MY TRANSPONDER TO MODE 'C' PRIOR TO ENTERING THE TCA VEIL FOR NYC. I MAY HAVE ENTERED THE EDGE OF THE TCA AT 3000 FT BUT DO NOT BELIEVE I DID. THERE MAY ALSO HAVE BEEN A POSSIBLE TFC CONFLICT. I BELIEVE I NEED TO FLY MORE IN A TCA ENVIRONMENT SO THAT PROPER PROCS ARE SECOND NATURE TO ME. I ALSO NEED TO FLY MORE LOCALLY PERHAPS SO ANY RADIO PROBLEMS SUCH AS A STICKING MIKE SWITCH WILL SHOW UP AT A LESS CRITICAL TIME. I ALSO NEED TO SPECIFICALLY ASK THE FSS FOR ANY NOTAMS ON FUTURE BRIEFINGS.