C182Q INSTRUCTOR PLT BLUNDERS INTO R2984 AIRSPACE WHILE DISTRACTED WITH COM FAILURE.

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MY FRIEND; A PVT PLT; AND I TOOK OFF FROM 44J AT XA30. HE WAS PILOTING; BUT NOT CURRENT. WE HEADED E TO THE OCEAN THEN S ALONG THE SHORELINE. SHORTLY INTO THE FLT WE REALIZED WE HAD A PROB WITH COMS. OUR RADIO FAILURE CAUSED US TO DIVERT OUR ATTN FROM THE FLT PATH AND WE PENETRATED R2934 WHICH WAS HOT. WE MADE 3 ORBITS ATTEMPTING TO FIX OUR PROB WITH NO SUCCESS AND TOOK UP A HEADING FOR 44J. AT THAT TIME; AN FAA ACFT APPEARED OFF OUR R WING. I TRIED AGAIN TO COMMUNICATE BY RADIO; BUT NO SUCCESS. WE LANDED AT 44J AND THE FAA PLANE FOLLOWED US WHERE WE WERE INTERVIEWED BY THE INSPECTOR AND NOTIFIED OF OUR INCURSION. WE HAD BEEN SO INVOLVED IN OUR RADIO PROB THAT IT CAUSED OUR ATTN TO DIVERT FROM POS AWARENESS. FAMILIARITY WITH THE AREA ALSO; PROBABLY; ALLOWED SOME ELEMENT OF COMPLACENCY TO CREEP INTO OUR THOUGHTS. WE WERE JUST OUT FOR A SHORT FLT TO EXERCISE THE AIRPLANE AND ALLOW MY FRIEND TO ENJOY A PILOTING EXPERIENCE. IT WAS A VERY HUMBLING EXPERIENCE AND AN EMBARRASSMENT TO ME TO HAVE AN FAA INSPECTOR POINT OUT MY TRANSGRESSION. POS AWARENESS IS EXTREMELY IMPORTANT.