PLT OF SMA HAS VHF COM PROB IN TFC PATTERN AT MTN.

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I WAS CLRED FOR TKOF ON RWY 15. I ADVISED TWR THAT I WOULD BE MAKING L-HAND PATTERN FOR SEVERAL TOUCH AND GOES. PRIOR TO TURNING L FOR A XWIND LEG I THOUGHT TWR WAS TRYING TO CONTACT ME BUT THEIR XMISSION WAS GARBLED -- POSSIBLY STEPPED ON BY ANOTHER ACFT. SEVERAL TIMES I REQUESTED 'SAY AGAIN.' TWR CONVERSATION STILL NOT UNDERSTANDABLE. (MY NON-PLT PAX COMMENTED ON THIS.) I WAS CLRED FOR A TOUCH AND GO ON RWY 15; RESPONDED; MADE THE LNDG AND TOOK OFF. WHILE ON THE XWIND LEG IT OCCURRED TO ME THAT THERE WAS A RADIO PROB. THE TWR KEPT CALLING ME BUT DID NOT RESPOND TO MY XMISSIONS. WHILE ON THE L DOWNWIND LEG I SWITCHED MIKES AND ATTEMPTED TO TALK TO THE TWR AGAIN. WHEN I PRESSED THE XMIT BUTTON I COULD HEAR THE CLICK IN MY HEADPHONES AND THE LETTER 'T' LIT ON THE FACE OF THE RADIO PANEL. I CHKED THE CIRCUIT BREAKERS BUT NONE HAD POPPED. I NO LONGER HEARD THE TWR AND THE INTERCOM (WHICH IS PART OF THE COM RADIO SYS) BTWN MYSELF AND MY PAX WAS ALSO INOP. WHILE ON THE SECOND FINAL APCH; I NOTICED ANOTHER ACFT ON THE RWY AND WENT AROUND. IT OCCURRED TO ME TO SWITCH MY XPONDER TO 7700 BUT BECAUSE OF MY ASSIGNED ADIZ SQUAWK I DEFERRED THAT ACTION TO NEGATE THE POSSIBILITY OF SCRAMBLING THE WAR MACHINE AND BEING SHOT DOWN BY FRIENDLY A10'S AT THE ARPT WHERE I'VE BEEN RENTING HANGARS FOR MORE THAN 20 YRS. ON MY THIRD FINAL APCH I LANDED AND SLOWLY TAXIED TO A POS IN FRONT OF THE TWR; OPENED THE CANOPY AND WITH HAND SIGNALS INDICATED TO THE TWR THAT MY RADIO WAS INOP; SHUT DOWN; DEPLANED AND WHILE WALKING TOWARD THE BUILDING WAS INTERCEPTED BY A GENTLEMAN WHO ADVISED ME THAT THE TWR WISHED TO TALK TO ME. THIS I DID FROM INSIDE THE FBO. I BELIEVE THAT; CONSIDERING THE CIRCUMSTANCES; MY ACTIONS WERE REASONABLE; PRUDENT; PROPER AND SAFE.