PLT OF A CORP SMT TURBOPROP OVERSHOT INITIAL CLB ALT IN A CLASS B AIRSPACE CLRNC DUE TO DISTR OF 1 OF THE 2 COM RADIO'S PROBS.

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AFTER RECEIVING A CLRNC TO DEPART CLASS B AIRSPACE TO THE W; I TOOK OFF AND TURNED R TO 240 DEG HDG AND CONTINUED MY CLB. I HAD BEEN CLRED TO 7000 FT AND PRIOR TO REACHING MY ALT; I TRIED TO CALL DEN DEP 5 TIMES UNSUCCESSFULLY DUE TO RADIO CONGESTION. INITIALLY I THOUGHT THE PROB MAY HAVE BEEN MY RADIOS SO I TRIED A DIFFERENT RADIO AND ASKED 'DEN DEP; HOW DO YOU HEAR THIS RADIO?' THEY THEN ANSWERED 'LOUD AND CLR YOU ARE RADAR CONTACT SAY ALT.' I RESPONDED MY ALT WHICH AT THE TIME MAY HAVE BEEN 8500 FT AND CLBING. DEN DEP RESPONDED WITH A 'ROGER.' AS I CLBED THROUGH 12000 FT; DEN DEP CAME BACK AND ASKED; 'SAY ALT YOU WERE CLRED TO.' AT THAT POINT I REALIZED I HAD ONLY BEEN CLRED TO 7000 FT. I RESPONDED BY SAYING; 'I BELIEVE I WAS CLRED TO 7000 FT; I'M SORRY I BLEW MY ALT.' DEN DEP'S RESPONSE WAS; 'IT LOOKS LIKE YOU'RE ON TOP OF EVERYTHING NOW ANYWAYS; SO FREQ CHANGE IS APPROVED AND SQUAWK VFR; GOOD DAY.' IN MY OPINION; I BELIEVE THAT THE PRIMARY CAUSE FOR VIOLATING AIRSPACE WAS MY INATTN TO MY ALT IN MY CLRNC. I THOUGHT I HAD BEEN CLRED TO CLB UNRESTR. CONTRIBUTING FACTORS WERE THAT THEY WERE NOT ANSWERING MY RADIO CALLS INITIALLY; DISTRACTING ME FROM MY CLRNC TO DEAL WITH MY COMS.