GRUMMAN AA1 PVT PLT ACCUSED OF A RWY INCURSION BY LCL CTLR IN A CLRNC DISPUTED SIT AT CMA.

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CMA CTL TWR CLAIMS THAT I DEVIATED FROM A HOLD SHORT INSTRUCTION BY ROLLING OVER A HOLD SHORT BAR. I BELIEVE THERE MIGHT HAVE BEEN A SIMILAR CALL SIGN ON FREQ. I HAVE BEEN BASED AT VNY FOR OVER 12 YRS AND I AM TRAINED TO LISTEN VERY CAREFULLY TO THE CTLRS. VAN NUYS IS THE BUSIEST GA ARPT IN THE WORLD AND I AM VERY ACCUSTOMED TO HIGH TFC AREAS AND FAST RADIO COMS. IN THIS OCCURRENCE I THOUGHT I WAS GIVEN A TKOF CLRNC SO I PROCEEDED PAST THE HOLD SHORT BARS. AS PIC I TOOK THE ACTION TO STOP MY ACFT CLR OF THE ACTIVE RWY JUST PAST THE HOLD SHORT BARS AS I OBSERVED TFC ON CLOSE FINAL; EVEN THOUGH I WAS GIVEN A CLRNC BY ATC. I HAVE HAD SIMILAR PROBS IN THE PAST AT CAMARILLO ARPT SUCH AS PLANE SPACING PROBS AND UNREADABLE CTLRS WHO OFTEN GET CALL SIGNS MIXED UP. I WILL USE THIS AS A LEARNING EXPERIENCE TO PAY GREATER ATTN IN SITS SUCH AS THIS. THIS IS WHAT I RECALL ON THE RADIO 'AFTER COMPLETING MY PRE-TKOF CHK AND RUN-UP.' CMA GND: GRUMMAN ABL CAN YOU SAY YOUR COMPLETE CALL SIGN? ME: CAMARILLO GND; GRUMMAN ABBLL. CMA GND: THANK YOU GRUMMAN ABBLL. BEACH BONANZA Y CAMARILLO GND; BONANZA Y WE DO NOT NEED THE RUN-UP AREA; REQUEST TAXI TO RWY 26. BONANZA COMING FROM MY R TO THE RUN-UP AREA. CMA GND: GRUMMAN ABL ARE YOU READY TO TAXI TO RWY 26? ABBLL: YES WE ARE READY TO TAXI TO RWY 26 GRUMMAN ABL. CMA GND: ABL TAXI TO RWY 26 AND CONTACT TWR; HAVE A GOOD FLT. TAXI TO RWY 26 AND CONTACT THE TWR THANK YOU; GRUMMAN ABBLL. ABBLL: CAMARILLO TWR THIS IS GRUMMAN HOLDING SHORT OF RWY 26 AT TXWY B READY FOR TKOF; WE WOULD LIKE A R DOWNWIND DEP. CMA TWR: UNREADABLE. ABBLL: PLEASE REPEAT GRUMMAN ABL. CMA TWR: GRUMMAN ABL; POSITI (STATIC STATIC) 26. ME: DID YOU SAY TAXI INTO POS GRUMMAN ABL? CMA TWR: NO HOLD SHORT OF RWY 26. HOLD SHORT OF RWY 26 AND CAN WE MAKE THAT A L DOWNWIND DEP GRUMMAN ABL. CMA TWR L DOWNWIND APPROVED HOLD SHORT OF RWY 26. ABBLL: HOLD SHORT OF RWY 26; ABL. CMA TWR: ABL CLR FOR TKOF; NO DELAY; TFC ON SHORT FINAL. ABLL: CLR FOR TKOF ON RWY 26 TFC ON SHORT FINAL. AT THIS MOMENT I LOOKED TO MY UPPER R TO CHK FOR LNDG TFC AND OBSERVED A C172 ON SHORT FINAL SO I STOPPED THE PLANE JUST AS I CROSSED OVER THE HOLD SHORT LINE. I WAS STOPPING THE PLANE CLR OF THE ACTIVE RWY JUST OVER THE HOLD SHORT LINE WHEN THE TWR CALLED. CMA TWR: 'GRUMMAN STOP; STOP YOU ARE NOT CLRED FOR TKOF.' ABBLL: GRUMMAN HOLDING SHORT OF RWY 26. CMA TWR: CESSNA Z GO AROUND. CESSNA Z: CAMARILLO TWR CAN WE STILL LAND? TFC IS NOT A FACTOR. CMA TWR: NEGATIVE CESSNA Z I CANNOT LEGALLY LET YOU LAND; A PLANE HAS CROSSED OVER THE HOLD SHORT LINE. OTHER RADIO CHATTER THAT I DO NOT RECALL OTHER C172 GOES AROUND. BONANZA Y: CAMARILLO TWR BONANZA XXYY; WE HEARD YOU GIVE HIM A TKOF CLRNC. CMA TWR: I WOULD NEVER GIVE A CLRNC WHEN THERE WAS TFC ON SHORT FINAL. BONANZA Y: WE HEARD YOU GIVE HIM A CLRNC. I SUGGEST YOU REVIEW YOUR TAPE. OTHER RADIO CHATTER THAT I DO NOT RECALL. CMA TWR: GRUMMAN ABL TAXI INTO POS AND HOLD. ME: TAXI INTO POS AND HOLD GRUMMAN ABL. I TAXI IN POS ON RWY 26. CMA TWR: GRUMMAN ABL CLRED FOR TKOF. ME: CAMARILLO TWR; ARE WE CLRED FOR TKOF? CMA TWR: GRUMMAN ABL; CLRED FOR TKOF.