A PA28 PLT WONDERS IF HE HAD REGALLY RECEIVED CLRNC ONTO RWY 21L AS HE BELIEVED AFTER THE CTLR CHASTISED HIM FOR AN 'UNAUTH RWY ENTRY' AT LUK; OH.

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I RECEIVED MY IFR CLRNC FROM CINCINNATI LUNKIN (LUK) CLRNC AT APPROX XA00. I READ BACK MY CLRNC INSTRUCTIONS. I THEN RECEIVED TAXI INSTRUCTIONS FROM LUK GND. I WAS TOLD TO 'TAXI TO RWY 21L AND HOLD SHORT RWY 21R.' I READ BACK 'TAXI TO RWY 21L AND HOLD SHORT RWY 21R.' AFTER HOLDING FOR A LNDG ACFT; I WAS INSTRUCTED TO 'CROSS RWY 21R.' I READ BACK THIS INSTRUCTION AND PROCEEDED TO THE RUN-UP; I CALLED LUK TWR AND TOLD HIM I WAS READY FOR DEP; RWY 21L. LUK TWR CLRED ME TO DO SOMETHING. I DID NOT UNDERSTAND WHAT HE SAID AND ASKED HIM TO REPEAT HIS INSTRUCTION. HE THEN STATED TO 'HOLD SHORT RWY 21L.' I READ BACK 'HOLD SHORT RWY 21L AND TAXIED TO THE HOLD SHORT LINE OF RWY 21L;' WITH MY ACFT ON RWY 25. AT APPROX XA19; A LOW-WING ACFT LANDED; AND LUK TWR CLRED ME TO 'POSITION AND HOLD RWY 21L.' I READ BACK 'POSITION AND HOLD RWY 21L.' AFTER LOW WING ACFT CLRED THE RWY; THE LUK TWR TOLD ME TO 'CLR THE RWY AND HOLD SHORT OF RWY 21L.' HE THEN CHASTISED ME FOR ENTERING THE RWY. APPROX FOUR MINS LATER; A MEDIUM-SIZED BUSINESS JET LANDED. AFTER SITTING FOR ANOTHER THREE MINS AT THE HOLD SHORT LINE FOR RWY 21L; THE LUK TWR CLRED ME TO 'POSITION AND HOLD RWY 21L.' I READ BACK THIS INSTRUCTION AND TAXIED INTO POSITION ON RWY 21L. LUK TWR THEN CLRED ME FOR TAKE-OFF AND TOLD ME TO FLY RWY HEADING. IN ALL CASES; I READ BACK WHAT THE LUK TWR CTLR HOLD ME TO DO AND THEN DID WHAT THE LUK TWR CTLR TOLD ME TO DO. I FOUND THIS CTLR DIFFICULT TO UNDERSTAND AS THE XMISSION APPEARED TO ME A BIT GARBLED. I CLEARLY READ BACK ALL INSTRUCTIONS RECEIVED (IE NOT JUST THE 'HOLD SHORT' INSTRUCTIONS). I FELT THAT I ACTED IN ACCORDANCE WITH ALL INSTRUCTIONS (BOTH AS RECEIVED AND AS READ BACK). AT NO TIME DID THIS INCIDENT RESULT IN ANY ATC DELAY (OTHER THAN MINE) OR IN A HAZARDOUS SIT AT LUK. IN THE FUTURE; IF I HAVE ANY DIFFICULTY UNDERSTANDING A CTLR; I WILL READ BACK AND RECONFIRM EVERY INSTRUCTION GIVEN TO ME.