FLT CREW ALTDEV WHEN FO OF AN ARR G-150 ENTERS THE WRONG ALT IN THE ALT ALERTER AFTER XING CLARR INTXN AT 13000 FT ON FREQ WITH L30; NV.

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WE WERE INBOUND ON A STAR WITH A XING RESTR OF 13000 FT AT AN INTXN. ABOUT 2 MI PRIOR TO THE INTXN; THE CTLR CALLED AND SAID TO DSND TO 11000 FT AND NO SPD RESTR AT THE INTXN. I READ BACK WHAT I THOUGHT I HEARD; AND PUT THE ALT IN THE ALT ALERTER. ONCE WE WERE AT 11000 FT; THE CTLR ASKED US TO SAY ALT. I SAID 11000 FT. THEY GAVE ME A PHONE NUMBER TO CALL WHEN ON THE GND. THE CTLR TOLD ME THAT THEY TOLD ME TO MAINTAIN 13000 FT AND NO SPD RESTR. I TOLD THEM I READ BACK 11000 FT. THEY LISTENED TO THE TAPE AND TOLD ME I READ BACK 13000 FT AND NOT 11000 FT; WHICH I THOUGHT I HAD HEARD. THERE WERE NO SEPARATION ISSUES BECAUSE OF THE DSCNT TO 11000 FT. I REALLY DON'T KNOW WHAT TO SAY TO HELP PREVENT THIS IN THE FUTURE. I ACTUALLY BELIEVE I HEARD 11000 FT AND I BELIEVE I READ BACK 11000 FT. HOWEVER; I DID NOT; ACCORDING TO THE TAPES. WHAT BOTHERS ME THE MOST IS THAT I BELIEVE I DID EVERYTHING RIGHT AND YET I WAS WRONG. I CAN'T UNDERSTAND WHY I WOULD PUT IN AN ALT IN THE ALERTER THAT THE CTLRS DID NOT GIVE ME. I HAVE FLOWN THAT STAR MORE THAN 100 TIMES AND I KNEW THAT THE NEXT ALT WOULD BE 12000 FT THEN 10000 FT. WHEN I PUT 11000 FT IN THE ALERTER; I SAID TO MYSELF -- THAT SEEMS ODD BUT THE CTLRS TOLD US TO EXPECT A R TURN FOR A VISUAL APCH TO RWY 19R. I THOUGHT THEY MUST BE SLOW AND ARE TRYING TO GET US DOWN EARLY. THEREFORE; I DID NOT QUESTION WHAT I THOUGHT I HEARD. SUPPLEMENTAL INFO FROM ACN 606098: WE WERE APCHING LAS ON THE KEPEC 1 ARR. CTR INSTRUCTED US TO CROSS CLARR INTXN AT 13000 FT BUT DID NOT ISSUE THE NORMAL SPD RESTR OR TO DSND VIA THE KEPEC 1 ARR. OUTSIDE OF CLARR INTXN; WE WERE HANDED OFF TO LAS APCH CTL. PF WAS CHKING THE ATIS ON THE #1 COM FOR LNDG WINDS. PNF WAS WORKING APCH CTL ON THE #2 COM. PASSING CLARR INTXN; PNF DIALED 11000 FT INTO THE ALT ALERTER AND ADVISED THE PF '11000 FT NO SPD RESTRS.' AT 11000 FT; THE CTLR ASKED OUR ALT. PNF RESPONDED 11000 FT; AT WHICH TIME THE CTLR ADVISED US TO CALL THEM WHEN ON THE GND. THERE WAS NO LOSS OF SEPARATION WITH THIS INCIDENT OR THREAT OF CFIT. A POSSIBLE PREVENTIVE MEASURE WOULD BE TO ISSUE 'DSND VIA THE APPROPRIATE TAR.' THE ALT XING WOULD THEN BE PREPROGRAMMED INTO THE FMC'S.