A BROKEN CONNECTING ROD CAUSED A BE77 PLT TO MAKE AN EMER LNDG. DSM TRACON GAVE HIM THE WRONG CTAF FREQ; SO THE RPTR WAS MET BY AN ACFT ON THE RWY FOR TKOF.

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DES MOINES APCH GAVE ME A WRONG RADIO FREQ WHICH IMPAIRED WARNING OTHER ACFT OF EMER LNDG. WHILE BRAKING TO STOP (AFTER FORCED LNDG) ANOTHER SMALL AIRPLANE TAXIED ONTO THE RWY. HE WAS MOVING AT SLOW RATE AND I WAS ABLE TO BRAKE TO A STOP ESTIMATED 300 FT FROM HIM. I HAD BEEN CRUISING FROM WATERLOO TO DES MOINES AT 6500 FT AND 17 MI NE OF DSM ARPT BEGINNING PWR REDUCTION FOR DSCNT WHEN THERE WAS SUDDEN VIOLENT SHAKING OF THE FRONT OF ACFT AND INST PANEL ACCOMPANIED BY LOSS OF ENG PWR. ANKENY ARPT WAS IN SIGHT CLOSER THAN DES MOINES. I INFORMED DES MOINES APCH OF MY LOSS OF ENG PWR; THAT I WAS DIVERTING TO ANKENY; AND REQUESTED FROM DES MOINES APCH THE RADIO FREQ FOR THE ANKENY CTAF. (I ASKED THEM FOR THE FREQ BECAUSE I WAS BUSY FLYING THE DISABLED PLANE; UNABLE TO MONITOR ALT AND GOING DOWN AT AVERAGE 400-500 FPM.) DSM APCH TOLD ME ANKENY CTAF FREQ WAS 122.9; VECTORED A HWY PATROL ACFT ('TROOPER') TO MY AREA TO OBSERVE; AND THEN ALLOWED ME TO CHANGE TO 122.9. HOWEVER; THEY GAVE ME THE WRONG FREQ. THE ANKENY CTAF IS 122.7. SO MY RADIO CALLS TO ANKENY TFC WENT UNHEARD (EXCEPT BY THE HWY PATROL ACFT THAT ALSO SWITCHED TO 122.9 AS INSTRUCTED BY ATC). IF ATC HAD GIVEN ME THE CORRECT FREQ; THE OTHER ACFT ON THE GND WOULD HAVE HEARD MY CALLS THAT I WAS MAKING AN EMER LNDG; THAT MY ACFT HAD INSUFFICIENT PWR FOR GAR. SKILLS I LEARNED IN MY GLIDER TRAINING WERE INVALUABLE DURING THE FORCED LNDG. MY ACFT LANDED SAFELY ON ANKENY RWY 18. NO DAMAGE TO ANYTHING. CAUSE OF ENG FAILURE RPTED TO ME AS BROKEN CONNECTING ROD BY THE FBO THAT OWNS THE AIRPLANE (A BEECHCRAFT SKIPPER BE77).